diff --git a/packages/backend/src/lib/auth.ts b/packages/backend/src/lib/auth.ts
index 95218db..2e90208 100644
--- a/packages/backend/src/lib/auth.ts
+++ b/packages/backend/src/lib/auth.ts
@@ -14,7 +14,7 @@ const logger = new Logger("Lib | auth.ts");
 
 const Authorization: FastifyPluginCallback = (fastify) => {
   fastify.addHook("onRequest", async (req, res) => {
-    const token = req.headers["authorization"];
+    let token = req.headers["authorization"];
     if (typeof token !== "string") {
       return req.token = ErrorBase({
         bad: "client",
@@ -23,6 +23,18 @@ const Authorization: FastifyPluginCallback = (fastify) => {
       });
     }
 
+    if (!token.startsWith("Bearer ")) {
+      req.token = ErrorBase({
+        bad: "client",
+        code: "token_invalid",
+        message: "トークンが不正です。",
+      });
+
+      return;
+    }
+
+    token = token.replace("Bearer ", "");
+
     try {
       const result = await fastify.orm.em.getRepository(TokenEntity).authToken(token);
       
diff --git a/packages/backend/src/lib/id.ts b/packages/backend/src/lib/id.ts
new file mode 100644
index 0000000..3570111
--- /dev/null
+++ b/packages/backend/src/lib/id.ts
@@ -0,0 +1,13 @@
+import { randomBytes } from "node:crypto";
+
+export default function generateUniqueId(length = 10) {
+  const guide = Math.ceil(length * 5 / 8);
+  const bytes = randomBytes(guide);
+  const bigint = BigInt("0x" + bytes.toString("hex"));
+
+  let id = bigint.toString(36);
+  id = id.padStart(length, "0")
+  id = id.slice(-length);
+
+  return id;
+}
\ No newline at end of file
diff --git a/packages/backend/src/modules/entities/User.ts b/packages/backend/src/modules/entities/User.ts
index db8205a..c2b367c 100644
--- a/packages/backend/src/modules/entities/User.ts
+++ b/packages/backend/src/modules/entities/User.ts
@@ -1,6 +1,6 @@
 import { Entity, EntityRepositoryType, OptionalProps, PrimaryKey, Property } from "@mikro-orm/core";
 import { UserRepository } from "@/modules/repositories/User";
-import { v4 as uuid } from "uuid";
+import generateUniqueId from "@/lib/id";
 
 @Entity({
   tableName: "user",
@@ -8,13 +8,14 @@ import { v4 as uuid } from "uuid";
 })
 export class UserEntity {
   [EntityRepositoryType]?: UserRepository;
-  [OptionalProps]?: "uuid" | "isSuspended" | "createdAt";
+  [OptionalProps]?: "profile" | "isSuspended" | "createdAt";
 
   @PrimaryKey({
     type: "string",
-    length: 36
+    length: 10,
+    onCreate: () => generateUniqueId(),
   })
-  uuid: string = uuid();
+  id!: string;
 
   @Property({
     type: "string",
@@ -29,6 +30,13 @@ export class UserEntity {
   })
   username!: string;
 
+  @Property({
+    type: "string",
+    length: 4096,
+    default: "",
+  })
+  profile!: string;
+
   @Property({
     type: "string",
     unique: true,
@@ -52,7 +60,7 @@ export class UserEntity {
   isSuspended: boolean = false;
 
   @Property({
-    type: "date",
+    type: "datetime",
     onCreate: () => new Date(),
   })
   createdAt!: Date;
diff --git a/packages/backend/src/modules/repositories/User.ts b/packages/backend/src/modules/repositories/User.ts
index 1ec10f4..8fbe742 100644
--- a/packages/backend/src/modules/repositories/User.ts
+++ b/packages/backend/src/modules/repositories/User.ts
@@ -8,12 +8,13 @@ export class UserRepository extends EntityRepository<UserEntity> {
   public static schema = z.object({
     userid: z.string().trim().min(3).max(20),
     username: z.string().trim().min(3).max(30),
+    profile: z.string().max(4096).optional(),
     email: z.string().min(6).trim().max(254).regex(EmailRegex),
     password: z.string().trim().min(8),
     isAdmin: z.boolean(),
   });
 
-  async createUser(data: z.infer<typeof UserRepository.schema>) {
+  async createUser(data: Pick<z.infer<typeof UserRepository.schema>, "userid" | "email" | "password" | "isAdmin">) {
     const hashed = await hash(data.password, {
       type: argon2id,
       memoryCost: 2 ** 16,
@@ -23,6 +24,7 @@ export class UserRepository extends EntityRepository<UserEntity> {
 
     const user = this.create({
       ...data,
+      username: data.userid,
       password: hashed,
     });
 
diff --git a/packages/backend/src/routes/me/index.ts b/packages/backend/src/routes/me/index.ts
index ffac7a6..c345b53 100644
--- a/packages/backend/src/routes/me/index.ts
+++ b/packages/backend/src/routes/me/index.ts
@@ -6,6 +6,9 @@ export default async function Me(fastify: FastifyInstance) {
       return res.code(400).send(req.token);
 
     const { password, email, ...safeUser } = req.token.user;
-    return res.send(safeUser);
+    return res.send({
+      ...safeUser,
+      success: true,
+    });
   });
 }
diff --git a/packages/backend/src/routes/primary/signup.ts b/packages/backend/src/routes/primary/signup.ts
index a7c56d5..3bbf758 100644
--- a/packages/backend/src/routes/primary/signup.ts
+++ b/packages/backend/src/routes/primary/signup.ts
@@ -10,19 +10,42 @@ export default function SignUp(fastify: FastifyInstance) {
 	fastify.post("/", async (req, res) => {
     res.header("Content-Type", "application/json");
 
-    const result = UserRepository.schema.safeParse(req.body);
+    const result = UserRepository.schema.pick({
+      userid: true,
+      email: true,
+      password: true,
+    }).safeParse(req.body);
 
     if (!result.success) {
+      console.log(result.error.issues)
       return res.code(400).send(InputError(result.error.issues));
     }
  
     try {
-      await fastify.orm.em.getRepository(UserEntity).createUser(result.data);
+      await fastify.orm.em.getRepository(UserEntity).createUser({
+        ...result.data,
+        isAdmin: false,
+      });
 
       return res.code(200).send({
         success: true,
       });
-    } catch (err) {
+    } catch (err: any) {
+      if (err.name === "UniqueConstraintViolationException") {
+        const duplicate = err.constraint.replace("user_", "").replace("_unique", "");
+
+        if (duplicate !== "id") {
+          return res.code(400).send(InputError([
+            {
+              validation: "regex",
+              code: "invalid_string",
+              message: "Duplicate",
+              path: [duplicate]
+            }
+          ]))
+        }
+      }
+
       logger.error("Database Error: User create failed.", err);
 
       return res.code(500).send(DatabaseError());
diff --git a/packages/backend/src/routes/setup/create-admin.ts b/packages/backend/src/routes/setup/create-admin.ts
index 4cec9f6..91eba84 100755
--- a/packages/backend/src/routes/setup/create-admin.ts
+++ b/packages/backend/src/routes/setup/create-admin.ts
@@ -3,6 +3,7 @@ import Logger from "@/lib/logger";
 import type { FastifyInstance } from "fastify";
 import { UserRepository } from "@/modules/repositories/User";
 import { DatabaseError, ErrorBase, InputError } from "@/errors";
+import { UniqueConstraintViolationException } from "@mikro-orm/core";
 
 export default function CreateAdmin(fastify: FastifyInstance) {
   const logger = new Logger("Endpoint | setup/create-admin");
@@ -10,7 +11,11 @@ export default function CreateAdmin(fastify: FastifyInstance) {
   fastify.post("/", async (req, res) => {
     res.header("Content-Type", "application/json");
 
-    const result = UserRepository.schema.omit({ isAdmin: true }).safeParse(req.body);
+    const result = UserRepository.schema.pick({
+      userid: true,
+      email: true,
+      password: true,
+    }).safeParse(req.body);
 
     if (!result.success) {
       return res.code(400).send(InputError(result.error.issues));
@@ -38,7 +43,7 @@ export default function CreateAdmin(fastify: FastifyInstance) {
         isAdmin: true,
       });
 
-      logger.warn("First administrator account has been created.")
+      logger.warn("First administrator account has been created.");
 
       return res.code(200).send({
         success: true,
diff --git a/packages/backend/src/routes/setup/initialization.ts b/packages/backend/src/routes/setup/initialization.ts
index 5330345..2fef43b 100644
--- a/packages/backend/src/routes/setup/initialization.ts
+++ b/packages/backend/src/routes/setup/initialization.ts
@@ -48,7 +48,7 @@ export default function Initialization(fastify: FastifyInstance) {
       const entries = Object.entries(result.data).filter(([key]) => key !== "force");
       
       for (const [key, value] of entries) {
-        const entity = fastify.orm.em.getRepository(ConfigEntity).set(
+        const entity = await fastify.orm.em.getRepository(ConfigEntity).set(
           key,
           typeof value === "string"
             ? value
diff --git a/packages/lynqchat-js/src/1.0.0-alpha.0/api/me/index.d.ts b/packages/lynqchat-js/src/1.0.0-alpha.0/api/me/index.d.ts
index f07f85a..765632b 100644
--- a/packages/lynqchat-js/src/1.0.0-alpha.0/api/me/index.d.ts
+++ b/packages/lynqchat-js/src/1.0.0-alpha.0/api/me/index.d.ts
@@ -3,10 +3,12 @@ import ErrorBase from "../../modules/error";
 import DatabaseError from "../../modules/error/database";
 import Success from "../../modules/response/success";
 import YetInitializationError from "../../modules/error/yet_init";
+import UserSchema from "../../modules/user";
 
 export default interface Me {
   "me": {
     body: never;
-    response: Success | DatabaseError | InputError | InputNoneError | YetInitializationError;
+    response: (Success & Omit<UserSchema, "password" | "email">)
+      | DatabaseError | InputError | InputNoneError | YetInitializationError;
   };
 }
\ No newline at end of file
diff --git a/packages/lynqchat-js/src/1.0.0-alpha.0/api/primary/signup.d.ts b/packages/lynqchat-js/src/1.0.0-alpha.0/api/primary/signup.d.ts
index 75c02ac..e80ba94 100644
--- a/packages/lynqchat-js/src/1.0.0-alpha.0/api/primary/signup.d.ts
+++ b/packages/lynqchat-js/src/1.0.0-alpha.0/api/primary/signup.d.ts
@@ -7,7 +7,7 @@ import UserSchema from "../../modules/user";
 
 export default interface PrimarySignup {
   "primary/signup": {
-    body: UserSchema;
+    body: Pick<UserSchema, "userid" | "email" | "password">;
     response: Success | DatabaseError | InputError | InputNoneError | YetInitializationError;
   };
 }
\ No newline at end of file
diff --git a/packages/lynqchat-js/src/1.0.0-alpha.0/api/setup/create-admin.d.ts b/packages/lynqchat-js/src/1.0.0-alpha.0/api/setup/create-admin.d.ts
index 501e46e..9837296 100644
--- a/packages/lynqchat-js/src/1.0.0-alpha.0/api/setup/create-admin.d.ts
+++ b/packages/lynqchat-js/src/1.0.0-alpha.0/api/setup/create-admin.d.ts
@@ -7,7 +7,7 @@ import { UserSchema } from "../primary/signup";
 
 export default interface SetupCreateAdmin {
   "setup/create-admin": {
-    body: UserSchema;
+    body: Pick<UserSchema, "userid" | "email" | "password">;
     response: Success | DatabaseError | ErrorBase<{
       bad: "client",
       code: "first_admin_already_exists",
diff --git a/packages/lynqchat-js/src/1.0.0-alpha.0/modules/user.d.ts b/packages/lynqchat-js/src/1.0.0-alpha.0/modules/user.d.ts
index 3d89d48..5b152c6 100644
--- a/packages/lynqchat-js/src/1.0.0-alpha.0/modules/user.d.ts
+++ b/packages/lynqchat-js/src/1.0.0-alpha.0/modules/user.d.ts
@@ -1,6 +1,10 @@
 export default interface UserSchema {
   userid: string;
   username: string;
+  profile: string;
   email: string;
   password: string;
+  isSuspended: boolean;
+  isAdmin: boolean;
+  createdAt: string;
 }
\ No newline at end of file