diff --git a/src/plugins/validUser.tsx b/src/plugins/validUser.tsx
new file mode 100644
index 000000000..d92269ce3
--- /dev/null
+++ b/src/plugins/validUser.tsx
@@ -0,0 +1,143 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2023 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import ErrorBoundary from "@components/ErrorBoundary";
+import { Devs } from "@utils/constants";
+import { sleep } from "@utils/misc";
+import { Queue } from "@utils/Queue";
+import definePlugin from "@utils/types";
+import { findByCodeLazy } from "@webpack";
+import { UserStore, useState } from "@webpack/common";
+import type { User } from "discord-types/general";
+import type { ComponentType } from "react";
+
+const fetching = new Set<string>();
+const queue = new Queue(5);
+const fetchUser = findByCodeLazy("USER(") as (id: string) => Promise<User>;
+
+interface MentionProps {
+    data: {
+        userId?: string;
+        channelId?: string;
+        content: any;
+    };
+    parse: (content: any, props: MentionProps["props"]) => string[];
+    props: {
+        key: string;
+        formatInline: boolean;
+        noStyleAndInteraction: boolean;
+    };
+    RoleMention: ComponentType<any>;
+    UserMention: ComponentType<any>;
+}
+
+function MentionWrapper({ data, UserMention, RoleMention, parse, props }: MentionProps) {
+    const [userId, setUserId] = useState(data.userId);
+
+    // if userId is set it means the user is cached. Uncached users have userId set to undefined
+    if (userId)
+        return (
+            <UserMention
+                className="mention"
+                userId={userId}
+                channelId={data.channelId}
+                inlinePreview={props.noStyleAndInteraction}
+                key={props.key}
+            />
+        );
+
+    // Parses the raw text node array data.content into a ReactNode[]: ["<@userid>"]
+    const children = parse(data.content, props);
+
+    return (
+        // Discord is deranged and renders unknown user mentions as role mentions
+        <RoleMention
+            {...data}
+            inlinePreview={props.formatInline}
+        >
+            <span
+                onMouseEnter={() => {
+                    const mention = children?.[0];
+                    if (typeof mention !== "string") return;
+
+                    const id = mention.match(/<@(\d+)>/)?.[1];
+                    if (!id) return;
+
+                    if (fetching.has(id))
+                        return;
+
+                    if (UserStore.getUser(id))
+                        return setUserId(id);
+
+                    const fetch = () => {
+                        fetching.add(id);
+
+                        queue.unshift(() =>
+                            fetchUser(id)
+                                .then(() => {
+                                    setUserId(id);
+                                    fetching.delete(id);
+                                })
+                                .catch(e => {
+                                    if (e?.status === 429) {
+                                        queue.unshift(() => sleep(1000).then(fetch));
+                                        fetching.delete(id);
+                                    }
+                                })
+                                .finally(() => sleep(300))
+                        );
+                    };
+
+                    fetch();
+                }}
+            >
+                {children}
+            </span>
+        </RoleMention>
+    );
+}
+
+export default definePlugin({
+    name: "ValidUser",
+    description: "Fix mentions for unknown users showing up as '<@343383572805058560>' (hover over a mention to fix it)",
+    authors: [Devs.Ven],
+
+    patches: [{
+        find: 'className:"mention"',
+        replacement: {
+            // mention = { react: function (data, parse, props) { if (data.userId == null) return RoleMention() else return UserMention()
+            match: /react:(?=function\(\i,\i,\i\).{0,50}return null==\i\?\(0,\i\.jsx\)\((\i),.+?jsx\)\((\i),\{className:"mention")/,
+            // react: (...args) => OurWrapper(RoleMention, UserMention, ...args), originalReact: theirFunc
+            replace: "react:(...args)=>$self.renderMention($1,$2,...args),originalReact:"
+        }
+    }],
+
+    renderMention(RoleMention, UserMention, data, parse, props) {
+        return (
+            <ErrorBoundary noop>
+                <MentionWrapper
+                    RoleMention={RoleMention}
+                    UserMention={UserMention}
+                    data={data}
+                    parse={parse}
+                    props={props}
+                />
+            </ErrorBoundary>
+        );
+    },
+});