diff --git a/packages/frontend/src/components/MkEmojiPicker.vue b/packages/frontend/src/components/MkEmojiPicker.vue
index 0d3d222f0c..7eeff8d2a4 100644
--- a/packages/frontend/src/components/MkEmojiPicker.vue
+++ b/packages/frontend/src/components/MkEmojiPicker.vue
@@ -49,7 +49,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						@pointerenter="computeButtonTitle"
 						@click="chosen(emoji, $event)"
 					>
-						<MkCustomEmoji v-if="!emoji?.hasOwnProperty('char')" class="emoji" :name="getKey(emoji)" :normal="true"/>
+						<MkCustomEmoji v-if="emoji[0] === ':'" class="emoji" :name="getKey(emoji)" :normal="true"/>
 						<MkEmoji v-else class="emoji" :emoji="getKey(emoji)" :normal="true"/>
 					</button>
 				</div>
@@ -67,7 +67,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						@pointerenter="computeButtonTitle"
 						@click="chosen(emoji, $event)"
 					>
-						<MkCustomEmoji v-if="!emoji?.hasOwnProperty('char')" class="emoji" :name="getKey(emoji)" :normal="true"/>
+						<MkCustomEmoji v-if="emoji[0] === ':'" class="emoji" :name="getKey(emoji)" :normal="true"/>
 						<MkEmoji v-else class="emoji" :emoji="getKey(emoji)" :normal="true"/>
 					</button>
 				</div>
@@ -108,7 +108,6 @@ import * as Misskey from 'misskey-js';
 import XSection from '@/components/MkEmojiPicker.section.vue';
 import {
 	emojilist,
-	unicodeEmojisMap,
 	emojiCharByCategory,
 	UnicodeEmojiDef,
 	unicodeEmojiCategories as categories,
@@ -357,8 +356,8 @@ watch(q, () => {
 	searchResultUnicode.value = Array.from(searchUnicode());
 });
 
-function canReact(emoji: Misskey.entities.EmojiSimple | UnicodeEmojiDef): boolean {
-	return !props.targetNote || checkReactionPermissions($i!, props.targetNote, emoji);
+function canReact(emoji: string | UnicodeEmojiDef | Misskey.entities.EmojiSimple): boolean {
+	return !props.targetNote || typeof emoji === 'string' || Object.hasOwn(emoji, 'char') || checkReactionPermissions($i!, props.targetNote, emoji);
 }
 
 function filterCategory(emoji: Misskey.entities.EmojiSimple, category: string): boolean {
@@ -378,15 +377,21 @@ function reset() {
 	q.value = '';
 }
 
-function getKey(emoji: string | Misskey.entities.EmojiSimple | UnicodeEmojiDef): string {
-	return typeof emoji === 'string' ? emoji : 'char' in emoji ? emoji.char : `:${emoji.name}:`;
+function getKey(emoji: string | UnicodeEmojiDef | Misskey.entities.EmojiSimple): string {
+	if (typeof emoji === 'string') {
+		return emoji;
+	} else if (Object.hasOwn(emoji, 'char')) {
+		return (emoji as UnicodeEmojiDef).char;
+	} else {
+		return `:${emoji.name}:`;
+	}
 }
 
 function getDef(emoji: string) {
 	if (emoji.includes(':')) {
 		return customEmojisMap.get(emoji.replace(/:/g, '')) ?? null;
 	} else {
-		return unicodeEmojisMap.get(emoji) ?? null;
+		return emoji;
 	}
 }
 
diff --git a/packages/frontend/src/components/MkReactionsViewer.reaction.vue b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
index bccee5109d..c33e50b2ce 100644
--- a/packages/frontend/src/components/MkReactionsViewer.reaction.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
@@ -34,7 +34,6 @@ import { i18n } from '@/i18n.js';
 import * as sound from '@/scripts/sound.js';
 import { checkReactionPermissions } from '@/scripts/check-reaction-permissions.js';
 import { customEmojisMap } from '@/custom-emojis.js';
-import { unicodeEmojisMap } from '@/scripts/emojilist.js';
 
 const props = defineProps<{
 	reaction: string;
@@ -45,19 +44,24 @@ const props = defineProps<{
 
 const mock = inject<boolean>('mock', false);
 
-const emit = defineEmits<{
-	(ev: 'reactionToggled', emoji: string, newCount: number): void;
-}>();
+const emit = defineEmits<
+	(ev: 'reactionToggled', emoji: string, newCount: number) => void
+>();
 
 const buttonEl = shallowRef<HTMLElement>();
+const remoteReactionRegExp = /@\w/;
 
+const isCustomEmoji = computed(() => props.reaction.includes(':'));
 const emojiName = computed(() => props.reaction.replace(/:/g, '').replace(/@\./, ''));
-const emoji = computed(() => customEmojisMap.get(emojiName.value) ?? unicodeEmojisMap.get(props.reaction));
+const emoji = computed(() => isCustomEmoji.value ? customEmojisMap.get(emojiName.value) : null);
 
 const canToggle = computed(() => {
-	return !props.reaction.match(/@\w/) && $i && emoji.value && checkReactionPermissions($i, props.note, emoji.value);
+	return !RegExp(remoteReactionRegExp).exec(props.reaction) && $i && (
+		!isCustomEmoji.value
+	|| (emoji.value && checkReactionPermissions($i, props.note, emoji.value))
+	);
 });
-const canGetInfo = computed(() => !props.reaction.match(/@\w/) && props.reaction.includes(':'));
+const canGetInfo = computed(() => !RegExp(remoteReactionRegExp).exec(props.reaction) && props.reaction.includes(':'));
 
 async function toggleReaction() {
 	if (!canToggle.value) return;
diff --git a/packages/frontend/src/scripts/check-reaction-permissions.ts b/packages/frontend/src/scripts/check-reaction-permissions.ts
index 293a97dbaa..530d4f8153 100644
--- a/packages/frontend/src/scripts/check-reaction-permissions.ts
+++ b/packages/frontend/src/scripts/check-reaction-permissions.ts
@@ -1,10 +1,6 @@
 import * as Misskey from 'misskey-js';
-import { UnicodeEmojiDef } from './emojilist.js';
 
-export function checkReactionPermissions(me: Misskey.entities.MeDetailed, note: Misskey.entities.Note, emoji: Misskey.entities.EmojiSimple | UnicodeEmojiDef): boolean {
-	if ('char' in emoji) return true; // UnicodeEmojiDefなら常にリアクション可能
-
-	emoji = emoji as Misskey.entities.EmojiSimple;
+export function checkReactionPermissions(me: Misskey.entities.MeDetailed, note: Misskey.entities.Note, emoji: Misskey.entities.EmojiSimple): boolean {
 	const roleIdsThatCanBeUsedThisEmojiAsReaction = emoji.roleIdsThatCanBeUsedThisEmojiAsReaction ?? [];
 	const roleIdsThatCanNotBeUsedThisEmojiAsReaction = emoji.roleIdsThatCanNotBeUsedThisEmojiAsReaction ?? [];
 
diff --git a/packages/frontend/src/scripts/emojilist.ts b/packages/frontend/src/scripts/emojilist.ts
index 4ec3a6455b..8ecdab96ea 100644
--- a/packages/frontend/src/scripts/emojilist.ts
+++ b/packages/frontend/src/scripts/emojilist.ts
@@ -20,10 +20,6 @@ export const emojilist: UnicodeEmojiDef[] = _emojilist.map(x => ({
 	category: unicodeEmojiCategories[x[2]],
 }));
 
-export const unicodeEmojisMap = new Map<string, UnicodeEmojiDef>(
-	emojilist.map(x => [x.char, x])
-);
-
 const _indexByChar = new Map<string, number>();
 const _charGroupByCategory = new Map<string, string[]>();
 for (let i = 0; i < emojilist.length; i++) {