diff --git a/Source/Core/Common/BitUtils.h b/Source/Core/Common/BitUtils.h
index 62b9604fab..8b64a92508 100644
--- a/Source/Core/Common/BitUtils.h
+++ b/Source/Core/Common/BitUtils.h
@@ -200,13 +200,55 @@ inline To BitCast(const From& source) noexcept
   return reinterpret_cast<To&>(storage);
 }
 
+template <typename T, typename PtrType>
+class BitCastPtrType
+{
+public:
+  static_assert(std::is_trivially_copyable<PtrType>(),
+                "BitCastPtr source type must be trivially copyable.");
+  static_assert(std::is_trivially_copyable<T>(),
+                "BitCastPtr destination type must be trivially copyable.");
+
+  explicit BitCastPtrType(PtrType* ptr) : m_ptr(ptr) {}
+
+  // Enable operator= only for pointers to non-const data
+  template <typename S>
+  inline typename std::enable_if<std::is_same<S, T>() && !std::is_const<PtrType>()>::type
+  operator=(const S& source)
+  {
+    std::memcpy(m_ptr, &source, sizeof(source));
+  }
+
+  inline operator T() const
+  {
+    T result;
+    std::memcpy(&result, m_ptr, sizeof(result));
+    return result;
+  }
+
+private:
+  PtrType* m_ptr;
+};
+
+// Provides an aliasing-safe alternative to reinterpret_cast'ing pointers to structs
+// Conversion constructor and operator= provided for a convenient syntax.
+// Usage: MyStruct s = BitCastPtr<MyStruct>(some_ptr);
+// BitCastPtr<MyStruct>(some_ptr) = s;
+template <typename T, typename PtrType>
+inline auto BitCastPtr(PtrType* ptr) noexcept -> BitCastPtrType<T, PtrType>
+{
+  return BitCastPtrType<T, PtrType>{ptr};
+}
+
 template <typename T>
 void SetBit(T& value, size_t bit_number, bool bit_value)
 {
+  static_assert(std::is_unsigned<T>(), "SetBit is only sane on unsigned types.");
+
   if (bit_value)
-    value |= (1 << bit_number);
+    value |= (T{1} << bit_number);
   else
-    value &= ~(1 << bit_number);
+    value &= ~(T{1} << bit_number);
 }
 
 }  // namespace Common
diff --git a/Source/Core/Core/HW/WiimoteCommon/DataReport.cpp b/Source/Core/Core/HW/WiimoteCommon/DataReport.cpp
index 47b01d2a65..28f5736153 100644
--- a/Source/Core/Core/HW/WiimoteCommon/DataReport.cpp
+++ b/Source/Core/Core/HW/WiimoteCommon/DataReport.cpp
@@ -4,6 +4,7 @@
 
 #include <cassert>
 
+#include "Common/BitUtils.h"
 #include "Core/HW/WiimoteCommon/DataReport.h"
 
 namespace WiimoteCommon
@@ -34,7 +35,7 @@ struct IncludeCore : virtual DataReportManipulator
 
   void GetCoreData(CoreData* result) const override
   {
-    *result = *reinterpret_cast<const CoreData*>(data_ptr);
+    *result = Common::BitCastPtr<CoreData>(data_ptr);
 
     // Remove accel LSBs.
     result->hex &= CoreData::BUTTON_MASK;
@@ -42,11 +43,13 @@ struct IncludeCore : virtual DataReportManipulator
 
   void SetCoreData(const CoreData& new_core) override
   {
-    auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
 
     // Don't overwrite accel LSBs.
     core.hex &= ~CoreData::BUTTON_MASK;
     core.hex |= new_core.hex & CoreData::BUTTON_MASK;
+
+    Common::BitCastPtr<CoreData>(data_ptr) = core;
   }
 };
 
@@ -71,13 +74,13 @@ struct IncludeAccel : virtual DataReportManipulator
 {
   void GetAccelData(AccelData* result) const override
   {
-    const auto& accel = *reinterpret_cast<AccelMSB*>(data_ptr + 2);
+    const AccelMSB accel = Common::BitCastPtr<AccelMSB>(data_ptr + 2);
     result->x = accel.x << 2;
     result->y = accel.y << 2;
     result->z = accel.z << 2;
 
     // LSBs
-    const auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    const CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
     result->x |= core.acc_bits & 0b11;
     result->y |= (core.acc_bits2 & 0b1) << 1;
     result->z |= core.acc_bits2 & 0b10;
@@ -85,16 +88,18 @@ struct IncludeAccel : virtual DataReportManipulator
 
   void SetAccelData(const AccelData& new_accel) override
   {
-    auto& accel = *reinterpret_cast<AccelMSB*>(data_ptr + 2);
+    AccelMSB accel = {};
     accel.x = new_accel.x >> 2;
     accel.y = new_accel.y >> 2;
     accel.z = new_accel.z >> 2;
+    Common::BitCastPtr<AccelMSB>(data_ptr + 2) = accel;
 
     // LSBs
-    auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
     core.acc_bits = (new_accel.x >> 0) & 0b11;
     core.acc_bits2 = (new_accel.y >> 1) & 0x1;
     core.acc_bits2 |= (new_accel.z & 0xb10);
+    Common::BitCastPtr<CoreData>(data_ptr) = core;
   }
 
   bool HasAccel() const override { return true; }
@@ -196,10 +201,10 @@ struct ReportInterleave1 : IncludeCore, IncludeIR<3, 18, 0>, NoExt
   {
     accel->x = data_ptr[2] << 2;
 
-    // Retain lower 6LSBs.
+    // Retain lower 6 bits.
     accel->z &= 0b111111;
 
-    const auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    const CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
     accel->z |= (core.acc_bits << 6) | (core.acc_bits2 << 8);
   }
 
@@ -207,9 +212,10 @@ struct ReportInterleave1 : IncludeCore, IncludeIR<3, 18, 0>, NoExt
   {
     data_ptr[2] = accel.x >> 2;
 
-    auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
     core.acc_bits = (accel.z >> 6) & 0b11;
     core.acc_bits2 = (accel.z >> 8) & 0b11;
+    Common::BitCastPtr<CoreData>(data_ptr) = core;
   }
 
   bool HasAccel() const override { return true; }
@@ -226,10 +232,10 @@ struct ReportInterleave2 : IncludeCore, IncludeIR<3, 18, 18>, NoExt
   {
     accel->y = data_ptr[2] << 2;
 
-    // Retain upper 4MSBs.
+    // Retain upper 4 bits.
     accel->z &= ~0b111111;
 
-    const auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    const CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
     accel->z |= (core.acc_bits << 2) | (core.acc_bits2 << 4);
   }
 
@@ -237,9 +243,10 @@ struct ReportInterleave2 : IncludeCore, IncludeIR<3, 18, 18>, NoExt
   {
     data_ptr[2] = accel.y >> 2;
 
-    auto& core = *reinterpret_cast<CoreData*>(data_ptr);
+    CoreData core = Common::BitCastPtr<CoreData>(data_ptr);
     core.acc_bits = (accel.z >> 2) & 0b11;
     core.acc_bits2 = (accel.z >> 4) & 0b11;
+    Common::BitCastPtr<CoreData>(data_ptr) = core;
   }
 
   bool HasAccel() const override { return true; }
@@ -257,47 +264,47 @@ std::unique_ptr<DataReportManipulator> MakeDataReportManipulator(InputReportID r
 
   switch (rpt_id)
   {
-  case InputReportID::REPORT_CORE:
+  case InputReportID::ReportCore:
     // 0x30: Core Buttons
     ptr = std::make_unique<ReportCore>();
     break;
-  case InputReportID::REPORT_CORE_ACCEL:
+  case InputReportID::ReportCoreAccel:
     // 0x31: Core Buttons and Accelerometer
     ptr = std::make_unique<ReportCoreAccel>();
     break;
-  case InputReportID::REPORT_CORE_EXT8:
+  case InputReportID::ReportCoreExt8:
     // 0x32: Core Buttons with 8 Extension bytes
     ptr = std::make_unique<ReportCoreExt8>();
     break;
-  case InputReportID::REPORT_CORE_ACCEL_IR12:
+  case InputReportID::ReportCoreAccelIR12:
     // 0x33: Core Buttons and Accelerometer with 12 IR bytes
     ptr = std::make_unique<ReportCoreAccelIR12>();
     break;
-  case InputReportID::REPORT_CORE_EXT19:
+  case InputReportID::ReportCoreExt19:
     // 0x34: Core Buttons with 19 Extension bytes
     ptr = std::make_unique<ReportCoreExt19>();
     break;
-  case InputReportID::REPORT_CORE_ACCEL_EXT16:
+  case InputReportID::ReportCoreAccelExt16:
     // 0x35: Core Buttons and Accelerometer with 16 Extension Bytes
     ptr = std::make_unique<ReportCoreAccelExt16>();
     break;
-  case InputReportID::REPORT_CORE_IR10_EXT9:
+  case InputReportID::ReportCoreIR10Ext9:
     // 0x36: Core Buttons with 10 IR bytes and 9 Extension Bytes
     ptr = std::make_unique<ReportCoreIR10Ext9>();
     break;
-  case InputReportID::REPORT_CORE_ACCEL_IR10_EXT6:
+  case InputReportID::ReportCoreAccelIR10Ext6:
     // 0x37: Core Buttons and Accelerometer with 10 IR bytes and 6 Extension Bytes
     ptr = std::make_unique<ReportCoreAccelIR10Ext6>();
     break;
-  case InputReportID::REPORT_EXT21:
+  case InputReportID::ReportExt21:
     // 0x3d: 21 Extension Bytes
     ptr = std::make_unique<ReportExt21>();
     break;
-  case InputReportID::REPORT_INTERLEAVE1:
+  case InputReportID::ReportInterleave1:
     // 0x3e - 0x3f: Interleaved Core Buttons and Accelerometer with 36 IR bytes
     ptr = std::make_unique<ReportInterleave1>();
     break;
-  case InputReportID::REPORT_INTERLEAVE2:
+  case InputReportID::ReportInterleave2:
     ptr = std::make_unique<ReportInterleave2>();
     break;
   default:
@@ -327,9 +334,8 @@ InputReportID DataReportBuilder::GetMode() const
 
 bool DataReportBuilder::IsValidMode(InputReportID mode)
 {
-  return (mode >= InputReportID::REPORT_CORE &&
-          mode <= InputReportID::REPORT_CORE_ACCEL_IR10_EXT6) ||
-         (mode >= InputReportID::REPORT_EXT21 && InputReportID::REPORT_INTERLEAVE2 <= mode);
+  return (mode >= InputReportID::ReportCore && mode <= InputReportID::ReportCoreAccelIR10Ext6) ||
+         (mode >= InputReportID::ReportExt21 && InputReportID::ReportInterleave2 <= mode);
 }
 
 bool DataReportBuilder::HasCore() const
diff --git a/Source/Core/Core/HW/WiimoteCommon/DataReport.h b/Source/Core/Core/HW/WiimoteCommon/DataReport.h
index f48981677b..dd2833728d 100644
--- a/Source/Core/Core/HW/WiimoteCommon/DataReport.h
+++ b/Source/Core/Core/HW/WiimoteCommon/DataReport.h
@@ -27,7 +27,7 @@ public:
     u16 x, y, z;
   };
 
-  typedef ButtonData CoreData;
+  using CoreData = ButtonData;
 
   virtual bool HasCore() const = 0;
   virtual bool HasAccel() const = 0;
@@ -63,13 +63,10 @@ std::unique_ptr<DataReportManipulator> MakeDataReportManipulator(InputReportID r
 class DataReportBuilder
 {
 public:
-  DataReportBuilder(InputReportID rpt_id);
+  explicit DataReportBuilder(InputReportID rpt_id);
 
-  typedef ButtonData CoreData;
-  typedef DataReportManipulator::AccelData AccelData;
-
-  typedef std::vector<u8> IRData;
-  typedef std::vector<u8> ExtData;
+  using CoreData = ButtonData;
+  using AccelData = DataReportManipulator::AccelData;
 
   void SetMode(InputReportID rpt_id);
   InputReportID GetMode() const;
diff --git a/Source/Core/Core/HW/WiimoteCommon/WiimoteConstants.h b/Source/Core/Core/HW/WiimoteCommon/WiimoteConstants.h
index 7b0e5dc30d..6b57568f9a 100644
--- a/Source/Core/Core/HW/WiimoteCommon/WiimoteConstants.h
+++ b/Source/Core/Core/HW/WiimoteCommon/WiimoteConstants.h
@@ -12,45 +12,45 @@ constexpr u8 MAX_PAYLOAD = 23;
 
 enum class InputReportID : u8
 {
-  STATUS = 0x20,
-  READ_DATA_REPLY = 0x21,
-  ACK = 0x22,
+  Status = 0x20,
+  ReadDataReply = 0x21,
+  Ack = 0x22,
 
   // Not a real value on the wiimote, just a state to disable reports:
-  REPORT_DISABLED = 0x00,
+  ReportDisabled = 0x00,
 
-  REPORT_CORE = 0x30,
-  REPORT_CORE_ACCEL = 0x31,
-  REPORT_CORE_EXT8 = 0x32,
-  REPORT_CORE_ACCEL_IR12 = 0x33,
-  REPORT_CORE_EXT19 = 0x34,
-  REPORT_CORE_ACCEL_EXT16 = 0x35,
-  REPORT_CORE_IR10_EXT9 = 0x36,
-  REPORT_CORE_ACCEL_IR10_EXT6 = 0x37,
+  ReportCore = 0x30,
+  ReportCoreAccel = 0x31,
+  ReportCoreExt8 = 0x32,
+  ReportCoreAccelIR12 = 0x33,
+  ReportCoreExt19 = 0x34,
+  ReportCoreAccelExt16 = 0x35,
+  ReportCoreIR10Ext9 = 0x36,
+  ReportCoreAccelIR10Ext6 = 0x37,
 
-  REPORT_EXT21 = 0x3d,
-  REPORT_INTERLEAVE1 = 0x3e,
-  REPORT_INTERLEAVE2 = 0x3f,
+  ReportExt21 = 0x3d,
+  ReportInterleave1 = 0x3e,
+  ReportInterleave2 = 0x3f,
 };
 
 enum class OutputReportID : u8
 {
-  RUMBLE = 0x10,
-  LEDS = 0x11,
-  REPORT_MODE = 0x12,
-  IR_PIXEL_CLOCK = 0x13,
-  SPEAKER_ENABLE = 0x14,
-  REQUEST_STATUS = 0x15,
-  WRITE_DATA = 0x16,
-  READ_DATA = 0x17,
-  SPEAKER_DATA = 0x18,
-  SPEAKER_MUTE = 0x19,
-  IR_LOGIC = 0x1A,
+  Rumble = 0x10,
+  LED = 0x11,
+  ReportMode = 0x12,
+  IRPixelClock = 0x13,
+  SpeakerEnable = 0x14,
+  RequestStatus = 0x15,
+  WriteData = 0x16,
+  ReadData = 0x17,
+  SpeakerData = 0x18,
+  SpeakerMute = 0x19,
+  IRLogic = 0x1a,
 };
 
 enum class LED : u8
 {
-  NONE = 0x00,
+  None = 0x00,
   LED_1 = 0x10,
   LED_2 = 0x20,
   LED_3 = 0x40,
@@ -63,19 +63,16 @@ enum class AddressSpace : u8
   // However attempting to access this device directly results in an error.
   EEPROM = 0x00,
   // 0x01 is never used but it does function on a real wiimote:
-  I2C_BUS_ALT = 0x01,
-  I2C_BUS = 0x02,
+  I2CBusAlt = 0x01,
+  I2CBus = 0x02,
 };
 
 enum class ErrorCode : u8
 {
-  SUCCESS = 0,
-  INVALID_SPACE = 6,
-  NACK = 7,
-  INVALID_ADDRESS = 8,
-
-  // Not a real value:
-  DO_NOT_SEND_ACK = 0xff,
+  Success = 0,
+  InvalidSpace = 6,
+  Nack = 7,
+  InvalidAddress = 8,
 };
 
 }  // namespace WiimoteCommon
diff --git a/Source/Core/Core/HW/WiimoteCommon/WiimoteHid.h b/Source/Core/Core/HW/WiimoteCommon/WiimoteHid.h
index ccd05a9303..fbcbd8b9e2 100644
--- a/Source/Core/Core/HW/WiimoteCommon/WiimoteHid.h
+++ b/Source/Core/Core/HW/WiimoteCommon/WiimoteHid.h
@@ -54,7 +54,7 @@ struct TypedHIDInputData
 
   T data;
 
-  static_assert(std::is_pod<T>::value);
+  static_assert(std::is_pod<T>());
 
   u8* GetData() { return reinterpret_cast<u8*>(this); }
   const u8* GetData() const { return reinterpret_cast<const u8*>(this); }
diff --git a/Source/Core/Core/HW/WiimoteEmu/Camera.cpp b/Source/Core/Core/HW/WiimoteEmu/Camera.cpp
index 0a8d20c67e..b2807e7122 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Camera.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Camera.cpp
@@ -4,6 +4,7 @@
 
 #include "Core/HW/WiimoteEmu/Camera.h"
 
+#include "Common/BitUtils.h"
 #include "Common/ChunkFile.h"
 #include "Core/HW/WiimoteCommon/WiimoteReport.h"
 #include "Core/HW/WiimoteEmu/MatrixMath.h"
@@ -39,9 +40,6 @@ int CameraLogic::BusWrite(u8 slave_addr, u8 addr, int count, const u8* data_in)
 void CameraLogic::Update(const ControllerEmu::Cursor::StateData& cursor,
                          const NormalizedAccelData& accel, bool sensor_bar_on_top)
 {
-  u16 x[4], y[4];
-  memset(x, 0xFF, sizeof(x));
-
   double nsin, ncos;
 
   // Ugly code to figure out the wiimote's current angle.
@@ -73,7 +71,10 @@ void CameraLogic::Update(const ControllerEmu::Cursor::StateData& cursor,
   static constexpr double dist1 = 100.0 / camWidth;  // this seems the optimal distance for zelda
   static constexpr double dist2 = 1.2 * dist1;
 
-  std::array<Vertex, 4> v;
+  constexpr int NUM_POINTS = 4;
+
+  std::array<Vertex, NUM_POINTS> v;
+
   for (auto& vtx : v)
   {
     vtx.x = cursor.x * (bndright - bndleft) / 2 + (bndleft + bndright) / 2;
@@ -104,6 +105,10 @@ void CameraLogic::Update(const ControllerEmu::Cursor::StateData& cursor,
   MatrixRotationByZ(rot, ir_sin, ir_cos);
   MatrixMultiply(tot, scale, rot);
 
+  u16 x[NUM_POINTS], y[NUM_POINTS];
+  memset(x, 0xFF, sizeof(x));
+  memset(y, 0xFF, sizeof(y));
+
   for (std::size_t i = 0; i < v.size(); i++)
   {
     MatrixTransformVertex(tot, v[i]);
@@ -113,6 +118,12 @@ void CameraLogic::Update(const ControllerEmu::Cursor::StateData& cursor,
 
     x[i] = static_cast<u16>(lround((v[i].x + 1) / 2 * (camWidth - 1)));
     y[i] = static_cast<u16>(lround((v[i].y + 1) / 2 * (camHeight - 1)));
+
+    if (x[i] >= camWidth || y[i] >= camHeight)
+    {
+      x[i] = -1;
+      y[i] = -1;
+    }
   }
 
   // IR data is read from offset 0x37 on real hardware
@@ -127,70 +138,70 @@ void CameraLogic::Update(const ControllerEmu::Cursor::StateData& cursor,
     switch (reg_data.mode)
     {
     case IR_MODE_BASIC:
-    {
-      auto* const irdata = reinterpret_cast<IRBasic*>(data);
       for (unsigned int i = 0; i < 2; ++i)
       {
-        if (x[i * 2] < 1024 && y[i * 2] < 768)
-        {
-          irdata[i].x1 = static_cast<u8>(x[i * 2]);
-          irdata[i].x1hi = x[i * 2] >> 8;
+        IRBasic irdata = {};
 
-          irdata[i].y1 = static_cast<u8>(y[i * 2]);
-          irdata[i].y1hi = y[i * 2] >> 8;
-        }
-        if (x[i * 2 + 1] < 1024 && y[i * 2 + 1] < 768)
-        {
-          irdata[i].x2 = static_cast<u8>(x[i * 2 + 1]);
-          irdata[i].x2hi = x[i * 2 + 1] >> 8;
+        irdata.x1 = static_cast<u8>(x[i * 2]);
+        irdata.x1hi = x[i * 2] >> 8;
+        irdata.y1 = static_cast<u8>(y[i * 2]);
+        irdata.y1hi = y[i * 2] >> 8;
 
-          irdata[i].y2 = static_cast<u8>(y[i * 2 + 1]);
-          irdata[i].y2hi = y[i * 2 + 1] >> 8;
+        irdata.x2 = static_cast<u8>(x[i * 2 + 1]);
+        irdata.x2hi = x[i * 2 + 1] >> 8;
+        irdata.y2 = static_cast<u8>(y[i * 2 + 1]);
+        irdata.y2hi = y[i * 2 + 1] >> 8;
+
+        Common::BitCastPtr<IRBasic>(data + i * sizeof(IRBasic)) = irdata;
+      }
+      break;
+    case IR_MODE_EXTENDED:
+      for (unsigned int i = 0; i < 4; ++i)
+      {
+        if (x[i] < camWidth)
+        {
+          IRExtended irdata = {};
+
+          irdata.x = static_cast<u8>(x[i]);
+          irdata.xhi = x[i] >> 8;
+
+          irdata.y = static_cast<u8>(y[i]);
+          irdata.yhi = y[i] >> 8;
+
+          irdata.size = 10;
+
+          Common::BitCastPtr<IRExtended>(data + i * sizeof(IRExtended)) = irdata;
         }
       }
       break;
-    }
-    case IR_MODE_EXTENDED:
-    {
-      auto* const irdata = reinterpret_cast<IRExtended*>(data);
-      for (unsigned int i = 0; i < 4; ++i)
-        if (x[i] < 1024 && y[i] < 768)
-        {
-          irdata[i].x = static_cast<u8>(x[i]);
-          irdata[i].xhi = x[i] >> 8;
-
-          irdata[i].y = static_cast<u8>(y[i]);
-          irdata[i].yhi = y[i] >> 8;
-
-          irdata[i].size = 10;
-        }
-      break;
-    }
     case IR_MODE_FULL:
-    {
-      auto* const irdata = reinterpret_cast<IRFull*>(data);
       for (unsigned int i = 0; i < 4; ++i)
-        if (x[i] < 1024 && y[i] < 768)
+      {
+        if (x[i] < camWidth)
         {
-          irdata[i].x = static_cast<u8>(x[i]);
-          irdata[i].xhi = x[i] >> 8;
+          IRFull irdata = {};
 
-          irdata[i].y = static_cast<u8>(y[i]);
-          irdata[i].yhi = y[i] >> 8;
+          irdata.x = static_cast<u8>(x[i]);
+          irdata.xhi = x[i] >> 8;
 
-          irdata[i].size = 10;
+          irdata.y = static_cast<u8>(y[i]);
+          irdata.yhi = y[i] >> 8;
+
+          irdata.size = 10;
 
           // TODO: implement these sensibly:
           // TODO: do high bits of x/y min/max need to be set to zero?
-          irdata[i].xmin = 0;
-          irdata[i].ymin = 0;
-          irdata[i].xmax = 0;
-          irdata[i].ymax = 0;
-          irdata[i].zero = 0;
-          irdata[i].intensity = 0;
+          irdata.xmin = 0;
+          irdata.ymin = 0;
+          irdata.xmax = 0;
+          irdata.ymax = 0;
+          irdata.zero = 0;
+          irdata.intensity = 0;
+
+          Common::BitCastPtr<IRFull>(data + i * sizeof(IRFull)) = irdata;
         }
+      }
       break;
-    }
     default:
       // This seems to be fairly common, 0xff data is sent in this case:
       // WARN_LOG(WIIMOTE, "Game is requesting IR data before setting IR mode.");
diff --git a/Source/Core/Core/HW/WiimoteEmu/Camera.h b/Source/Core/Core/HW/WiimoteEmu/Camera.h
index fdcc48858b..b42dddd6b9 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Camera.h
+++ b/Source/Core/Core/HW/WiimoteEmu/Camera.h
@@ -64,6 +64,13 @@ public:
     IR_MODE_FULL = 5,
   };
 
+  void Reset();
+  void DoState(PointerWrap& p);
+  void Update(const ControllerEmu::Cursor::StateData& cursor, const NormalizedAccelData& accel,
+              bool sensor_bar_on_top);
+
+  static constexpr u8 I2C_ADDR = 0x58;
+
 private:
   // TODO: some of this memory is write-only and should return error 7.
 #pragma pack(push, 1)
@@ -85,20 +92,13 @@ private:
   static_assert(0x100 == sizeof(Register));
 
 public:
-  static constexpr u8 I2C_ADDR = 0x58;
-
   // The real wiimote reads camera data from the i2c bus at offset 0x37:
   static const u8 REPORT_DATA_OFFSET = offsetof(Register, camera_data);
 
-  void Reset();
-  void DoState(PointerWrap& p);
-  void Update(const ControllerEmu::Cursor::StateData& cursor, const NormalizedAccelData& accel,
-              bool sensor_bar_on_top);
-
 private:
-  Register reg_data;
-
   int BusRead(u8 slave_addr, u8 addr, int count, u8* data_out) override;
   int BusWrite(u8 slave_addr, u8 addr, int count, const u8* data_in) override;
+
+  Register reg_data;
 };
 }  // namespace WiimoteEmu
diff --git a/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp b/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp
index 47214ea46b..2d954d36d4 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp
@@ -37,7 +37,9 @@ void EmulateShake(NormalizedAccelData* const accel, ControllerEmu::Buttons* cons
       shake_step[i] = (shake_step[i] + 1) % SHAKE_STEP_MAX;
     }
     else
+    {
       shake_step[i] = 0;
+    }
   }
 }
 
diff --git a/Source/Core/Core/HW/WiimoteEmu/Dynamics.h b/Source/Core/Core/HW/WiimoteEmu/Dynamics.h
index 116c03d912..a1258725d1 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Dynamics.h
+++ b/Source/Core/Core/HW/WiimoteEmu/Dynamics.h
@@ -15,11 +15,11 @@ namespace WiimoteEmu
 {
 struct NormalizedAccelData
 {
+  // Unit is 1G
   double x, y, z;
 };
 
-// Used for a dynamic swing or
-// shake
+// Used for a dynamic swing or shake
 struct DynamicData
 {
   std::array<int, 3> timing;                 // Hold length in frames for each axis
@@ -27,10 +27,8 @@ struct DynamicData
   std::array<int, 3> executing_frames_left;  // Number of frames to execute the intensity operation
 };
 
-// Used for a dynamic swing or
-// shake.  This is used to pass
-// in data that defines the dynamic
-// action
+// Used for a dynamic swing or shake.
+// This is used to pass in data that defines the dynamic action
 struct DynamicConfiguration
 {
   double low_intensity;
diff --git a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
index f989d70576..7a47ccf7d2 100644
--- a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
@@ -2,8 +2,10 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <cmath>
 #include <fstream>
 
+#include "Common/BitUtils.h"
 #include "Common/ChunkFile.h"
 #include "Common/CommonTypes.h"
 #include "Common/FileUtil.h"
@@ -43,7 +45,7 @@ void Wiimote::HandleReportMode(const OutputReportMode& dr)
   m_reporting_continuous = dr.continuous;
   m_reporting_mode = dr.mode;
 
-  SendAck(OutputReportID::REPORT_MODE, ErrorCode::SUCCESS);
+  SendAck(OutputReportID::ReportMode, ErrorCode::Success);
 }
 
 // Tests that we have enough bytes for the report before we run the handler.
@@ -53,9 +55,10 @@ void Wiimote::InvokeHandler(H&& handler, const WiimoteCommon::OutputReportGeneri
   if (size < sizeof(T))
   {
     ERROR_LOG(WIIMOTE, "InvokeHandler: report: 0x%02x invalid size: %d", int(rpt.rpt_id), size);
+    return;
   }
 
-  (this->*handler)(*reinterpret_cast<const T*>(rpt.data));
+  (this->*handler)(Common::BitCastPtr<T>(rpt.data));
 }
 
 // Here we process the Output Reports that the Wii sends. Our response will be
@@ -77,7 +80,7 @@ void Wiimote::HIDOutputReport(const void* data, u32 size)
   }
 
   auto& rpt = *static_cast<const OutputReportGeneric*>(data);
-  const int rpt_size = size - rpt.HEADER_SIZE;
+  const int rpt_size = size - OutputReportGeneric::HEADER_SIZE;
 
   DEBUG_LOG(WIIMOTE, "HIDOutputReport (page: %i, cid: 0x%02x, wm: 0x%02x)", m_index,
             m_reporting_channel, int(rpt.rpt_id));
@@ -88,37 +91,37 @@ void Wiimote::HIDOutputReport(const void* data, u32 size)
 
   switch (rpt.rpt_id)
   {
-  case OutputReportID::RUMBLE:
+  case OutputReportID::Rumble:
     // This is handled above.
     break;
-  case OutputReportID::LEDS:
+  case OutputReportID::LED:
     InvokeHandler<OutputReportLeds>(&Wiimote::HandleReportLeds, rpt, rpt_size);
     break;
-  case OutputReportID::REPORT_MODE:
+  case OutputReportID::ReportMode:
     InvokeHandler<OutputReportMode>(&Wiimote::HandleReportMode, rpt, rpt_size);
     break;
-  case OutputReportID::IR_PIXEL_CLOCK:
+  case OutputReportID::IRPixelClock:
     InvokeHandler<OutputReportEnableFeature>(&Wiimote::HandleIRPixelClock, rpt, rpt_size);
     break;
-  case OutputReportID::SPEAKER_ENABLE:
+  case OutputReportID::SpeakerEnable:
     InvokeHandler<OutputReportEnableFeature>(&Wiimote::HandleSpeakerEnable, rpt, rpt_size);
     break;
-  case OutputReportID::REQUEST_STATUS:
+  case OutputReportID::RequestStatus:
     InvokeHandler<OutputReportRequestStatus>(&Wiimote::HandleRequestStatus, rpt, rpt_size);
     break;
-  case OutputReportID::WRITE_DATA:
+  case OutputReportID::WriteData:
     InvokeHandler<OutputReportWriteData>(&Wiimote::HandleWriteData, rpt, rpt_size);
     break;
-  case OutputReportID::READ_DATA:
+  case OutputReportID::ReadData:
     InvokeHandler<OutputReportReadData>(&Wiimote::HandleReadData, rpt, rpt_size);
     break;
-  case OutputReportID::SPEAKER_DATA:
+  case OutputReportID::SpeakerData:
     InvokeHandler<OutputReportSpeakerData>(&Wiimote::HandleSpeakerData, rpt, rpt_size);
     break;
-  case OutputReportID::SPEAKER_MUTE:
+  case OutputReportID::SpeakerMute:
     InvokeHandler<OutputReportEnableFeature>(&Wiimote::HandleSpeakerMute, rpt, rpt_size);
     break;
-  case OutputReportID::IR_LOGIC:
+  case OutputReportID::IRLogic:
     InvokeHandler<OutputReportEnableFeature>(&Wiimote::HandleIRLogic, rpt, rpt_size);
     break;
   default:
@@ -134,7 +137,7 @@ void Wiimote::CallbackInterruptChannel(const u8* data, u32 size)
 
 void Wiimote::SendAck(OutputReportID rpt_id, ErrorCode error_code)
 {
-  TypedHIDInputData<InputReportAck> rpt(InputReportID::ACK);
+  TypedHIDInputData<InputReportAck> rpt(InputReportID::Ack);
   auto& ack = rpt.data;
 
   ack.buttons = m_status.buttons;
@@ -229,7 +232,7 @@ void Wiimote::HandleRequestStatus(const OutputReportRequestStatus&)
   // Max battery level seems to be 0xc8 (decimal 200)
   constexpr u8 MAX_BATTERY_LEVEL = 0xc8;
 
-  m_status.battery = (u8)(m_battery_setting->GetValue() * MAX_BATTERY_LEVEL);
+  m_status.battery = u8(std::lround(m_battery_setting->GetValue() * MAX_BATTERY_LEVEL));
 
   if (Core::WantsDeterminism())
   {
@@ -240,7 +243,7 @@ void Wiimote::HandleRequestStatus(const OutputReportRequestStatus&)
   // Less than 0x20 triggers the low-battery flag:
   m_status.battery_low = m_status.battery < 0x20;
 
-  TypedHIDInputData<InputReportStatus> rpt(InputReportID::STATUS);
+  TypedHIDInputData<InputReportStatus> rpt(InputReportID::Status);
   rpt.data = m_status;
   CallbackInterruptChannel(rpt.GetData(), rpt.GetSize());
 }
@@ -261,7 +264,7 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
     return;
   }
 
-  ErrorCode error_code = ErrorCode::SUCCESS;
+  ErrorCode error_code = ErrorCode::Success;
 
   switch (static_cast<AddressSpace>(wd.space))
   {
@@ -270,7 +273,7 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
     if (address + wd.size > EEPROM_FREE_SIZE)
     {
       WARN_LOG(WIIMOTE, "WriteData: address + size out of bounds!");
-      error_code = ErrorCode::INVALID_ADDRESS;
+      error_code = ErrorCode::InvalidAddress;
     }
     else
     {
@@ -279,7 +282,8 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
       // Write mii data to file
       if (address >= 0x0FCA && address < 0x12C0)
       {
-        // TODO: Only write parts of the Mii block
+        // TODO: Only write parts of the Mii block.
+        // TODO: Use fifferent files for different wiimote numbers.
         std::ofstream file;
         File::OpenFStream(file, File::GetUserPath(D_SESSION_WIIROOT_IDX) + "/mii.bin",
                           std::ios::binary | std::ios::out);
@@ -290,14 +294,14 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
   }
   break;
 
-  case AddressSpace::I2C_BUS:
-  case AddressSpace::I2C_BUS_ALT:
+  case AddressSpace::I2CBus:
+  case AddressSpace::I2CBusAlt:
   {
     // Attempting to access the EEPROM directly over i2c results in error 8.
     if (EEPROM_I2C_ADDR == m_read_request.slave_address)
     {
       WARN_LOG(WIIMOTE, "Attempt to write EEPROM directly.");
-      error_code = ErrorCode::INVALID_ADDRESS;
+      error_code = ErrorCode::InvalidAddress;
       break;
     }
 
@@ -306,7 +310,7 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
     if (bytes_written != wd.size)
     {
       // A real wiimote gives error 7 for failed write to i2c bus (mainly a non-existant slave)
-      error_code = ErrorCode::NACK;
+      error_code = ErrorCode::Nack;
     }
   }
   break;
@@ -314,11 +318,11 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
   default:
     WARN_LOG(WIIMOTE, "WriteData: invalid address space: 0x%x", wd.space);
     // A real wiimote gives error 6:
-    error_code = ErrorCode::INVALID_SPACE;
+    error_code = ErrorCode::InvalidSpace;
     break;
   }
 
-  SendAck(OutputReportID::WRITE_DATA, error_code);
+  SendAck(OutputReportID::WriteData, error_code);
 }
 
 void Wiimote::HandleReportRumble(const WiimoteCommon::OutputReportRumble& rpt)
@@ -333,7 +337,7 @@ void Wiimote::HandleReportLeds(const WiimoteCommon::OutputReportLeds& rpt)
   m_status.leds = rpt.leds;
 
   if (rpt.ack)
-    SendAck(OutputReportID::LEDS, ErrorCode::SUCCESS);
+    SendAck(OutputReportID::LED, ErrorCode::Success);
 }
 
 void Wiimote::HandleIRPixelClock(const WiimoteCommon::OutputReportEnableFeature& rpt)
@@ -343,7 +347,7 @@ void Wiimote::HandleIRPixelClock(const WiimoteCommon::OutputReportEnableFeature&
   // FYI: Camera data is currently always updated. Ignoring pixel clock status.
 
   if (rpt.ack)
-    SendAck(OutputReportID::IR_PIXEL_CLOCK, ErrorCode::SUCCESS);
+    SendAck(OutputReportID::IRPixelClock, ErrorCode::Success);
 }
 
 void Wiimote::HandleIRLogic(const WiimoteCommon::OutputReportEnableFeature& rpt)
@@ -353,7 +357,7 @@ void Wiimote::HandleIRLogic(const WiimoteCommon::OutputReportEnableFeature& rpt)
   m_status.ir = rpt.enable;
 
   if (rpt.ack)
-    SendAck(OutputReportID::IR_LOGIC, ErrorCode::SUCCESS);
+    SendAck(OutputReportID::IRLogic, ErrorCode::Success);
 }
 
 void Wiimote::HandleSpeakerMute(const WiimoteCommon::OutputReportEnableFeature& rpt)
@@ -361,7 +365,7 @@ void Wiimote::HandleSpeakerMute(const WiimoteCommon::OutputReportEnableFeature&
   m_speaker_mute = rpt.enable;
 
   if (rpt.ack)
-    SendAck(OutputReportID::SPEAKER_MUTE, ErrorCode::SUCCESS);
+    SendAck(OutputReportID::SpeakerMute, ErrorCode::Success);
 }
 
 void Wiimote::HandleSpeakerEnable(const WiimoteCommon::OutputReportEnableFeature& rpt)
@@ -370,7 +374,7 @@ void Wiimote::HandleSpeakerEnable(const WiimoteCommon::OutputReportEnableFeature
   m_status.speaker = rpt.enable;
 
   if (rpt.ack)
-    SendAck(OutputReportID::SPEAKER_ENABLE, ErrorCode::SUCCESS);
+    SendAck(OutputReportID::SpeakerEnable, ErrorCode::Success);
 }
 
 void Wiimote::HandleSpeakerData(const WiimoteCommon::OutputReportSpeakerData& rpt)
@@ -437,7 +441,7 @@ bool Wiimote::ProcessReadDataRequest()
     return false;
   }
 
-  TypedHIDInputData<InputReportReadDataReply> rpt(InputReportID::READ_DATA_REPLY);
+  TypedHIDInputData<InputReportReadDataReply> rpt(InputReportID::ReadDataReply);
   auto& reply = rpt.data;
 
   reply.buttons = m_status.buttons;
@@ -446,7 +450,7 @@ bool Wiimote::ProcessReadDataRequest()
   // Pre-fill with zeros in case of read-error or read < 16-bytes:
   std::fill(std::begin(reply.data), std::end(reply.data), 0x00);
 
-  ErrorCode error_code = ErrorCode::SUCCESS;
+  ErrorCode error_code = ErrorCode::Success;
 
   switch (m_read_request.space)
   {
@@ -460,7 +464,7 @@ bool Wiimote::ProcessReadDataRequest()
       // The real Wiimote generate an error for the first
       // request to 0x1770 if we dont't replicate that the game will never
       // read the calibration data at the beginning of Eeprom.
-      error_code = ErrorCode::INVALID_ADDRESS;
+      error_code = ErrorCode::InvalidAddress;
     }
     else
     {
@@ -483,14 +487,14 @@ bool Wiimote::ProcessReadDataRequest()
   }
   break;
 
-  case AddressSpace::I2C_BUS:
-  case AddressSpace::I2C_BUS_ALT:
+  case AddressSpace::I2CBus:
+  case AddressSpace::I2CBusAlt:
   {
     // Attempting to access the EEPROM directly over i2c results in error 8.
     if (EEPROM_I2C_ADDR == m_read_request.slave_address)
     {
       WARN_LOG(WIIMOTE, "Attempt to read EEPROM directly.");
-      error_code = ErrorCode::INVALID_ADDRESS;
+      error_code = ErrorCode::InvalidAddress;
       break;
     }
 
@@ -502,7 +506,7 @@ bool Wiimote::ProcessReadDataRequest()
     {
       DEBUG_LOG(WIIMOTE, "Responding with read error 7 @ 0x%x @ 0x%x (%d)",
                 m_read_request.slave_address, m_read_request.address, m_read_request.size);
-      error_code = ErrorCode::NACK;
+      error_code = ErrorCode::Nack;
       break;
     }
 
@@ -513,11 +517,11 @@ bool Wiimote::ProcessReadDataRequest()
   default:
     WARN_LOG(WIIMOTE, "ReadData: invalid address space: 0x%x", int(m_read_request.space));
     // A real wiimote gives error 6:
-    error_code = ErrorCode::INVALID_SPACE;
+    error_code = ErrorCode::InvalidSpace;
     break;
   }
 
-  if (ErrorCode::SUCCESS != error_code)
+  if (ErrorCode::Success != error_code)
   {
     // Stop processing request on read error:
     m_read_request.size = 0;
diff --git a/Source/Core/Core/HW/WiimoteEmu/Extension/Classic.cpp b/Source/Core/Core/HW/WiimoteEmu/Extension/Classic.cpp
index aa6b7e9ccd..9d1e656b85 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Extension/Classic.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Extension/Classic.cpp
@@ -7,6 +7,7 @@
 #include <array>
 #include <cassert>
 
+#include "Common/BitUtils.h"
 #include "Common/Common.h"
 #include "Common/CommonTypes.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
@@ -108,8 +109,7 @@ Classic::Classic() : EncryptedExtension(_trans("Classic"))
 
 void Classic::Update()
 {
-  auto& classic_data = *reinterpret_cast<DataFormat*>(&m_reg.controller_data);
-  classic_data = {};
+  DataFormat classic_data = {};
 
   // left stick
   {
@@ -156,6 +156,8 @@ void Classic::Update()
 
   // flip button bits
   classic_data.bt.hex ^= 0xFFFF;
+
+  Common::BitCastPtr<DataFormat>(&m_reg.controller_data) = classic_data;
 }
 
 bool Classic::IsButtonPressed() const
diff --git a/Source/Core/Core/HW/WiimoteEmu/Extension/Drums.cpp b/Source/Core/Core/HW/WiimoteEmu/Extension/Drums.cpp
index 976038711c..1e98529209 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Extension/Drums.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Extension/Drums.cpp
@@ -8,6 +8,7 @@
 #include <cassert>
 #include <cstring>
 
+#include "Common/BitUtils.h"
 #include "Common/Common.h"
 #include "Common/CommonTypes.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
@@ -66,8 +67,7 @@ Drums::Drums() : EncryptedExtension(_trans("Drums"))
 
 void Drums::Update()
 {
-  auto& drum_data = reinterpret_cast<DataFormat&>(m_reg.controller_data);
-  drum_data = {};
+  DataFormat drum_data = {};
 
   // stick
   {
@@ -92,6 +92,8 @@ void Drums::Update()
 
   // flip button bits
   drum_data.bt ^= 0xFFFF;
+
+  Common::BitCastPtr<DataFormat>(&m_reg.controller_data) = drum_data;
 }
 
 bool Drums::IsButtonPressed() const
diff --git a/Source/Core/Core/HW/WiimoteEmu/Extension/Extension.h b/Source/Core/Core/HW/WiimoteEmu/Extension/Extension.h
index b32b1367bd..6392d9d542 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Extension/Extension.h
+++ b/Source/Core/Core/HW/WiimoteEmu/Extension/Extension.h
@@ -20,7 +20,7 @@ namespace WiimoteEmu
 class Extension : public ControllerEmu::EmulatedController, public I2CSlave
 {
 public:
-  Extension(const char* name);
+  explicit Extension(const char* name);
 
   std::string GetName() const override;
 
diff --git a/Source/Core/Core/HW/WiimoteEmu/Extension/Guitar.cpp b/Source/Core/Core/HW/WiimoteEmu/Extension/Guitar.cpp
index b3d5ab286b..68454928ce 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Extension/Guitar.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Extension/Guitar.cpp
@@ -9,6 +9,7 @@
 #include <cstring>
 #include <map>
 
+#include "Common/BitUtils.h"
 #include "Common/Common.h"
 #include "Common/CommonTypes.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
@@ -98,8 +99,7 @@ Guitar::Guitar() : EncryptedExtension(_trans("Guitar"))
 
 void Guitar::Update()
 {
-  auto& guitar_data = reinterpret_cast<DataFormat&>(m_reg.controller_data);
-  guitar_data = {};
+  DataFormat guitar_data = {};
 
   // stick
   {
@@ -137,6 +137,8 @@ void Guitar::Update()
 
   // flip button bits
   guitar_data.bt ^= 0xFFFF;
+
+  Common::BitCastPtr<DataFormat>(&m_reg.controller_data) = guitar_data;
 }
 
 bool Guitar::IsButtonPressed() const
diff --git a/Source/Core/Core/HW/WiimoteEmu/Extension/Nunchuk.cpp b/Source/Core/Core/HW/WiimoteEmu/Extension/Nunchuk.cpp
index 91dd8bf176..184ed25fc7 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Extension/Nunchuk.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Extension/Nunchuk.cpp
@@ -8,6 +8,7 @@
 #include <cassert>
 #include <cstring>
 
+#include "Common/BitUtils.h"
 #include "Common/Common.h"
 #include "Common/CommonTypes.h"
 #include "Common/MathUtil.h"
@@ -72,8 +73,7 @@ Nunchuk::Nunchuk() : EncryptedExtension(_trans("Nunchuk"))
 
 void Nunchuk::Update()
 {
-  auto& nc_data = *reinterpret_cast<DataFormat*>(&m_reg.controller_data);
-  nc_data = {};
+  DataFormat nc_data = {};
 
   // stick
   const ControllerEmu::AnalogStick::StateData stick_state = m_stick->GetState();
@@ -129,6 +129,8 @@ void Nunchuk::Update()
   nc_data.bt.acc_x_lsb = acc.x & 0x3;
   nc_data.bt.acc_y_lsb = acc.y & 0x3;
   nc_data.bt.acc_z_lsb = acc.z & 0x3;
+
+  Common::BitCastPtr<DataFormat>(&m_reg.controller_data) = nc_data;
 }
 
 bool Nunchuk::IsButtonPressed() const
diff --git a/Source/Core/Core/HW/WiimoteEmu/Extension/Turntable.cpp b/Source/Core/Core/HW/WiimoteEmu/Extension/Turntable.cpp
index 2871a73339..30964b91e9 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Extension/Turntable.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Extension/Turntable.cpp
@@ -8,6 +8,7 @@
 #include <cassert>
 #include <cstring>
 
+#include "Common/BitUtils.h"
 #include "Common/Common.h"
 #include "Common/CommonTypes.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
@@ -84,8 +85,7 @@ Turntable::Turntable() : EncryptedExtension(_trans("Turntable"))
 
 void Turntable::Update()
 {
-  auto& tt_data = reinterpret_cast<DataFormat&>(m_reg.controller_data);
-  tt_data = {};
+  DataFormat tt_data = {};
 
   // stick
   {
@@ -137,6 +137,8 @@ void Turntable::Update()
   // flip button bits :/
   tt_data.bt ^= (BUTTON_L_GREEN | BUTTON_L_RED | BUTTON_L_BLUE | BUTTON_R_GREEN | BUTTON_R_RED |
                  BUTTON_R_BLUE | BUTTON_MINUS | BUTTON_PLUS | BUTTON_EUPHORIA);
+
+  Common::BitCastPtr<DataFormat>(&m_reg.controller_data) = tt_data;
 }
 
 bool Turntable::IsButtonPressed() const
diff --git a/Source/Core/Core/HW/WiimoteEmu/ExtensionPort.h b/Source/Core/Core/HW/WiimoteEmu/ExtensionPort.h
index 13dcc0025d..42640b6edb 100644
--- a/Source/Core/Core/HW/WiimoteEmu/ExtensionPort.h
+++ b/Source/Core/Core/HW/WiimoteEmu/ExtensionPort.h
@@ -30,7 +30,7 @@ public:
   static constexpr u8 REPORT_I2C_SLAVE = 0x52;
   static constexpr u8 REPORT_I2C_ADDR = 0x00;
 
-  ExtensionPort(I2CBus* i2c_bus);
+  explicit ExtensionPort(I2CBus* i2c_bus);
 
   bool IsDeviceConnected() const;
   void AttachExtension(Extension* dev);
diff --git a/Source/Core/Core/HW/WiimoteEmu/MotionPlus.cpp b/Source/Core/Core/HW/WiimoteEmu/MotionPlus.cpp
index 6c3787a83e..faa4a90ff2 100644
--- a/Source/Core/Core/HW/WiimoteEmu/MotionPlus.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/MotionPlus.cpp
@@ -25,7 +25,7 @@ void MotionPlus::Reset()
   std::copy(std::begin(initial_id), std::end(initial_id), reg_data.ext_identifier);
 
   // TODO: determine meaning of calibration data:
-  static const u8 cdata[32] = {
+  constexpr std::array<u8, 32> cdata = {
       0x78, 0xd9, 0x78, 0x38, 0x77, 0x9d, 0x2f, 0x0c, 0xcf, 0xf0, 0x31,
       0xad, 0xc8, 0x0b, 0x5e, 0x39, 0x6f, 0x81, 0x7b, 0x89, 0x78, 0x51,
       0x33, 0x60, 0xc9, 0xf5, 0x37, 0xc1, 0x2d, 0xe9, 0x15, 0x8d,
@@ -34,7 +34,7 @@ void MotionPlus::Reset()
   std::copy(std::begin(cdata), std::end(cdata), reg_data.calibration_data);
 
   // TODO: determine the meaning behind this:
-  static const u8 cert[64] = {
+  constexpr std::array<u8, 64> cert = {
       0x99, 0x1a, 0x07, 0x1b, 0x97, 0xf1, 0x11, 0x78, 0x0c, 0x42, 0x2b, 0x68, 0xdf,
       0x44, 0x38, 0x0d, 0x2b, 0x7e, 0xd6, 0x84, 0x84, 0x58, 0x65, 0xc9, 0xf2, 0x95,
       0xd9, 0xaf, 0xb6, 0xc4, 0x87, 0xd5, 0x18, 0xdb, 0x67, 0x3a, 0xc0, 0x71, 0xec,
@@ -52,7 +52,7 @@ void MotionPlus::DoState(PointerWrap& p)
 
 bool MotionPlus::IsActive() const
 {
-  return ACTIVE_DEVICE_ADDR << 1 == reg_data.ext_identifier[2];
+  return (ACTIVE_DEVICE_ADDR << 1) == reg_data.ext_identifier[2];
 }
 
 MotionPlus::PassthroughMode MotionPlus::GetPassthroughMode() const
@@ -69,7 +69,8 @@ int MotionPlus::BusRead(u8 slave_addr, u8 addr, int count, u8* data_out)
 {
   if (IsActive())
   {
-    // Motion plus does not respond to 0x53 when activated
+    // FYI: Motion plus does not respond to 0x53 when activated
+
     if (ACTIVE_DEVICE_ADDR == slave_addr)
       return RawRead(&reg_data, addr, count, data_out);
     else
@@ -78,7 +79,9 @@ int MotionPlus::BusRead(u8 slave_addr, u8 addr, int count, u8* data_out)
   else
   {
     if (INACTIVE_DEVICE_ADDR == slave_addr)
+    {
       return RawRead(&reg_data, addr, count, data_out);
+    }
     else
     {
       // Passthrough to the connected extension (if any)
@@ -200,7 +203,7 @@ void MotionPlus::Update()
     // It even works when removing the is_mp_data bit in the last byte
     // My M+ non-inside gives: 61,46,45,aa,0,2 or b6,46,45,9a,0,2
     // static const u8 init_data[6] = {0x8e, 0xb0, 0x4f, 0x5a, 0xfc | 0x01, 0x02};
-    static const u8 init_data[6] = {0x81, 0x46, 0x46, 0xb6, 0x01, 0x02};
+    constexpr std::array<u8, 6> init_data = {0x81, 0x46, 0x46, 0xb6, 0x01, 0x02};
     std::copy(std::begin(init_data), std::end(init_data), data);
     reg_data.cert_ready = 0x2;
     return;
@@ -208,7 +211,7 @@ void MotionPlus::Update()
 
   if (0x2 == reg_data.cert_ready)
   {
-    static const u8 init_data[6] = {0x7f, 0xcf, 0xdf, 0x8b, 0x4f, 0x82};
+    constexpr std::array<u8, 6> init_data = {0x7f, 0xcf, 0xdf, 0x8b, 0x4f, 0x82};
     std::copy(std::begin(init_data), std::end(init_data), data);
     reg_data.cert_ready = 0x8;
     return;
@@ -223,7 +226,7 @@ void MotionPlus::Update()
   if (0x18 == reg_data.cert_ready)
   {
     // TODO: determine the meaning of this
-    const u8 mp_cert2[64] = {
+    constexpr std::array<u8, 64> mp_cert2 = {
         0xa5, 0x84, 0x1f, 0xd6, 0xbd, 0xdc, 0x7a, 0x4c, 0xf3, 0xc0, 0x24, 0xe0, 0x92,
         0xef, 0x19, 0x28, 0x65, 0xe0, 0x62, 0x7c, 0x9b, 0x41, 0x6f, 0x12, 0xc3, 0xac,
         0x78, 0xe4, 0xfc, 0x6b, 0x7b, 0x0a, 0xb4, 0x50, 0xd6, 0xf2, 0x45, 0xf7, 0x93,
@@ -267,7 +270,7 @@ void MotionPlus::Update()
   constexpr u8 EXT_ADDR = ExtensionPort::REPORT_I2C_ADDR;
 
   // Try to alternate between M+ and EXT data:
-  auto& mplus_data = *reinterpret_cast<DataFormat*>(data);
+  DataFormat mplus_data = Common::BitCastPtr<DataFormat>(data);
   mplus_data.is_mp_data ^= true;
 
   // hax!!!
@@ -282,13 +285,13 @@ void MotionPlus::Update()
   {
     switch (GetPassthroughMode())
     {
-    case PassthroughMode::DISABLED:
+    case PassthroughMode::Disabled:
     {
       // Passthrough disabled, always send M+ data:
       mplus_data.is_mp_data = true;
       break;
     }
-    case PassthroughMode::NUNCHUK:
+    case PassthroughMode::Nunchuk:
     {
       if (EXT_AMT == i2c_bus.BusRead(EXT_SLAVE, EXT_ADDR, EXT_AMT, data))
       {
@@ -315,7 +318,7 @@ void MotionPlus::Update()
       }
       break;
     }
-    case PassthroughMode::CLASSIC:
+    case PassthroughMode::Classic:
     {
       if (EXT_AMT == i2c_bus.BusRead(EXT_SLAVE, EXT_ADDR, EXT_AMT, data))
       {
@@ -371,6 +374,8 @@ void MotionPlus::Update()
 
   mplus_data.extension_connected = m_extension_port.IsDeviceConnected();
   mplus_data.zero = 0;
+
+  Common::BitCastPtr<DataFormat>(data) = mplus_data;
 }
 
 }  // namespace WiimoteEmu
diff --git a/Source/Core/Core/HW/WiimoteEmu/MotionPlus.h b/Source/Core/Core/HW/WiimoteEmu/MotionPlus.h
index 211e666153..06bc21b441 100644
--- a/Source/Core/Core/HW/WiimoteEmu/MotionPlus.h
+++ b/Source/Core/Core/HW/WiimoteEmu/MotionPlus.h
@@ -96,9 +96,9 @@ private:
 
   enum class PassthroughMode : u8
   {
-    DISABLED = 0x04,
-    NUNCHUK = 0x05,
-    CLASSIC = 0x07,
+    Disabled = 0x04,
+    Nunchuk = 0x05,
+    Classic = 0x07,
   };
 
   bool IsActive() const;
diff --git a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
index cd2b10347c..b99b577265 100644
--- a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
@@ -71,7 +71,7 @@ void Wiimote::Reset()
 
   // Wiimote starts in non-continuous CORE mode:
   m_reporting_channel = 0;
-  m_reporting_mode = InputReportID::REPORT_CORE;
+  m_reporting_mode = InputReportID::ReportCore;
   m_reporting_continuous = false;
 
   m_speaker_mute = false;
@@ -325,7 +325,7 @@ bool Wiimote::ProcessExtensionPortEvent()
     return false;
 
   // FYI: This happens even during a read request which continues after the status report is sent.
-  m_reporting_mode = InputReportID::REPORT_DISABLED;
+  m_reporting_mode = InputReportID::ReportDisabled;
 
   DEBUG_LOG(WIIMOTE, "Sending status report due to extension status change.");
 
@@ -382,14 +382,14 @@ void Wiimote::SendDataReport()
 {
   Movie::SetPolledDevice();
 
-  if (InputReportID::REPORT_DISABLED == m_reporting_mode)
+  if (InputReportID::ReportDisabled == m_reporting_mode)
   {
     // The wiimote is in this disabled after an extension change.
     // Input reports are not sent, even on button change.
     return;
   }
 
-  if (InputReportID::REPORT_CORE == m_reporting_mode && !m_reporting_continuous)
+  if (InputReportID::ReportCore == m_reporting_mode && !m_reporting_continuous)
   {
     // TODO: we only need to send a report if the data changed when m_reporting_continuous is
     // disabled. It's probably only sensible to check this with REPORT_CORE
@@ -497,10 +497,10 @@ void Wiimote::SendDataReport()
   CallbackInterruptChannel(rpt_builder.GetDataPtr(), rpt_builder.GetDataSize());
 
   // The interleaved reporting modes toggle back and forth:
-  if (InputReportID::REPORT_INTERLEAVE1 == m_reporting_mode)
-    m_reporting_mode = InputReportID::REPORT_INTERLEAVE2;
-  else if (InputReportID::REPORT_INTERLEAVE2 == m_reporting_mode)
-    m_reporting_mode = InputReportID::REPORT_INTERLEAVE1;
+  if (InputReportID::ReportInterleave1 == m_reporting_mode)
+    m_reporting_mode = InputReportID::ReportInterleave2;
+  else if (InputReportID::ReportInterleave2 == m_reporting_mode)
+    m_reporting_mode = InputReportID::ReportInterleave1;
 }
 
 void Wiimote::ControlChannel(const u16 channel_id, const void* data, u32 size)
@@ -550,7 +550,7 @@ void Wiimote::ControlChannel(const u16 channel_id, const void* data, u32 size)
     {
       // AyuanX: My experiment shows Control Channel is never used
       // shuffle2: but lwbt uses this, so we'll do what we must :)
-      HIDOutputReport(hidp.data, size - hidp.HEADER_SIZE);
+      HIDOutputReport(hidp.data, size - HIDPacket::HEADER_SIZE);
 
       // TODO: Should this be above the previous?
       u8 handshake = HID_HANDSHAKE_SUCCESS;
@@ -594,7 +594,7 @@ void Wiimote::InterruptChannel(const u16 channel_id, const void* data, u32 size)
     switch (hidp.param)
     {
     case HID_PARAM_OUTPUT:
-      HIDOutputReport(hidp.data, size - hidp.HEADER_SIZE);
+      HIDOutputReport(hidp.data, size - HIDPacket::HEADER_SIZE);
       break;
 
     default:
diff --git a/Source/Core/Core/HW/WiimoteReal/IOWin.cpp b/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
index a5f9b569ad..8f6c69c448 100644
--- a/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
@@ -449,7 +449,7 @@ bool IsWiimote(const std::basic_string<TCHAR>& device_path, WinWriteMethod& meth
   Common::ScopeGuard handle_guard{[&dev_handle] { CloseHandle(dev_handle); }};
 
   u8 buf[MAX_PAYLOAD];
-  u8 const req_status_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::REQUEST_STATUS), 0};
+  u8 const req_status_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::RequestStatus), 0};
   int invalid_report_count = 0;
   int rc = WriteToHandle(dev_handle, method, req_status_report, sizeof(req_status_report));
   while (rc > 0)
@@ -460,7 +460,7 @@ bool IsWiimote(const std::basic_string<TCHAR>& device_path, WinWriteMethod& meth
 
     switch (InputReportID(buf[1]))
     {
-    case InputReportID::STATUS:
+    case InputReportID::Status:
       return true;
     default:
       WARN_LOG(WIIMOTE, "IsWiimote(): Received unexpected report %02x", buf[1]);
@@ -703,11 +703,11 @@ size_t GetReportSize(u8 rid)
 
   switch (report_id)
   {
-  case InputReportID::STATUS:
+  case InputReportID::Status:
     return sizeof(InputReportStatus);
-  case InputReportID::READ_DATA_REPLY:
+  case InputReportID::ReadDataReply:
     return sizeof(InputReportReadDataReply);
-  case InputReportID::ACK:
+  case InputReportID::Ack:
     return sizeof(InputReportAck);
   default:
     if (DataReportBuilder::IsValidMode(report_id))
diff --git a/Source/Core/Core/HW/WiimoteReal/IOhidapi.cpp b/Source/Core/Core/HW/WiimoteReal/IOhidapi.cpp
index 2d5a89672c..e2abdafa80 100644
--- a/Source/Core/Core/HW/WiimoteReal/IOhidapi.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/IOhidapi.cpp
@@ -27,7 +27,7 @@ static bool IsDeviceUsable(const std::string& device_path)
   // Some third-party adapters (DolphinBar) always expose all four Wii Remotes as HIDs
   // even when they are not connected, which causes an endless error loop when we try to use them.
   // Try to write a report to the device to see if this Wii Remote is really usable.
-  static const u8 report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::REQUEST_STATUS), 0};
+  static const u8 report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::RequestStatus), 0};
   const int result = hid_write(handle, report, sizeof(report));
   // The DolphinBar uses EPIPE to signal the absence of a Wii Remote connected to this HID.
   if (result == -1 && errno != EPIPE)
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
index e930a2b547..b7dab2fefe 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
@@ -71,7 +71,7 @@ void Wiimote::WriteReport(Report rpt)
     bool const new_rumble_state = (rpt[2] & 0x1) != 0;
 
     // If this is a rumble report and the rumble state didn't change, ignore.
-    if (rpt[1] == u8(OutputReportID::RUMBLE) && new_rumble_state == m_rumble_state)
+    if (rpt[1] == u8(OutputReportID::Rumble) && new_rumble_state == m_rumble_state)
       return;
 
     m_rumble_state = new_rumble_state;
@@ -99,10 +99,10 @@ void Wiimote::DisableDataReporting()
 
   // This accomplishes very little:
   OutputReportMode rpt = {};
-  rpt.mode = InputReportID::REPORT_CORE;
+  rpt.mode = InputReportID::ReportCore;
   rpt.continuous = 0;
   rpt.rumble = 0;
-  QueueReport(u8(OutputReportID::REPORT_MODE), &rpt, sizeof(rpt));
+  QueueReport(u8(OutputReportID::ReportMode), &rpt, sizeof(rpt));
 }
 
 void Wiimote::EnableDataReporting(u8 mode)
@@ -112,7 +112,7 @@ void Wiimote::EnableDataReporting(u8 mode)
   OutputReportMode rpt = {};
   rpt.mode = InputReportID(mode);
   rpt.continuous = 1;
-  QueueReport(u8(OutputReportID::REPORT_MODE), &rpt, sizeof(rpt));
+  QueueReport(u8(OutputReportID::ReportMode), &rpt, sizeof(rpt));
 }
 
 void Wiimote::SetChannel(u16 channel)
@@ -177,7 +177,7 @@ void Wiimote::InterruptChannel(const u16 channel, const void* const data, const
 
   // Disallow games from turning off all of the LEDs.
   // It makes Wiimote connection status confusing.
-  if (rpt[1] == u8(OutputReportID::LEDS))
+  if (rpt[1] == u8(OutputReportID::LED))
   {
     auto& leds_rpt = *reinterpret_cast<OutputReportLeds*>(&rpt[2]);
     if (0 == leds_rpt.leds)
@@ -186,12 +186,12 @@ void Wiimote::InterruptChannel(const u16 channel, const void* const data, const
       leds_rpt.leds = 0xf;
     }
   }
-  else if (rpt[1] == u8(OutputReportID::SPEAKER_DATA) &&
+  else if (rpt[1] == u8(OutputReportID::SpeakerData) &&
            (!SConfig::GetInstance().m_WiimoteEnableSpeaker ||
             (!wm->m_status.speaker || wm->m_speaker_mute)))
   {
     // Translate speaker data reports into rumble reports.
-    rpt[1] = u8(OutputReportID::RUMBLE);
+    rpt[1] = u8(OutputReportID::Rumble);
     // Keep only the rumble bit.
     rpt[2] &= 0x1;
     rpt.resize(3);
@@ -255,23 +255,11 @@ bool Wiimote::IsBalanceBoard()
     return false;
   // Initialise the extension by writing 0x55 to 0xa400f0, then writing 0x00 to 0xa400fb.
   // TODO: Use the structs for building these reports..
-  static const u8 init_extension_rpt1[MAX_PAYLOAD] = {WR_SET_REPORT | BT_OUTPUT,
-                                                      u8(OutputReportID::WRITE_DATA),
-                                                      0x04,
-                                                      0xa4,
-                                                      0x00,
-                                                      0xf0,
-                                                      0x01,
-                                                      0x55};
-  static const u8 init_extension_rpt2[MAX_PAYLOAD] = {WR_SET_REPORT | BT_OUTPUT,
-                                                      u8(OutputReportID::WRITE_DATA),
-                                                      0x04,
-                                                      0xa4,
-                                                      0x00,
-                                                      0xfb,
-                                                      0x01,
-                                                      0x00};
-  static const u8 status_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::REQUEST_STATUS),
+  static const u8 init_extension_rpt1[MAX_PAYLOAD] = {
+      WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::WriteData), 0x04, 0xa4, 0x00, 0xf0, 0x01, 0x55};
+  static const u8 init_extension_rpt2[MAX_PAYLOAD] = {
+      WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::WriteData), 0x04, 0xa4, 0x00, 0xfb, 0x01, 0x00};
+  static const u8 status_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::RequestStatus),
                                      0};
   if (!IOWrite(init_extension_rpt1, sizeof(init_extension_rpt1)) ||
       !IOWrite(init_extension_rpt2, sizeof(init_extension_rpt2)))
@@ -290,7 +278,7 @@ bool Wiimote::IsBalanceBoard()
 
     switch (InputReportID(buf[1]))
     {
-    case InputReportID::STATUS:
+    case InputReportID::Status:
     {
       const auto* status = reinterpret_cast<InputReportStatus*>(&buf[2]);
       // A Balance Board has a Balance Board extension.
@@ -298,7 +286,7 @@ bool Wiimote::IsBalanceBoard()
         return false;
       // Read two bytes from 0xa400fe to identify the extension.
       static const u8 identify_ext_rpt[] = {WR_SET_REPORT | BT_OUTPUT,
-                                            u8(OutputReportID::READ_DATA),
+                                            u8(OutputReportID::ReadData),
                                             0x04,
                                             0xa4,
                                             0x00,
@@ -308,7 +296,7 @@ bool Wiimote::IsBalanceBoard()
       ret = IOWrite(identify_ext_rpt, sizeof(identify_ext_rpt));
       break;
     }
-    case InputReportID::READ_DATA_REPLY:
+    case InputReportID::ReadDataReply:
     {
       const auto* reply = reinterpret_cast<InputReportReadDataReply*>(&buf[2]);
       if (Common::swap16(reply->address) != 0x00fe)
@@ -320,10 +308,10 @@ bool Wiimote::IsBalanceBoard()
       // A Balance Board ext can be identified by checking for 0x0402.
       return reply->data[0] == 0x04 && reply->data[1] == 0x02;
     }
-    case InputReportID::ACK:
+    case InputReportID::Ack:
     {
       const auto* ack = reinterpret_cast<InputReportAck*>(&buf[2]);
-      if (ack->rpt_id == OutputReportID::READ_DATA && ack->error_code != ErrorCode::SUCCESS)
+      if (ack->rpt_id == OutputReportID::ReadData && ack->error_code != ErrorCode::Success)
       {
         WARN_LOG(WIIMOTE, "Failed to read from 0xa400fe, assuming Wiimote is not a Balance Board.");
         return false;
@@ -338,7 +326,7 @@ bool Wiimote::IsBalanceBoard()
 
 static bool IsDataReport(const Report& rpt)
 {
-  return rpt.size() >= 2 && rpt[1] >= u8(InputReportID::REPORT_CORE);
+  return rpt.size() >= 2 && rpt[1] >= u8(InputReportID::ReportCore);
 }
 
 // Returns the next report that should be sent
@@ -387,30 +375,17 @@ void Wiimote::Update()
 
 bool Wiimote::CheckForButtonPress()
 {
-  const Report& rpt = ProcessReadQueue();
+  Report& rpt = ProcessReadQueue();
   if (rpt.size() >= 4)
   {
-    switch (InputReportID(rpt[1]))
+    const auto mode = InputReportID(rpt[1]);
+    if (DataReportBuilder::IsValidMode(mode))
     {
-    case InputReportID::REPORT_CORE:
-    case InputReportID::REPORT_CORE_ACCEL:
-    case InputReportID::REPORT_CORE_EXT8:
-    case InputReportID::REPORT_CORE_ACCEL_IR12:
-    case InputReportID::REPORT_CORE_EXT19:
-    case InputReportID::REPORT_CORE_ACCEL_EXT16:
-    case InputReportID::REPORT_CORE_IR10_EXT9:
-    case InputReportID::REPORT_CORE_ACCEL_IR10_EXT6:
-    case InputReportID::REPORT_INTERLEAVE1:
-    case InputReportID::REPORT_INTERLEAVE2:
-      // check any button without checking accelerometer data
-      // TODO: use the structs!
-      if ((rpt[2] & 0x1F) != 0 || (rpt[3] & 0x9F) != 0)
-      {
-        return true;
-      }
-      break;
-    default:
-      break;
+      auto builder = MakeDataReportManipulator(mode, rpt.data() + 2);
+      ButtonData buttons = {};
+      builder->GetCoreData(&buttons);
+
+      return buttons.hex != 0;
     }
   }
   return false;
@@ -426,19 +401,19 @@ bool Wiimote::PrepareOnThread()
 {
   // core buttons, no continuous reporting
   // TODO: use the structs..
-  u8 static const mode_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::REPORT_MODE), 0,
-                                   u8(InputReportID::REPORT_CORE)};
+  u8 static const mode_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::ReportMode), 0,
+                                   u8(InputReportID::ReportCore)};
 
   // Set the active LEDs and turn on rumble.
-  u8 static led_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::LEDS), 0};
+  u8 static led_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::LED), 0};
   led_report[2] = u8(u8(LED::LED_1) << (m_index % WIIMOTE_BALANCE_BOARD) | 0x1);
 
   // Turn off rumble
-  u8 static const rumble_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::RUMBLE), 0};
+  u8 static const rumble_report[] = {WR_SET_REPORT | BT_OUTPUT, u8(OutputReportID::Rumble), 0};
 
   // Request status report
   u8 static const req_status_report[] = {WR_SET_REPORT | BT_OUTPUT,
-                                         u8(OutputReportID::REQUEST_STATUS), 0};
+                                         u8(OutputReportID::RequestStatus), 0};
   // TODO: check for sane response?
 
   return (IOWrite(mode_report, sizeof(mode_report)) && IOWrite(led_report, sizeof(led_report)) &&
@@ -473,7 +448,7 @@ void Wiimote::EmuResume()
   OutputReportMode rpt = {};
   rpt.mode = wm->m_reporting_mode;
   rpt.continuous = 1;
-  QueueReport(u8(OutputReportID::REPORT_MODE), &rpt, sizeof(rpt));
+  QueueReport(u8(OutputReportID::ReportMode), &rpt, sizeof(rpt));
 
   NOTICE_LOG(WIIMOTE, "Resuming Wiimote data reporting.");
 
@@ -485,9 +460,9 @@ void Wiimote::EmuPause()
   m_last_input_report.clear();
 
   OutputReportMode rpt = {};
-  rpt.mode = InputReportID::REPORT_CORE;
+  rpt.mode = InputReportID::ReportCore;
   rpt.continuous = 0;
-  QueueReport(u8(OutputReportID::REPORT_MODE), &rpt, sizeof(rpt));
+  QueueReport(u8(OutputReportID::ReportMode), &rpt, sizeof(rpt));
 
   NOTICE_LOG(WIIMOTE, "Pausing Wiimote data reporting.");
 
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
index 15c955986f..01e1001f57 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
@@ -25,7 +25,7 @@ namespace WiimoteReal
 {
 using WiimoteCommon::MAX_PAYLOAD;
 
-typedef std::vector<u8> Report;
+using Report = std::vector<u8>;
 
 constexpr u32 WIIMOTE_DEFAULT_TIMEOUT = 1000;
 
diff --git a/Source/Core/Core/Movie.cpp b/Source/Core/Core/Movie.cpp
index ae12975895..93cc595eb6 100644
--- a/Source/Core/Core/Movie.cpp
+++ b/Source/Core/Core/Movie.cpp
@@ -51,6 +51,7 @@
 #include "Core/HW/WiimoteEmu/Encryption.h"
 #include "Core/HW/WiimoteEmu/Extension/Classic.h"
 #include "Core/HW/WiimoteEmu/Extension/Nunchuk.h"
+#include "Core/HW/WiimoteEmu/ExtensionPort.h"
 
 #include "Core/IOS/USB/Bluetooth/BTEmu.h"
 #include "Core/IOS/USB/Bluetooth/WiimoteDevice.h"
@@ -706,7 +707,7 @@ static void SetWiiInputDisplayString(int remoteID, const DataReportBuilder& rpt,
   }
 
   // Nunchuk
-  if (rpt.HasExt() && ext == 1)
+  if (rpt.HasExt() && ext == ExtensionNumber::NUNCHUK)
   {
     const u8* const extData = rpt.GetExtDataPtr();
 
@@ -728,7 +729,7 @@ static void SetWiiInputDisplayString(int remoteID, const DataReportBuilder& rpt,
   }
 
   // Classic controller
-  if (rpt.HasExt() && ext == 2)
+  if (rpt.HasExt() && ext == ExtensionNumber::CLASSIC)
   {
     const u8* const extData = rpt.GetExtDataPtr();
 
diff --git a/Source/Core/Core/Movie.h b/Source/Core/Core/Movie.h
index aac76fdd84..02acfa6661 100644
--- a/Source/Core/Core/Movie.h
+++ b/Source/Core/Core/Movie.h
@@ -10,14 +10,22 @@
 #include <string>
 
 #include "Common/CommonTypes.h"
-#include "Core/HW/WiimoteCommon/DataReport.h"
-#include "Core/HW/WiimoteEmu/Encryption.h"
 
 struct BootParameters;
 
 struct GCPadStatus;
 class PointerWrap;
 
+namespace WiimoteCommon
+{
+class DataReportBuilder;
+}
+
+namespace WiimoteEmu
+{
+class EncryptionKey;
+}
+
 // Per-(video )Movie actions
 
 namespace Movie
diff --git a/Source/Core/Core/NetPlayClient.cpp b/Source/Core/Core/NetPlayClient.cpp
index 0acee31f3a..9daa698166 100644
--- a/Source/Core/Core/NetPlayClient.cpp
+++ b/Source/Core/Core/NetPlayClient.cpp
@@ -53,7 +53,7 @@
 #include "Core/Movie.h"
 #include "Core/PowerPC/PowerPC.h"
 #include "Core/WiiRoot.h"
-#include "InputCommon/ControllerEmu/ControlGroup/Extension.h"
+#include "InputCommon/ControllerEmu/ControlGroup/Attachments.h"
 #include "InputCommon/GCAdapter.h"
 #include "InputCommon/InputConfig.h"
 #include "UICommon/GameFile.h"
@@ -2191,11 +2191,10 @@ void SetupWiimotes()
   {
     if (wiimote_map[i] > 0)
     {
-      static_cast<ControllerEmu::Extension*>(
-          static_cast<WiimoteEmu::Wiimote*>(
-              Wiimote::GetConfig()->GetController(static_cast<int>(i)))
-              ->GetWiimoteGroup(WiimoteEmu::WiimoteGroup::Extension))
-          ->switch_extension = netplay_settings.m_WiimoteExtension[i];
+      static_cast<ControllerEmu::Attachments*>(
+          static_cast<WiimoteEmu::Wiimote*>(Wiimote::GetConfig()->GetController(int(i)))
+              ->GetWiimoteGroup(WiimoteEmu::WiimoteGroup::Attachments))
+          ->SetSelectedAttachment(netplay_settings.m_WiimoteExtension[i]);
     }
   }
 }
diff --git a/Source/Core/Core/NetPlayServer.cpp b/Source/Core/Core/NetPlayServer.cpp
index 9a96346f0f..c12bafb5b2 100644
--- a/Source/Core/Core/NetPlayServer.cpp
+++ b/Source/Core/Core/NetPlayServer.cpp
@@ -49,7 +49,7 @@
 #include "Core/IOS/IOS.h"
 #include "Core/NetPlayClient.h"  //for NetPlayUI
 #include "DiscIO/Enums.h"
-#include "InputCommon/ControllerEmu/ControlGroup/Extension.h"
+#include "InputCommon/ControllerEmu/ControlGroup/Attachments.h"
 #include "InputCommon/GCPadStatus.h"
 #include "InputCommon/InputConfig.h"
 #include "UICommon/GameFile.h"
@@ -1217,11 +1217,11 @@ bool NetPlayServer::StartGame()
 
   for (size_t i = 0; i < m_settings.m_WiimoteExtension.size(); i++)
   {
-    const int extension = static_cast<ControllerEmu::Extension*>(
-                              static_cast<WiimoteEmu::Wiimote*>(
-                                  Wiimote::GetConfig()->GetController(static_cast<int>(i)))
-                                  ->GetWiimoteGroup(WiimoteEmu::WiimoteGroup::Extension))
-                              ->switch_extension;
+    const int extension =
+        static_cast<ControllerEmu::Attachments*>(
+            static_cast<WiimoteEmu::Wiimote*>(Wiimote::GetConfig()->GetController(int(i)))
+                ->GetWiimoteGroup(WiimoteEmu::WiimoteGroup::Attachments))
+            ->GetSelectedAttachment();
     spac << extension;
   }
 
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
index 746bc523ab..81e76eccfe 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
@@ -32,6 +32,6 @@ public:
 private:
   std::vector<std::unique_ptr<EmulatedController>> m_attachments;
 
-  std::atomic<u32> m_selected_attachment;
+  std::atomic<u32> m_selected_attachment = {};
 };
 }  // namespace ControllerEmu