diff --git a/dev/tools/gen_keycodes/data/keyboard_key.tmpl b/dev/tools/gen_keycodes/data/keyboard_key.tmpl
index 80cf3b4d00..37da2944bf 100644
--- a/dev/tools/gen_keycodes/data/keyboard_key.tmpl
+++ b/dev/tools/gen_keycodes/data/keyboard_key.tmpl
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
+import 'package:flutter/foundation.dart';
 
 // DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
 // This file is generated by dev/tools/gen_keycodes/bin/gen_keycodes.dart and
@@ -11,8 +11,6 @@
 // Edit the template dev/tools/gen_keycodes/data/keyboard_key.tmpl instead.
 // See dev/tools/gen_keycodes/README.md for more information.
 
-import 'package:flutter/foundation.dart';
-
 /// A base class for all keyboard key types.
 ///
 /// See also:
@@ -138,7 +136,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   /// const LogicalKeyboardKey(0x0010000000a, debugName: kReleaseMode ? null : 'Special Key')
   /// ```
   /// {@end-tool}
-  const LogicalKeyboardKey(this.keyId, {this.debugName, this.keyLabel})
+  const LogicalKeyboardKey(this.keyId, {this.debugName, this.keyLabel = ''})
       : assert(keyId != null);
 
   /// A unique code representing this key.
@@ -156,7 +154,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   /// This value is useful for describing or matching mnemonic keyboard
   /// shortcuts.
   ///
-  /// This value can be null if there's no key label data for a key.
+  /// This value is an empty string if there's no key label data for a key.
   ///
   /// On most platforms this is a single code point, but it could contain any
   /// Unicode string. The `keyLabel` differs from [RawKeyEvent.character]
@@ -166,7 +164,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   /// “o” for [keyLabel], but would return “ö” for [RawKeyEvent.character].
   ///
   /// {@macro flutter.services.RawKeyEventData.keyLabel}
-  final String? keyLabel;
+  final String keyLabel;
 
   @override
   int get hashCode => keyId.hashCode;
@@ -194,7 +192,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   ///
   /// Used by [RawKeyEvent] subclasses to help construct IDs.
   static bool isControlCharacter(String label) {
-    if (label.length > 1) {
+    if (label.length != 1) {
       return false;
     }
     final int codeUnit = label.codeUnitAt(0);
diff --git a/packages/flutter/lib/src/services/keyboard_key.dart b/packages/flutter/lib/src/services/keyboard_key.dart
index 63e560f8d6..e80f5e674b 100644
--- a/packages/flutter/lib/src/services/keyboard_key.dart
+++ b/packages/flutter/lib/src/services/keyboard_key.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter/foundation.dart';
 
 // DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
 // This file is generated by dev/tools/gen_keycodes/bin/gen_keycodes.dart and
@@ -10,8 +11,6 @@
 // Edit the template dev/tools/gen_keycodes/data/keyboard_key.tmpl instead.
 // See dev/tools/gen_keycodes/README.md for more information.
 
-import 'package:flutter/foundation.dart';
-
 /// A base class for all keyboard key types.
 ///
 /// See also:
@@ -137,7 +136,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   /// const LogicalKeyboardKey(0x0010000000a, debugName: kReleaseMode ? null : 'Special Key')
   /// ```
   /// {@end-tool}
-  const LogicalKeyboardKey(this.keyId, {this.debugName, this.keyLabel})
+  const LogicalKeyboardKey(this.keyId, {this.debugName, this.keyLabel = ''})
       : assert(keyId != null);
 
   /// A unique code representing this key.
@@ -155,7 +154,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   /// This value is useful for describing or matching mnemonic keyboard
   /// shortcuts.
   ///
-  /// This value can be null if there's no key label data for a key.
+  /// This value is an empty string if there's no key label data for a key.
   ///
   /// On most platforms this is a single code point, but it could contain any
   /// Unicode string. The `keyLabel` differs from [RawKeyEvent.character]
@@ -165,7 +164,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   /// “o” for [keyLabel], but would return “ö” for [RawKeyEvent.character].
   ///
   /// {@macro flutter.services.RawKeyEventData.keyLabel}
-  final String? keyLabel;
+  final String keyLabel;
 
   @override
   int get hashCode => keyId.hashCode;
@@ -193,7 +192,7 @@ class LogicalKeyboardKey extends KeyboardKey {
   ///
   /// Used by [RawKeyEvent] subclasses to help construct IDs.
   static bool isControlCharacter(String label) {
-    if (label.length > 1) {
+    if (label.length != 1) {
       return false;
     }
     final int codeUnit = label.codeUnitAt(0);
diff --git a/packages/flutter/lib/src/services/raw_keyboard.dart b/packages/flutter/lib/src/services/raw_keyboard.dart
index 7a12ea58e7..46e49dd405 100644
--- a/packages/flutter/lib/src/services/raw_keyboard.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard.dart
@@ -213,6 +213,8 @@ abstract class RawKeyEventData {
 
   /// Returns the Unicode string representing the label on this key.
   ///
+  /// This value is an empty string if there's no key label data for a key.
+  ///
   /// {@template flutter.services.RawKeyEventData.keyLabel}
   /// Do not use the [keyLabel] to compose a text string: it will be missing
   /// special processing for Unicode strings for combining characters and other
@@ -226,7 +228,7 @@ abstract class RawKeyEventData {
   /// complexities of managing keyboard input, like showing a soft keyboard or
   /// interacting with an input method editor (IME).
   /// {@endtemplate}
-  String? get keyLabel;
+  String get keyLabel;
 }
 
 /// Defines the interface for raw key events.
@@ -308,17 +310,17 @@ abstract class RawKeyEvent with Diagnosticable {
         break;
       case 'web':
         data = RawKeyEventDataWeb(
-          code: message['code'] as String,
-          key: message['key'] as String,
-          metaState: message['metaState'] as int,
+          code: message['code'] as String? ?? '',
+          key: message['key'] as String? ?? '',
+          metaState: message['metaState'] as int? ?? 0,
         );
         break;
       case 'windows':
         data = RawKeyEventDataWindows(
-          keyCode: message['keyCode'] as int,
-          scanCode: message['scanCode'] as int,
-          characterCodePoint: message['characterCodePoint'] as int,
-          modifiers: message['modifiers'] as int,
+          keyCode: message['keyCode'] as int? ?? 0,
+          scanCode: message['scanCode'] as int? ?? 0,
+          characterCodePoint: message['characterCodePoint'] as int? ?? 0,
+          modifiers: message['modifiers'] as int? ?? 0,
         );
         break;
       default:
diff --git a/packages/flutter/lib/src/services/raw_keyboard_android.dart b/packages/flutter/lib/src/services/raw_keyboard_android.dart
index 12a972bf08..4d92b4485a 100644
--- a/packages/flutter/lib/src/services/raw_keyboard_android.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard_android.dart
@@ -147,7 +147,7 @@ class RawKeyEventDataAndroid extends RawKeyEventData {
 
   // Android only reports a single code point for the key label.
   @override
-  String? get keyLabel => plainCodePoint == 0 ? null : String.fromCharCode(plainCodePoint & _kCombiningCharacterMask);
+  String get keyLabel => plainCodePoint == 0 ? '' : String.fromCharCode(plainCodePoint & _kCombiningCharacterMask);
 
   @override
   PhysicalKeyboardKey get physicalKey {
@@ -191,13 +191,13 @@ class RawKeyEventDataAndroid extends RawKeyEventData {
     // constant, or construct a new Unicode-based key from it. Don't mark it as
     // autogenerated, since the label uniquely identifies an ID from the Unicode
     // plane.
-    if (keyLabel != null && keyLabel!.isNotEmpty && !LogicalKeyboardKey.isControlCharacter(keyLabel!)) {
+    if (keyLabel.isNotEmpty && !LogicalKeyboardKey.isControlCharacter(keyLabel)) {
       final int combinedCodePoint = plainCodePoint & _kCombiningCharacterMask;
       final int keyId = LogicalKeyboardKey.unicodePlane | (combinedCodePoint & LogicalKeyboardKey.valueMask);
       return LogicalKeyboardKey.findKeyByKeyId(keyId) ?? LogicalKeyboardKey(
         keyId,
         keyLabel: keyLabel,
-        debugName: kReleaseMode ? null : 'Key ${keyLabel!.toUpperCase()}',
+        debugName: kReleaseMode ? null : 'Key ${keyLabel.toUpperCase()}',
       );
     }
 
diff --git a/packages/flutter/lib/src/services/raw_keyboard_fuchsia.dart b/packages/flutter/lib/src/services/raw_keyboard_fuchsia.dart
index f8b53dcaae..fff0e91451 100644
--- a/packages/flutter/lib/src/services/raw_keyboard_fuchsia.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard_fuchsia.dart
@@ -61,7 +61,7 @@ class RawKeyEventDataFuchsia extends RawKeyEventData {
 
   // Fuchsia only reports a single code point for the key label.
   @override
-  String? get keyLabel => codePoint == 0 ? null : String.fromCharCode(codePoint);
+  String get keyLabel => codePoint == 0 ? '' : String.fromCharCode(codePoint);
 
   @override
   LogicalKeyboardKey get logicalKey {
diff --git a/packages/flutter/lib/src/services/raw_keyboard_linux.dart b/packages/flutter/lib/src/services/raw_keyboard_linux.dart
index 990712cf83..7ea87d88c3 100644
--- a/packages/flutter/lib/src/services/raw_keyboard_linux.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard_linux.dart
@@ -70,7 +70,7 @@ class RawKeyEventDataLinux extends RawKeyEventData {
   final bool isDown;
 
   @override
-  String? get keyLabel => unicodeScalarValues == 0 ? null : String.fromCharCode(unicodeScalarValues);
+  String get keyLabel => unicodeScalarValues == 0 ? '' : String.fromCharCode(unicodeScalarValues);
 
   @override
   PhysicalKeyboardKey get physicalKey => kLinuxToPhysicalKey[scanCode] ?? PhysicalKeyboardKey.none;
@@ -89,13 +89,13 @@ class RawKeyEventDataLinux extends RawKeyEventData {
     // constant, or construct a new Unicode-based key from it. Don't mark it as
     // autogenerated, since the label uniquely identifies an ID from the Unicode
     // plane.
-    if (keyLabel != null &&
-        !LogicalKeyboardKey.isControlCharacter(keyLabel!)) {
+    if (keyLabel.isNotEmpty &&
+        !LogicalKeyboardKey.isControlCharacter(keyLabel)) {
       final int keyId = LogicalKeyboardKey.unicodePlane | (unicodeScalarValues & LogicalKeyboardKey.valueMask);
       return LogicalKeyboardKey.findKeyByKeyId(keyId) ?? LogicalKeyboardKey(
         keyId,
         keyLabel: keyLabel,
-        debugName: kReleaseMode ? null : 'Key ${keyLabel!.toUpperCase()}',
+        debugName: kReleaseMode ? null : 'Key ${keyLabel.toUpperCase()}',
       );
     }
 
diff --git a/packages/flutter/lib/src/services/raw_keyboard_macos.dart b/packages/flutter/lib/src/services/raw_keyboard_macos.dart
index 60797b92a6..45148ed7aa 100644
--- a/packages/flutter/lib/src/services/raw_keyboard_macos.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard_macos.dart
@@ -62,7 +62,7 @@ class RawKeyEventDataMacOs extends RawKeyEventData {
   final int modifiers;
 
   @override
-  String? get keyLabel => charactersIgnoringModifiers.isEmpty ? null : charactersIgnoringModifiers;
+  String get keyLabel => charactersIgnoringModifiers;
 
   @override
   PhysicalKeyboardKey get physicalKey => kMacOsToPhysicalKey[keyCode] ?? PhysicalKeyboardKey.none;
@@ -76,15 +76,17 @@ class RawKeyEventDataMacOs extends RawKeyEventData {
     if (numPadKey != null) {
       return numPadKey;
     }
-    // If this key is printable, generate the LogicalKeyboardKey from its Unicode value.
-    // Control keys such as ESC, CRTL, and SHIFT are not printable. HOME, DEL, arrow keys, and function
-    // keys are considered modifier function keys, which generate invalid Unicode scalar values.
-    if (keyLabel != null &&
-        !LogicalKeyboardKey.isControlCharacter(keyLabel!) &&
-        !_isUnprintableKey(keyLabel!)) {
-      // Given that charactersIgnoringModifiers can contain a String of arbitrary length,
-      // limit to a maximum of two Unicode scalar values. It is unlikely that a keyboard would produce a code point
-      // bigger than 32 bits, but it is still worth defending against this case.
+    // If this key is printable, generate the LogicalKeyboardKey from its
+    // Unicode value. Control keys such as ESC, CRTL, and SHIFT are not
+    // printable. HOME, DEL, arrow keys, and function keys are considered
+    // modifier function keys, which generate invalid Unicode scalar values.
+    if (keyLabel.isNotEmpty &&
+        !LogicalKeyboardKey.isControlCharacter(keyLabel) &&
+        !_isUnprintableKey(keyLabel)) {
+      // Given that charactersIgnoringModifiers can contain a String of
+      // arbitrary length, limit to a maximum of two Unicode scalar values. It
+      // is unlikely that a keyboard would produce a code point bigger than 32
+      // bits, but it is still worth defending against this case.
       assert(charactersIgnoringModifiers.length <= 2);
       int codeUnit = charactersIgnoringModifiers.codeUnitAt(0);
       if (charactersIgnoringModifiers.length == 2) {
@@ -96,20 +98,21 @@ class RawKeyEventDataMacOs extends RawKeyEventData {
       return LogicalKeyboardKey.findKeyByKeyId(keyId) ?? LogicalKeyboardKey(
         keyId,
         keyLabel: keyLabel,
-        debugName: kReleaseMode ? null : 'Key ${keyLabel!.toUpperCase()}',
+        debugName: kReleaseMode ? null : 'Key ${keyLabel.toUpperCase()}',
       );
     }
 
-    // Control keys like "backspace" and movement keys like arrow keys don't have a printable representation,
-    // but are present on the physical keyboard. Since there is no logical keycode map for macOS
-    // (macOS uses the keycode to reference physical keys), a LogicalKeyboardKey is created with
-    // the physical key's HID usage and debugName. This avoids duplicating the physical
-    // key map.
+    // Control keys like "backspace" and movement keys like arrow keys don't
+    // have a printable representation, but are present on the physical
+    // keyboard. Since there is no logical keycode map for macOS (macOS uses the
+    // keycode to reference physical keys), a LogicalKeyboardKey is created with
+    // the physical key's HID usage and debugName. This avoids duplicating the
+    // physical key map.
     if (physicalKey != PhysicalKeyboardKey.none) {
       final int keyId = physicalKey.usbHidUsage | LogicalKeyboardKey.hidPlane;
       return LogicalKeyboardKey.findKeyByKeyId(keyId) ?? LogicalKeyboardKey(
         keyId,
-        keyLabel: physicalKey.debugName,
+        keyLabel: physicalKey.debugName ?? '',
         debugName: physicalKey.debugName,
       );
     }
@@ -129,10 +132,9 @@ class RawKeyEventDataMacOs extends RawKeyEventData {
       return false;
     }
     // If only the "anyMask" bit is set, then we respond true for requests of
-    // whether either left or right is pressed.
-    // Handles the case where macOS supplies just the "either" modifier flag,
-    // but not the left/right flag. (e.g. modifierShift but not
-    // modifierLeftShift).
+    // whether either left or right is pressed. Handles the case where macOS
+    // supplies just the "either" modifier flag, but not the left/right flag.
+    // (e.g. modifierShift but not modifierLeftShift).
     final bool anyOnly = modifiers & (leftMask | rightMask | anyMask) == anyMask;
     switch (side) {
       case KeyboardSide.any:
@@ -229,7 +231,7 @@ class RawKeyEventDataMacOs extends RawKeyEventData {
   ///
   /// Used by [RawKeyEvent] subclasses to help construct IDs.
   static bool _isUnprintableKey(String label) {
-    if (label.length > 1) {
+    if (label.length != 1) {
       return false;
     }
     final int codeUnit = label.codeUnitAt(0);
diff --git a/packages/flutter/lib/src/services/raw_keyboard_web.dart b/packages/flutter/lib/src/services/raw_keyboard_web.dart
index 77b399efcd..3e0edde068 100644
--- a/packages/flutter/lib/src/services/raw_keyboard_web.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard_web.dart
@@ -36,7 +36,7 @@ class RawKeyEventDataWeb extends RawKeyEventData {
   ///
   /// See <https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key>
   /// for more information.
-  final String? key;
+  final String key;
 
   /// The modifiers that were present when the key event occurred.
   ///
@@ -56,7 +56,7 @@ class RawKeyEventDataWeb extends RawKeyEventData {
   final int metaState;
 
   @override
-  String? get keyLabel => key;
+  String get keyLabel => key == 'Unidentified' ? '' : key;
 
   @override
   PhysicalKeyboardKey get physicalKey {
diff --git a/packages/flutter/lib/src/services/raw_keyboard_windows.dart b/packages/flutter/lib/src/services/raw_keyboard_windows.dart
index 1d81eddbea..a88ee17081 100644
--- a/packages/flutter/lib/src/services/raw_keyboard_windows.dart
+++ b/packages/flutter/lib/src/services/raw_keyboard_windows.dart
@@ -54,7 +54,7 @@ class RawKeyEventDataWindows extends RawKeyEventData {
   final int modifiers;
 
   @override
-  String? get keyLabel => characterCodePoint == 0 ? null : String.fromCharCode(characterCodePoint);
+  String get keyLabel => characterCodePoint == 0 ? '' : String.fromCharCode(characterCodePoint);
 
   @override
   PhysicalKeyboardKey get physicalKey => kWindowsToPhysicalKey[scanCode] ?? PhysicalKeyboardKey.none;
@@ -73,12 +73,12 @@ class RawKeyEventDataWindows extends RawKeyEventData {
     // constant, or construct a new Unicode-based key from it. Don't mark it as
     // autogenerated, since the label uniquely identifies an ID from the Unicode
     // plane.
-    if (keyLabel != null && keyLabel!.isNotEmpty && !LogicalKeyboardKey.isControlCharacter(keyLabel!)) {
+    if (keyLabel.isNotEmpty && !LogicalKeyboardKey.isControlCharacter(keyLabel)) {
       final int keyId = LogicalKeyboardKey.unicodePlane | (characterCodePoint & LogicalKeyboardKey.valueMask);
       return LogicalKeyboardKey.findKeyByKeyId(keyId) ?? LogicalKeyboardKey(
         keyId,
         keyLabel: keyLabel,
-        debugName: kReleaseMode ? null : 'Key ${keyLabel!.toUpperCase()}',
+        debugName: kReleaseMode ? null : 'Key ${keyLabel.toUpperCase()}',
       );
     }
     // Look to see if the keyCode is one we know about and have a mapping for.
@@ -104,10 +104,9 @@ class RawKeyEventDataWindows extends RawKeyEventData {
       return false;
     }
     // If only the "anyMask" bit is set, then we respond true for requests of
-    // whether either left or right is pressed.
-    // Handles the case where Windows supplies just the "either" modifier flag,
-    // but not the left/right flag. (e.g. modifierShift but not
-    // modifierLeftShift).
+    // whether either left or right is pressed. Handles the case where Windows
+    // supplies just the "either" modifier flag, but not the left/right flag.
+    // (e.g. modifierShift but not modifierLeftShift).
     final bool anyOnly = modifiers & (leftMask | rightMask | anyMask) == anyMask;
     switch (side) {
       case KeyboardSide.any:
diff --git a/packages/flutter/test/services/raw_keyboard_test.dart b/packages/flutter/test/services/raw_keyboard_test.dart
index 5b28d13ab3..a19c5bb2c6 100644
--- a/packages/flutter/test/services/raw_keyboard_test.dart
+++ b/packages/flutter/test/services/raw_keyboard_test.dart
@@ -601,7 +601,6 @@ void main() {
         'keymap': 'android',
         'keyCode': 111,
         'codePoint': 0,
-        'character': null,
         'scanCode': 1,
         'metaState': 0x0,
         'source': 0x101, // Keyboard source.
@@ -610,7 +609,7 @@ void main() {
       final RawKeyEventDataAndroid data = escapeKeyEvent.data as RawKeyEventDataAndroid;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Modifier keyboard keys are correctly translated', () {
       final RawKeyEvent shiftLeftKeyEvent = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -619,7 +618,6 @@ void main() {
         'keyCode': 59,
         'plainCodePoint': 0,
         'codePoint': 0,
-        'character': null,
         'scanCode': 42,
         'metaState': RawKeyEventDataAndroid.modifierLeftShift,
         'source': 0x101, // Keyboard source.
@@ -628,7 +626,7 @@ void main() {
       final RawKeyEventDataAndroid data = shiftLeftKeyEvent.data as RawKeyEventDataAndroid;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('DPAD keys from a joystick give physical key mappings', () {
       final RawKeyEvent joystickDpadDown = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -637,7 +635,6 @@ void main() {
         'keyCode': 20,
         'plainCodePoint': 0,
         'codePoint': 0,
-        'character': null,
         'scanCode': 0,
         'metaState': 0,
         'source': 0x1000010, // Joystick source.
@@ -646,7 +643,7 @@ void main() {
       final RawKeyEventDataAndroid data = joystickDpadDown.data as RawKeyEventDataAndroid;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.arrowDown));
       expect(data.logicalKey, equals(LogicalKeyboardKey.arrowDown));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Arrow keys from a keyboard give correct physical key mappings', () {
       final RawKeyEvent joystickDpadDown = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -655,7 +652,6 @@ void main() {
         'keyCode': 20,
         'plainCodePoint': 0,
         'codePoint': 0,
-        'character': null,
         'scanCode': 108,
         'metaState': 0,
         'source': 0x101, // Keyboard source.
@@ -663,7 +659,7 @@ void main() {
       final RawKeyEventDataAndroid data = joystickDpadDown.data as RawKeyEventDataAndroid;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.arrowDown));
       expect(data.logicalKey, equals(LogicalKeyboardKey.arrowDown));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('DPAD center from a game pad gives physical key mappings', () {
       final RawKeyEvent joystickDpadCenter = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -672,7 +668,6 @@ void main() {
         'keyCode': 23, // DPAD_CENTER code.
         'plainCodePoint': 0,
         'codePoint': 0,
-        'character': null,
         'scanCode': 317, // Left side thumb joystick center click button.
         'metaState': 0,
         'source': 0x501, // Gamepad and keyboard source.
@@ -681,7 +676,7 @@ void main() {
       final RawKeyEventDataAndroid data = joystickDpadCenter.data as RawKeyEventDataAndroid;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.gameButtonThumbLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.select));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Device id is read from message', () {
       final RawKeyEvent joystickDpadCenter = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -690,7 +685,6 @@ void main() {
         'keyCode': 23, // DPAD_CENTER code.
         'plainCodePoint': 0,
         'codePoint': 0,
-        'character': null,
         'scanCode': 317, // Left side thumb joystick center click button.
         'metaState': 0,
         'source': 0x501, // Gamepad and keyboard source.
@@ -853,13 +847,11 @@ void main() {
         'type': 'keydown',
         'keymap': 'fuchsia',
         'hidUsage': 0x00070029,
-        'codePoint': null,
-        'character': null,
       });
       final RawKeyEventDataFuchsia data = escapeKeyEvent.data as RawKeyEventDataFuchsia;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/35347
 
     test('Modifier keyboard keys are correctly translated', () {
@@ -867,13 +859,11 @@ void main() {
         'type': 'keydown',
         'keymap': 'fuchsia',
         'hidUsage': 0x000700e1,
-        'codePoint': null,
-        'character': null,
       });
       final RawKeyEventDataFuchsia data = shiftLeftKeyEvent.data as RawKeyEventDataFuchsia;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/35347
   });
 
@@ -985,13 +975,12 @@ void main() {
         'keyCode': 0x00000035,
         'characters': '',
         'charactersIgnoringModifiers': '',
-        'character': null,
         'modifiers': 0x0,
       });
       final RawKeyEventDataMacOs data = escapeKeyEvent.data as RawKeyEventDataMacOs;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/35347
 
     test('Modifier keyboard keys are correctly translated', () {
@@ -1001,13 +990,12 @@ void main() {
         'keyCode': 0x00000038,
         'characters': '',
         'charactersIgnoringModifiers': '',
-        'character': null,
         'modifiers': RawKeyEventDataMacOs.modifierLeftShift,
       });
       final RawKeyEventDataMacOs data = shiftLeftKeyEvent.data as RawKeyEventDataMacOs;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/35347
 
     test('Unprintable keyboard keys are correctly translated', () {
@@ -1017,13 +1005,12 @@ void main() {
         'keyCode': 0x0000007B,
         'characters': '',
         'charactersIgnoringModifiers': '', // NSLeftArrowFunctionKey = 0xF702
-        'character': null,
         'modifiers': RawKeyEventDataMacOs.modifierFunction,
       });
       final RawKeyEventDataMacOs data = leftArrowKey.data as RawKeyEventDataMacOs;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.arrowLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.arrowLeft));
-      expect(data.logicalKey.keyLabel, isNull);
+      expect(data.logicalKey.keyLabel, isEmpty);
     }, skip: isBrowser); // https://github.com/flutter/flutter/issues/35347
   });
 
@@ -1140,7 +1127,7 @@ void main() {
       final RawKeyEventDataWindows data = escapeKeyEvent.data as RawKeyEventDataWindows;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Modifier keyboard keys are correctly translated', () {
       final RawKeyEvent shiftLeftKeyEvent = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -1154,7 +1141,7 @@ void main() {
       final RawKeyEventDataWindows data = shiftLeftKeyEvent.data as RawKeyEventDataWindows;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Unprintable keyboard keys are correctly translated', () {
       final RawKeyEvent leftArrowKey = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -1168,7 +1155,7 @@ void main() {
       final RawKeyEventDataWindows data = leftArrowKey.data as RawKeyEventDataWindows;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.arrowLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.arrowLeft));
-      expect(data.logicalKey.keyLabel, isNull);
+      expect(data.logicalKey.keyLabel, isEmpty);
     });
   });
 
@@ -1338,7 +1325,7 @@ void main() {
       final RawKeyEventDataLinux data = escapeKeyEvent.data as RawKeyEventDataLinux;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Modifier keyboard keys are correctly translated', () {
       final RawKeyEvent shiftLeftKeyEvent = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -1352,7 +1339,7 @@ void main() {
       final RawKeyEventDataLinux data = shiftLeftKeyEvent.data as RawKeyEventDataLinux;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
   });
 
@@ -1522,7 +1509,7 @@ void main() {
       final RawKeyEventDataLinux data = escapeKeyEvent.data as RawKeyEventDataLinux;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Modifier keyboard keys are correctly translated', () {
       final RawKeyEvent shiftLeftKeyEvent = RawKeyEvent.fromMessage(const <String, dynamic>{
@@ -1536,7 +1523,7 @@ void main() {
       final RawKeyEventDataLinux data = shiftLeftKeyEvent.data as RawKeyEventDataLinux;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
   });
 
@@ -1557,7 +1544,6 @@ void main() {
           'type': 'keydown',
           'keymap': 'web',
           'code': 'RandomCode',
-          'key': null,
           'metaState': modifier,
         });
         final RawKeyEventDataWeb data = event.data as RawKeyEventDataWeb;
@@ -1588,7 +1574,6 @@ void main() {
           'type': 'keydown',
           'keymap': 'web',
           'code': 'RandomCode',
-          'key': null,
           'metaState': modifier | RawKeyEventDataWeb.modifierMeta,
         });
         final RawKeyEventDataWeb data = event.data as RawKeyEventDataWeb;
@@ -1629,39 +1614,36 @@ void main() {
         'type': 'keydown',
         'keymap': 'web',
         'code': 'Escape',
-        'key': null,
         'metaState': 0x0,
       });
       final RawKeyEventDataWeb data = escapeKeyEvent.data as RawKeyEventDataWeb;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.escape));
       expect(data.logicalKey, equals(LogicalKeyboardKey.escape));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Modifier keyboard keys are correctly translated', () {
       final RawKeyEvent shiftKeyEvent = RawKeyEvent.fromMessage(const <String, dynamic>{
         'type': 'keydown',
         'keymap': 'web',
         'code': 'ShiftLeft',
-        'keyLabel': null,
         'metaState': RawKeyEventDataWeb.modifierShift,
       });
       final RawKeyEventDataWeb data = shiftKeyEvent.data as RawKeyEventDataWeb;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.shiftLeft));
       expect(data.logicalKey, equals(LogicalKeyboardKey.shiftLeft));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
     test('Arrow keys from a keyboard give correct physical key mappings', () {
       final RawKeyEvent arrowKeyDown = RawKeyEvent.fromMessage(const <String, dynamic>{
         'type': 'keydown',
         'keymap': 'web',
         'code': 'ArrowDown',
-        'key': null,
         'metaState': 0x0,
       });
       final RawKeyEventDataWeb data = arrowKeyDown.data as RawKeyEventDataWeb;
       expect(data.physicalKey, equals(PhysicalKeyboardKey.arrowDown));
       expect(data.logicalKey, equals(LogicalKeyboardKey.arrowDown));
-      expect(data.keyLabel, isNull);
+      expect(data.keyLabel, isEmpty);
     });
   });
 }
diff --git a/packages/flutter_test/lib/src/event_simulation.dart b/packages/flutter_test/lib/src/event_simulation.dart
index a38c87f048..f7a65f22a0 100644
--- a/packages/flutter_test/lib/src/event_simulation.dart
+++ b/packages/flutter_test/lib/src/event_simulation.dart
@@ -180,13 +180,17 @@ class KeyEventSimulator {
     switch (platform) {
       case 'android':
         result['keyCode'] = keyCode;
-        result['codePoint'] = key.keyLabel?.codeUnitAt(0);
+        if (key.keyLabel.isNotEmpty) {
+          result['codePoint'] = key.keyLabel.codeUnitAt(0);
+        }
         result['scanCode'] = scanCode;
         result['metaState'] = _getAndroidModifierFlags(key, isDown);
         break;
       case 'fuchsia':
         result['hidUsage'] = physicalKey?.usbHidUsage ?? (key.keyId & LogicalKeyboardKey.hidPlane != 0 ? key.keyId & LogicalKeyboardKey.valueMask : null);
-        result['codePoint'] = key.keyLabel?.codeUnitAt(0);
+        if (key.keyLabel.isNotEmpty) {
+          result['codePoint'] = key.keyLabel.codeUnitAt(0);
+        }
         result['modifiers'] = _getFuchsiaModifierFlags(key, isDown);
         break;
       case 'linux':
@@ -209,7 +213,9 @@ class KeyEventSimulator {
       case 'windows':
         result['keyCode'] = keyCode;
         result['scanCode'] = scanCode;
-        result['characterCodePoint'] = key.keyLabel?.codeUnitAt(0) ?? 0;
+        if (key.keyLabel.isNotEmpty) {
+          result['characterCodePoint'] = key.keyLabel.codeUnitAt(0);
+        }
         result['modifiers'] = _getWindowsModifierFlags(key, isDown);
     }
     return result;