diff --git a/litecord/blueprints/auth.py b/litecord/blueprints/auth.py
index 493d96c..17e77f3 100644
--- a/litecord/blueprints/auth.py
+++ b/litecord/blueprints/auth.py
@@ -43,15 +43,35 @@ def make_token(user_id, user_pwd_hash) -> str:
     return signer.sign(user_id).decode()
 
 
+async def check_username_usage(username: str):
+    """Raise an error if too many people are with the same username."""
+    same_username = await app.db.fetchval("""
+    SELECT COUNT(*)
+    FROM users
+    WHERE username = $1
+    """, username)
+
+    if same_username > 8000:
+        raise BadRequest('Too many people.', {
+            'username': 'Too many people used the same username. '
+                        'Please choose another'
+        })
+
+
 @bp.route('/register', methods=['POST'])
 async def register():
     j = await request.get_json()
     email, password, username = j['email'], j['password'], j['username']
 
     new_id = get_snowflake()
+
     new_discrim = str(random.randint(1, 9999))
+    new_discrim = '%04d' % new_discrim
+
     pwd_hash = await hash_data(password)
 
+    await check_username_usage(username)
+
     try:
         await app.db.execute("""
         INSERT INTO users (id, email, username,
diff --git a/litecord/blueprints/users.py b/litecord/blueprints/users.py
index a5670cc..f1b094f 100644
--- a/litecord/blueprints/users.py
+++ b/litecord/blueprints/users.py
@@ -1,13 +1,17 @@
+import random
+
 from quart import Blueprint, jsonify, request, current_app as app
 from asyncpg import UniqueViolationError
 
 from ..auth import token_check
 from ..snowflake import get_snowflake
-from ..errors import Forbidden, BadRequest
-from ..schemas import validate, USER_SETTINGS, CREATE_DM, CREATE_GROUP_DM
+from ..errors import Forbidden, BadRequest, Unauthorized
+from ..schemas import validate, USER_SETTINGS, \
+    CREATE_DM, CREATE_GROUP_DM, USER_UPDATE
 from ..enums import ChannelType, RelationshipType
 
 from .guilds import guild_check
+from .auth import hash_data, check_password, check_username_usage
 
 bp = Blueprint('user', __name__)
 
@@ -37,28 +41,157 @@ async def get_other(target_id):
     return jsonify(other)
 
 
+async def _try_reroll(user_id, preferred_username: str = None):
+    for _ in range(10):
+        reroll = str(random.randint(1, 9999))
+
+        if preferred_username:
+            existing_uid = await app.db.fetchrow("""
+            SELECT user_id
+            FROM users
+            WHERE preferred_username = $1 AND discriminator = $2
+            """, preferred_username, reroll)
+
+            if not existing_uid:
+                return reroll
+
+            continue
+
+        try:
+            await app.db.execute("""
+            UPDATE users
+            SET discriminator = $1
+            WHERE users.id = $2
+            """, reroll, user_id)
+
+            return reroll
+        except UniqueViolationError:
+            continue
+
+    return
+
+
+async def _try_username_patch(user_id, new_username: str) -> str:
+    await check_username_usage(new_username)
+    discrim = None
+
+    try:
+        await app.db.execute("""
+        UPDATE users
+        SET username = $1
+        WHERE users.id = $2
+        """, new_username, user_id)
+
+        return await app.db.fetchval("""
+        SELECT discriminator
+        FROM users
+        WHERE users.id = $1
+        """, user_id)
+    except UniqueViolationError:
+        discrim = await _try_reroll(user_id, new_username)
+
+        if not discrim:
+            raise BadRequest('Unable to change username', {
+                'username': 'Too many people are with this username.'
+            })
+
+        await app.db.execute("""
+        UPDATE users
+        SET username = $1, discriminator = $2
+        WHERE users.id = $3
+        """, new_username, discrim, user_id)
+
+    return discrim
+
+
+async def _try_discrim_patch(user_id, new_discrim: str):
+    try:
+        await app.db.execute("""
+        UPDATE users
+        SET discriminator = $1
+        WHERE id = $2
+        """, new_discrim, user_id)
+    except UniqueViolationError:
+        raise BadRequest('Invalid discriminator', {
+            'discriminator': 'Someone already used this discriminator.'
+        })
+
+
+def to_update(j: dict, user: dict, field: str):
+    return field in j and j[field] and j[field] != user[field]
+
+
+async def _check_pass(j, user):
+    if not j['password']:
+        raise BadRequest('password required', {
+            'password': 'password required'
+        })
+
+    phash = user['password_hash']
+
+    if not await check_password(phash, j['password']):
+        raise BadRequest('password incorrect', {
+            'password': 'password does not match.'
+        })
+
+
 @bp.route('/@me', methods=['PATCH'])
 async def patch_me():
     """Patch the current user's information."""
     user_id = await token_check()
-    j = await request.get_json()
-
-    if not isinstance(j, dict):
-        raise BadRequest('Invalid payload')
 
+    j = validate(await request.get_json(), USER_UPDATE)
     user = await app.storage.get_user(user_id, True)
 
-    if 'username' in j:
-        try:
-            await app.db.execute("""
-            UPDATE users
-            SET username = $1
-            WHERE users.id = $2
-            """, j['username'], user_id)
-        except UniqueViolationError:
-            raise BadRequest('Username already used.')
+    user['password_hash'] = await app.db.fetchval("""
+    SELECT password_hash
+    FROM users
+    WHERE id = $1
+    """, user_id)
 
+    if to_update(j, user, 'username'):
+        # this will take care of regenning a new discriminator
+        discrim = await _try_username_patch(user_id, j['username'])
         user['username'] = j['username']
+        user['discriminator'] = discrim
+
+    if to_update(j, user, 'discriminator'):
+        # the API treats discriminators as integers,
+        # but I work with strings on the database.
+        new_discrim = str(j['discriminator'])
+
+        await _try_discrim_patch(user_id, new_discrim)
+        user['discriminator'] = new_discrim
+
+    if to_update(j, user, 'email'):
+        await _check_pass(j, user)
+
+        # TODO: reverify the new email?
+        await app.db.execute("""
+        UPDATE users
+        SET email = $1
+        WHERE id = $2
+        """, j['email'], user_id)
+        user['email'] = j['email']
+
+    if 'avatar' in j:
+        # TODO: update icon
+        pass
+
+    if 'new_password' in j and j['new_password']:
+        await _check_pass(j, user)
+
+        new_hash = await hash_data(j['new_password'])
+
+        await app.db.execute("""
+        UPDATE users
+        SET password_hash = $1
+        WHERE id = $2
+        """, new_hash, user_id)
+
+    # TODO: dispatch USER_UPDATE to guilds and users
+    await app.dispatcher.dispatch_user(
+        user_id, 'USER_UPDATE', user)
 
     return jsonify(user)
 
diff --git a/litecord/enums.py b/litecord/enums.py
index 99cc0e2..edc580b 100644
--- a/litecord/enums.py
+++ b/litecord/enums.py
@@ -1,5 +1,3 @@
-import ctypes
-
 from enum import Enum
 
 
@@ -46,28 +44,28 @@ class MessageActivityType(EasyEnum):
     JOIN_REQUEST = 5
 
 
-uint8 = ctypes.c_uint8
+class ActivityFlags:
+    instance = 1
+    join = 2
+    spectate = 4
+    join_request = 8
+    sync = 16
+    play = 32
 
 
-# use ctypes to interpret the bits in activity flags
-class ActivityFlagsBits(ctypes.LittleEndianStructure):
-    _fields_ = [
-        ('instance', uint8, 1),
-        ('join', uint8, 1),
-        ('spectate', uint8, 1),
-        ('join_request', uint8, 1),
-        ('sync', uint8, 1),
-        ('play', uint8, 1),
-    ]
+class UserFlags:
+    staff = 1
+    partner = 2
+    hypesquad = 4
+    bug_hunter = 8
+    mfa_sms = 16
+    premium_dismissed = 32
 
+    hsquad_house_1 = 64
+    hsquad_house_2 = 128
+    hsquad_house_3 = 256
 
-class ActivityFlags(ctypes.Union):
-    _anonymous_ = ('bit',)
-
-    _fields_ = [
-        ('bit', ActivityFlagsBits),
-        ('as_byte', uint8),
-    ]
+    premium_early = 512
 
 
 class StatusType(EasyEnum):
diff --git a/litecord/schemas.py b/litecord/schemas.py
index a6f30dd..556b84a 100644
--- a/litecord/schemas.py
+++ b/litecord/schemas.py
@@ -12,6 +12,7 @@ log = Logger(__name__)
 USERNAME_REGEX = re.compile(r'^[a-zA-Z0-9_]{2,19}$', re.A)
 EMAIL_REGEX = re.compile(r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$',
                          re.A)
+DATA_REGEX = re.compile(r'data\:image/(png|jpeg|gif);base64,(.+)', re.A)
 
 
 # collection of regexes
@@ -27,6 +28,24 @@ class LitecordValidator(Validator):
         """Validate against the username regex."""
         return bool(USERNAME_REGEX.match(value))
 
+    def _validate_type_email(self, value: str) -> bool:
+        """Validate against the username regex."""
+        return bool(EMAIL_REGEX.match(value))
+
+    def _validate_type_b64_icon(self, value: str) -> bool:
+        return bool(DATA_REGEX.match(value))
+
+    def _validate_type_discriminator(self, value: str) -> bool:
+        """Discriminators are numbers in the API
+        that can go from 0 to 9999.
+        """
+        try:
+            discrim = int(value)
+        except (TypeError, ValueError):
+            return False
+
+        return 0 < discrim <= 9999
+
     def _validate_type_snowflake(self, value: str) -> bool:
         try:
             int(value)
@@ -82,6 +101,43 @@ def validate(reqjson, schema, raise_err: bool = True):
     return validator.document
 
 
+USER_UPDATE = {
+    'username': {
+        'type': 'username', 'minlength': 2,
+        'maxlength': 30, 'required': False},
+
+    'discriminator': {
+        'type': 'discriminator',
+        'required': False,
+        'nullable': True,
+    },
+
+    'password': {
+        'type': 'string', 'minlength': 0,
+        'maxlength': 100, 'required': False,
+    },
+
+    'new_password': {
+        'type': 'string', 'minlength': 5,
+        'maxlength': 100, 'required': False,
+        'dependencies': 'password',
+        'nullable': True
+    },
+
+    'email': {
+        'type': 'string', 'minlength': 2,
+        'maxlength': 30, 'required': False,
+        'dependencies': 'password',
+    },
+
+    'avatar': {
+        'type': 'b64_icon', 'required': False,
+        'nullable': True
+    },
+
+}
+
+
 GUILD_UPDATE = {
     'name': {
         'type': 'string',
@@ -297,5 +353,5 @@ CREATE_GROUP_DM = {
 
 SPECIFIC_FRIEND = {
     'username': {'type': 'username'},
-    'discriminator': {'type': 'number'}
+    'discriminator': {'type': 'discriminator'}
 }
diff --git a/litecord/storage.py b/litecord/storage.py
index 307acd3..b6ae49e 100644
--- a/litecord/storage.py
+++ b/litecord/storage.py
@@ -96,6 +96,9 @@ class Storage:
 
         duser = dict(user_row)
 
+        duser['mobile'] = False
+        duser['phone'] = None
+
         duser['premium'] = duser['premium_since'] is not None
         duser.pop('premium_since')