diff --git a/fastapi_users_tortoise/__init__.py b/fastapi_users_tortoise/__init__.py
index e2e40f2..089ecd2 100644
--- a/fastapi_users_tortoise/__init__.py
+++ b/fastapi_users_tortoise/__init__.py
@@ -1,15 +1,30 @@
 """FastAPI Users database adapter for Tortoise ORM."""
 from typing import Any, Dict, Generic, Optional, Type, TypeVar, cast
+import re
 from uuid import UUID
 
 from fastapi_users.db.base import BaseUserDatabase
 from fastapi_users.models import ID, OAP
 from tortoise import fields, models
-from tortoise.exceptions import DoesNotExist
+from tortoise.exceptions import DoesNotExist, ValidationError
+from tortoise.timezone import now
+from tortoise.validators import RegexValidator
 
 __version__ = "0.2.0"
 
 
+class UsernameValidator(RegexValidator):
+    def __init__(self):
+        pattern = r"^[\w.@+-]+\Z"
+        super().__init__(pattern, 0)
+
+    def __call__(self, value: Any):
+        if not self.regex.match(value):
+            raise ValidationError(
+                "Username must only container letters, numbers, and @/./+/-/_ characters."
+            )
+
+
 class TortoiseBaseUserAccountModel(models.Model):
     """Base Tortoise ORM users model definition."""
 
@@ -19,12 +34,36 @@ class User(TortoiseBaseUserAccountModel[uuid.UUID]):
       so using generics here to specify the id ID is pointless.
       """
 
+    username_validator = UsernameValidator()
+
     id: Any
-    email: str = fields.CharField(index=True, unique=True, null=False, max_length=255)
+    first_name = fields.CharField(null=True, max_length=150)
+    last_name = fields.CharField(null=True, max_length=150)
+    username = fields.CharField(
+        null=True, unique=True, max_length=50, validators=[username_validator]
+    )
+    email: str = fields.CharField(
+        index=True,
+        unique=True,
+        null=False,
+        max_length=255,
+    )
     hashed_password: str = fields.CharField(null=False, max_length=1024)
     is_active = fields.BooleanField(default=True, null=False)
     is_superuser = fields.BooleanField(default=False, null=False)
     is_verified = fields.BooleanField(default=False, null=False)
+    date_joined = fields.DatetimeField(default=now)
+
+    def full_name(self):
+        """
+        return first_name and last_name
+        """
+        full_name = f"{self.first_name} {self.last_name}"
+        return full_name.strip()
+
+    class PydanticMeta:
+        computed = ["full_name"]
+        exclude = ["hashed_password"]
 
     class Meta:
         abstract = True
diff --git a/tests/test_users.py b/tests/test_users.py
index 9438d6b..9e08af4 100644
--- a/tests/test_users.py
+++ b/tests/test_users.py
@@ -3,6 +3,7 @@
 
 import pytest
 from tortoise import Tortoise, fields
+from tortoise.exceptions import ValidationError
 
 from fastapi_users_tortoise import (
     TortoiseBaseUserAccountModelUUID,
@@ -37,7 +38,9 @@ async def tortoise_user_db() -> AsyncGenerator[TortoiseUserDatabase[User, UUID],
 
 
 @pytest.fixture
-async def tortoise_user_db_oauth() -> AsyncGenerator[TortoiseUserDatabase[User, UUID], None]:
+async def tortoise_user_db_oauth() -> AsyncGenerator[
+    TortoiseUserDatabase[User, UUID], None
+]:
     DATABASE_URL = "sqlite://./test-tortoise-user-oauth.db"
 
     await Tortoise.init(
@@ -68,10 +71,22 @@ async def test_queries(
     assert user.is_active is True
     assert user.is_superuser is False
     assert user.email == user_create["email"]
+    assert user.first_name is None
+    assert user.last_name is None
+    assert user.username is None
+    assert user.date_joined is not None
 
     # Update
     updated_user = await tortoise_user_db.update(user, {"is_superuser": True})
     assert updated_user.is_superuser is True
+    
+    # update first and last name
+    first_name = "Lancelot"
+    last_name = "Camelot"
+    updated_user = await tortoise_user_db.update(user, {"first_name": first_name, "last_name": last_name})
+    assert updated_user.first_name == first_name
+    assert updated_user.last_name == last_name
+    assert updated_user.full_name() == f"{first_name} {last_name}"
 
     # Get by id
     id_user = await tortoise_user_db.get(user.id)
@@ -236,3 +251,20 @@ async def test_queries_oauth(
     # Unknown OAuth account
     unknown_oauth_user = await tortoise_user_db_oauth.get_by_oauth_account("foo", "bar")
     assert unknown_oauth_user is None
+
+
+@pytest.mark.asyncio
+async def test_username_validation(tortoise_user_db: TortoiseUserDatabase[User, UUID]):
+    user_create = {
+        "username": "lancee007",
+        "email": "lancelot@camelot.bt",
+        "hashed_password": "guinevere",
+    }
+
+    # Create
+    user = await tortoise_user_db.create(user_create)
+    assert user.username == user_create["username"]
+    
+    # update to invalid
+    with pytest.raises(ValidationError):
+        await tortoise_user_db.update(user, {"username": "lance&lot"})
\ No newline at end of file