diff --git a/.changeset/bright-roblox-profile.md b/.changeset/bright-roblox-profile.md
new file mode 100644
index 0000000000..7e02b0136b
--- /dev/null
+++ b/.changeset/bright-roblox-profile.md
@@ -0,0 +1,5 @@
+---
+"@better-auth/core": minor
+---
+
+Correct Roblox profile types for optional scoped claims and nullable pictures, and normalize missing local images.
diff --git a/packages/core/src/social-providers/roblox.test.ts b/packages/core/src/social-providers/roblox.test.ts
index 5d39902005..98cc635870 100644
--- a/packages/core/src/social-providers/roblox.test.ts
+++ b/packages/core/src/social-providers/roblox.test.ts
@@ -1,11 +1,11 @@
-import { describe, expect, it, vi } from "vitest";
+import { describe, expect, expectTypeOf, it, vi } from "vitest";
 
 vi.mock(import("@better-fetch/fetch"), () => ({
 	betterFetch: vi.fn(),
 }));
 
 import { betterFetch } from "@better-fetch/fetch";
-
+import type { RobloxProfile } from "./roblox";
 import { roblox } from "./roblox";
 
 const mockedBetterFetch = vi.mocked(betterFetch);
@@ -33,3 +33,75 @@ describe("roblox.getUserInfo", () => {
 		expect(result?.user.email).toBe("roblox-user-1@roblox.placeholder.invalid");
 	});
 });
+
+/**
+ * @see https://create.roblox.com/docs/cloud/auth/oauth2-reference
+ */
+describe("Roblox userinfo claims", () => {
+	it("accepts a subject-only response without the profile scope", async () => {
+		const profile = { sub: "roblox-user-1" } satisfies RobloxProfile;
+		mockedBetterFetch.mockResolvedValue({ data: profile, error: null });
+		const provider = roblox({
+			clientId: "roblox-app",
+			clientSecret: "roblox-secret",
+			disableDefaultScope: true,
+			scope: ["openid"],
+			mapProfileToUser(rawProfile) {
+				expectTypeOf(rawProfile.sub).toEqualTypeOf<string>();
+				expectTypeOf(rawProfile.preferred_username).toEqualTypeOf<
+					string | undefined
+				>();
+				expectTypeOf(rawProfile.nickname).toEqualTypeOf<string | undefined>();
+				expectTypeOf(rawProfile.name).toEqualTypeOf<string | undefined>();
+				expectTypeOf(rawProfile.created_at).toEqualTypeOf<number | undefined>();
+				expectTypeOf(rawProfile.profile).toEqualTypeOf<string | undefined>();
+				expectTypeOf(rawProfile.picture).toEqualTypeOf<
+					string | null | undefined
+				>();
+				expectTypeOf(rawProfile.custom_claim).toEqualTypeOf<unknown>();
+				return {};
+			},
+		});
+		const result = await provider.getUserInfo({ accessToken: "access-token" });
+
+		expect(result?.user).toEqual({
+			name: "",
+			image: undefined,
+			email: "roblox-user-1@roblox.placeholder.invalid",
+			emailVerified: false,
+		});
+		expect(result?.data).toEqual(profile);
+		expect(
+			provider.accountSubject({
+				profile,
+				tokens: { accessToken: "access-token" },
+			}),
+		).toBe(profile.sub);
+	});
+
+	it.each([null, "https://example.com/avatar.png"])(
+		"preserves the raw picture %s while normalizing the local image",
+		async (picture) => {
+			const profile = {
+				sub: "roblox-user-1",
+				nickname: "Builderman",
+				picture,
+			} satisfies RobloxProfile;
+			mockedBetterFetch.mockResolvedValue({ data: profile, error: null });
+			const mapProfileToUser = vi.fn((rawProfile: RobloxProfile) => {
+				expect(rawProfile).toEqual(profile);
+				return {};
+			});
+			const result = await roblox({
+				clientId: "roblox-app",
+				clientSecret: "roblox-secret",
+				mapProfileToUser,
+			}).getUserInfo({ accessToken: "access-token" });
+
+			expect(result?.user.image).toBe(picture ?? undefined);
+			expect(result?.user.name).toBe("Builderman");
+			expect(result?.data.picture).toBe(picture);
+			expect(mapProfileToUser).toHaveBeenCalledOnce();
+		},
+	);
+});
diff --git a/packages/core/src/social-providers/roblox.ts b/packages/core/src/social-providers/roblox.ts
index dfded6a68c..6bf77f38ef 100644
--- a/packages/core/src/social-providers/roblox.ts
+++ b/packages/core/src/social-providers/roblox.ts
@@ -7,21 +7,21 @@ import {
 } from "../oauth2";
 import { createPlaceholderEmail } from "../utils/email";
 
-export interface RobloxProfile extends Record<string, any> {
+export interface RobloxProfile extends Record<string, unknown> {
 	/** the user's id */
 	sub: string;
 	/** the user's username */
-	preferred_username: string;
+	preferred_username?: string | undefined;
 	/** the user's display name, will return the same value as the preferred_username if not set */
-	nickname: string;
+	nickname?: string | undefined;
 	/** the user's display name, again, will return the same value as the preferred_username if not set */
-	name: string;
+	name?: string | undefined;
 	/** the account creation date as a unix timestamp in seconds */
-	created_at: number;
+	created_at?: number | undefined;
 	/** the user's profile URL */
-	profile: string;
+	profile?: string | undefined;
 	/** the user's avatar URL */
-	picture: string;
+	picture?: string | null | undefined;
 }
 
 export interface RobloxOptions extends ProviderOptions<RobloxProfile> {
@@ -101,7 +101,7 @@ export const roblox = (options: RobloxOptions) => {
 			return {
 				user: {
 					name: profile.nickname || profile.preferred_username || "",
-					image: profile.picture,
+					image: profile.picture ?? undefined,
 					email: createPlaceholderEmail({
 						identifier: profile.sub,
 						namespace: "roblox",