diff --git a/Source/Core/Core/IOS/USB/Bluetooth/BTReal.cpp b/Source/Core/Core/IOS/USB/Bluetooth/BTReal.cpp
index 4bce44b62e..10aa72c3b5 100644
--- a/Source/Core/Core/IOS/USB/Bluetooth/BTReal.cpp
+++ b/Source/Core/Core/IOS/USB/Bluetooth/BTReal.cpp
@@ -546,8 +546,11 @@ void BluetoothRealDevice::SaveLinkKeys()
     oss << Common::MacAddressToString(address);
     oss << '=';
     oss << std::hex;
-    for (const u16& data : entry.second)
-      oss << std::setfill('0') << std::setw(2) << data;
+    for (u8 data : entry.second)
+    {
+      // We cast to u16 here in order to have it displayed as two nibbles.
+      oss << std::setfill('0') << std::setw(2) << static_cast<u16>(data);
+    }
     oss << std::dec << ',';
   }
   std::string config_string = oss.str();
diff --git a/Source/Core/DolphinQt/Resources.cpp b/Source/Core/DolphinQt/Resources.cpp
index e10f8acfd4..2ab51fb536 100644
--- a/Source/Core/DolphinQt/Resources.cpp
+++ b/Source/Core/DolphinQt/Resources.cpp
@@ -21,9 +21,10 @@ QList<QPixmap> Resources::m_platforms;
 QList<QPixmap> Resources::m_countries;
 QList<QPixmap> Resources::m_misc;
 
-QIcon Resources::GetIcon(const QString& name, const QString& dir)
+QIcon Resources::GetIcon(std::string_view name, const QString& dir)
 {
-  QString base_path = dir + QLatin1Char{'/'} + name;
+  QString name_owned = QString::fromLatin1(name.data(), static_cast<int>(name.size()));
+  QString base_path = dir + QLatin1Char{'/'} + name_owned;
 
   const auto dpr = QGuiApplication::primaryScreen()->devicePixelRatio();
 
@@ -42,7 +43,7 @@ QIcon Resources::GetIcon(const QString& name, const QString& dir)
   return icon;
 }
 
-QPixmap Resources::GetPixmap(const QString& name, const QString& dir)
+QPixmap Resources::GetPixmap(std::string_view name, const QString& dir)
 {
   const auto icon = GetIcon(name, dir);
   return icon.pixmap(icon.availableSizes()[0]);
@@ -58,30 +59,30 @@ static QString GetResourcesDir()
   return QString::fromStdString(File::GetSysDirectory() + "Resources");
 }
 
-QIcon Resources::GetScaledIcon(const std::string& name)
+QIcon Resources::GetScaledIcon(std::string_view name)
 {
-  return GetIcon(QString::fromStdString(name), GetResourcesDir());
+  return GetIcon(name, GetResourcesDir());
 }
 
-QIcon Resources::GetScaledThemeIcon(const std::string& name)
+QIcon Resources::GetScaledThemeIcon(std::string_view name)
 {
-  return GetIcon(QString::fromStdString(name), GetCurrentThemeDir());
+  return GetIcon(name, GetCurrentThemeDir());
 }
 
-QPixmap Resources::GetScaledPixmap(const std::string& name)
+QPixmap Resources::GetScaledPixmap(std::string_view name)
 {
-  return GetPixmap(QString::fromStdString(name), GetResourcesDir());
+  return GetPixmap(name, GetResourcesDir());
 }
 
 void Resources::Init()
 {
-  for (const std::string& platform :
+  for (std::string_view platform :
        {"Platform_Gamecube", "Platform_Wii", "Platform_Wad", "Platform_File"})
   {
     m_platforms.append(GetScaledPixmap(platform));
   }
 
-  for (const std::string& country :
+  for (std::string_view country :
        {"Flag_Europe", "Flag_Japan", "Flag_USA", "Flag_Australia", "Flag_France", "Flag_Germany",
         "Flag_Italy", "Flag_Korea", "Flag_Netherlands", "Flag_Russia", "Flag_Spain", "Flag_Taiwan",
         "Flag_International", "Flag_Unknown"})
diff --git a/Source/Core/DolphinQt/Resources.h b/Source/Core/DolphinQt/Resources.h
index 923c1bf1d9..67ffc23d4d 100644
--- a/Source/Core/DolphinQt/Resources.h
+++ b/Source/Core/DolphinQt/Resources.h
@@ -5,6 +5,7 @@
 
 #include <QList>
 #include <QPixmap>
+#include <string_view>
 
 namespace DiscIO
 {
@@ -30,16 +31,16 @@ public:
 
   static QPixmap GetMisc(MiscID id);
 
-  static QIcon GetScaledIcon(const std::string& name);
-  static QIcon GetScaledThemeIcon(const std::string& name);
+  static QIcon GetScaledIcon(std::string_view name);
+  static QIcon GetScaledThemeIcon(std::string_view name);
   static QIcon GetAppIcon();
 
-  static QPixmap GetScaledPixmap(const std::string& name);
+  static QPixmap GetScaledPixmap(std::string_view name);
 
 private:
   Resources() {}
-  static QIcon GetIcon(const QString& name, const QString& dir);
-  static QPixmap GetPixmap(const QString& name, const QString& dir);
+  static QIcon GetIcon(std::string_view name, const QString& dir);
+  static QPixmap GetPixmap(std::string_view name, const QString& dir);
 
   static QList<QPixmap> m_platforms;
   static QList<QPixmap> m_countries;
diff --git a/Source/Core/DolphinQt/Settings/GameCubePane.cpp b/Source/Core/DolphinQt/Settings/GameCubePane.cpp
index ce45eb54a1..8ec5126f2f 100644
--- a/Source/Core/DolphinQt/Settings/GameCubePane.cpp
+++ b/Source/Core/DolphinQt/Settings/GameCubePane.cpp
@@ -440,7 +440,7 @@ void GameCubePane::LoadSettings()
 
   bool have_menu = false;
 
-  for (const std::string& dir : {USA_DIR, JAP_DIR, EUR_DIR})
+  for (const std::string dir : {USA_DIR, JAP_DIR, EUR_DIR})
   {
     const auto path = DIR_SEP + dir + DIR_SEP GC_IPL;
     if (File::Exists(File::GetUserPath(D_GCUSER_IDX) + path) ||
diff --git a/Source/Core/UICommon/GameFileCache.cpp b/Source/Core/UICommon/GameFileCache.cpp
index 30bbca924b..a1b55b3614 100644
--- a/Source/Core/UICommon/GameFileCache.cpp
+++ b/Source/Core/UICommon/GameFileCache.cpp
@@ -45,7 +45,7 @@ GameFileCache::GameFileCache() : m_path(File::GetUserPath(D_CACHE_IDX) + "gameli
 
 void GameFileCache::ForEach(std::function<void(const std::shared_ptr<const GameFile>&)> f) const
 {
-  for (const std::shared_ptr<const GameFile>& item : m_cached_files)
+  for (const std::shared_ptr<GameFile>& item : m_cached_files)
     f(item);
 }