diff --git a/src/structures/GuildMember.js b/src/structures/GuildMember.js
index 2fff24990d37..7cbd748307f4 100644
--- a/src/structures/GuildMember.js
+++ b/src/structures/GuildMember.js
@@ -259,12 +259,12 @@ class GuildMember extends Base {
   }
 
   /**
-   * The nickname of this member, or their username if they don't have one
+   * The nickname of this member, or their user display name if they don't have one
    * @type {?string}
    * @readonly
    */
   get displayName() {
-    return this.nickname ?? this.user.username;
+    return this.nickname ?? this.user.displayName;
   }
 
   /**
diff --git a/src/structures/User.js b/src/structures/User.js
index dd1880edec3d..a991a80c5109 100644
--- a/src/structures/User.js
+++ b/src/structures/User.js
@@ -5,6 +5,7 @@ const TextBasedChannel = require('./interfaces/TextBasedChannel');
 const { Error } = require('../errors');
 const SnowflakeUtil = require('../util/SnowflakeUtil');
 const UserFlags = require('../util/UserFlags');
+const Util = require('../util/Util');
 
 /**
  * Represents a user on Discord.
@@ -41,6 +42,16 @@ class User extends Base {
       this.username ??= null;
     }
 
+    if ('global_name' in data) {
+      /**
+       * The global name of this user
+       * @type {?string}
+       */
+      this.globalName = data.global_name;
+    } else {
+      this.globalName ??= null;
+    }
+
     if ('bot' in data) {
       /**
        * Whether or not the user is a bot
@@ -53,7 +64,8 @@ class User extends Base {
 
     if ('discriminator' in data) {
       /**
-       * A discriminator based on username for the user
+       * The discriminator of this user
+       * <info>`'0'`, or a 4-digit stringified number if they're using the legacy username system</info>
        * @type {?string}
        */
       this.discriminator = data.discriminator;
@@ -155,7 +167,8 @@ class User extends Base {
    * @readonly
    */
   get defaultAvatarURL() {
-    return this.client.rest.cdn.DefaultAvatar(this.discriminator % 5);
+    const index = this.discriminator === '0' ? Util.calculateUserDefaultAvatarIndex(this.id) : this.discriminator % 5;
+    return this.client.rest.cdn.DefaultAvatar(index);
   }
 
   /**
@@ -193,12 +206,27 @@ class User extends Base {
   }
 
   /**
-   * The Discord "tag" (e.g. `hydrabolt#0001`) for this user
+   * The tag of this user
+   * <info>This user's username, or their legacy tag (e.g. `hydrabolt#0001`)
+   * if they're using the legacy username system</info>
    * @type {?string}
    * @readonly
    */
   get tag() {
-    return typeof this.username === 'string' ? `${this.username}#${this.discriminator}` : null;
+    return typeof this.username === 'string'
+      ? this.discriminator === '0'
+        ? this.username
+        : `${this.username}#${this.discriminator}`
+      : null;
+  }
+
+  /**
+   * The global name of this user, or their username if they don't have one
+   * @type {?string}
+   * @readonly
+   */
+  get displayName() {
+    return this.globalName ?? this.username;
   }
 
   /**
@@ -240,6 +268,7 @@ class User extends Base {
       this.id === user.id &&
       this.username === user.username &&
       this.discriminator === user.discriminator &&
+      this.globalName === user.globalName &&
       this.avatar === user.avatar &&
       this.flags?.bitfield === user.flags?.bitfield &&
       this.banner === user.banner &&
@@ -259,6 +288,7 @@ class User extends Base {
       this.id === user.id &&
       this.username === user.username &&
       this.discriminator === user.discriminator &&
+      this.globalName === user.global_name &&
       this.avatar === user.avatar &&
       this.flags?.bitfield === user.public_flags &&
       ('banner' in user ? this.banner === user.banner : true) &&
diff --git a/src/util/Constants.js b/src/util/Constants.js
index 63cd4d3e2011..e3a86cf058b6 100644
--- a/src/util/Constants.js
+++ b/src/util/Constants.js
@@ -68,7 +68,7 @@ exports.Endpoints = {
     return {
       Emoji: (emojiId, format = 'webp') => `${root}/emojis/${emojiId}.${format}`,
       Asset: name => `${root}/assets/${name}`,
-      DefaultAvatar: discriminator => `${root}/embed/avatars/${discriminator}.png`,
+      DefaultAvatar: index => `${root}/embed/avatars/${index}.png`,
       Avatar: (userId, hash, format, size, dynamic = false) => {
         if (dynamic && hash.startsWith('a_')) format = 'gif';
         return makeImageUrl(`${root}/avatars/${userId}/${hash}`, { format, size });
diff --git a/src/util/Util.js b/src/util/Util.js
index 205e9a024bd1..34e3e24fe7ea 100644
--- a/src/util/Util.js
+++ b/src/util/Util.js
@@ -741,6 +741,15 @@ class Util extends null {
       emoji_name: defaultReaction.name,
     };
   }
+
+  /**
+   * Calculates the default avatar index for a given user id.
+   * @param {Snowflake} userId - The user id to calculate the default avatar index for
+   * @returns {number}
+   */
+  static calculateUserDefaultAvatarIndex(userId) {
+    return Number(BigInt(userId) >> 22n) % 6;
+  }
 }
 
 module.exports = Util;
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 116d4fbb7779..b53d3e6676c1 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -2703,9 +2703,11 @@ export class User extends PartialTextBasedChannel(Base) {
   public readonly createdAt: Date;
   public readonly createdTimestamp: number;
   public discriminator: string;
+  public readonly displayName: string;
   public readonly defaultAvatarURL: string;
   public readonly dmChannel: DMChannel | null;
   public flags: Readonly<UserFlags> | null;
+  public globalName: string | null;
   public readonly hexAccentColor: HexColorString | null | undefined;
   public id: Snowflake;
   public readonly partial: false;
@@ -2785,6 +2787,7 @@ export class Util extends null {
   public static splitMessage(text: string, options?: SplitOptions): string[];
   /** @deprecated This will be removed in the next major version. */
   public static resolveAutoArchiveMaxLimit(guild: Guild): Exclude<ThreadAutoArchiveDuration, 60>;
+  public static calculateUserDefaultAvatarIndex(userId: Snowflake): number;
 }
 
 export class Formatters extends null {
@@ -3093,7 +3096,7 @@ export const Constants: {
         dynamic: boolean,
       ): string;
       Banner(id: Snowflake, hash: string, format: DynamicImageFormat, size: AllowedImageSize, dynamic: boolean): string;
-      DefaultAvatar(discriminator: number): string;
+      DefaultAvatar(index: number): string;
       DiscoverySplash(guildId: Snowflake, hash: string, format: AllowedImageFormat, size: AllowedImageSize): string;
       Emoji(emojiId: Snowflake, format: DynamicImageFormat): string;
       GDMIcon(channelId: Snowflake, hash: string, format: AllowedImageFormat, size: AllowedImageSize): string;