diff --git a/game_data/migrations/0006_playerprofile_class_name.py b/game_data/migrations/0006_playerprofile_class_name.py
new file mode 100644
index 0000000..5c0a961
--- /dev/null
+++ b/game_data/migrations/0006_playerprofile_class_name.py
@@ -0,0 +1,25 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('game_data', '0005_merge_20260505_1640'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='playerprofile',
+            name='class_name',
+            field=models.CharField(
+                choices=[
+                    ('adventurer', 'Adventurer'),
+                    ('mage', 'Mage'),
+                    ('archer', 'Archer'),
+                    ('warrior', 'Warrior'),
+                ],
+                default='adventurer',
+                max_length=16,
+            ),
+        ),
+    ]
diff --git a/game_data/models.py b/game_data/models.py
index ef5da95..cd9338c 100644
--- a/game_data/models.py
+++ b/game_data/models.py
@@ -8,6 +8,19 @@
 
 
 class PlayerProfile(models.Model):
+
+    CLASS_ADVENTURER = 'adventurer'
+    CLASS_MAGE       = 'mage'
+    CLASS_ARCHER     = 'archer'
+    CLASS_WARRIOR    = 'warrior'
+
+    CLASS_CHOICES = [
+        (CLASS_ADVENTURER, 'Adventurer'),
+        (CLASS_MAGE,       'Mage'),
+        (CLASS_ARCHER,     'Archer'),
+        (CLASS_WARRIOR,    'Warrior'),
+    ]
+
     user = models.OneToOneField(
         User,
         on_delete=models.CASCADE,
@@ -19,6 +32,13 @@ class PlayerProfile(models.Model):
     hp_current = models.PositiveIntegerField(default=100)
     gold = models.PositiveIntegerField(default=100)
 
+    # Player class — determines available skills and sprite set.
+    class_name = models.CharField(
+        max_length=16,
+        choices=CLASS_CHOICES,
+        default=CLASS_ADVENTURER,
+    )
+
     # Currently equipped items keyed by slot (head, body, arms, legs, shoes, weapon).
     equipped_items = models.JSONField(default=dict, blank=True)
 
@@ -34,7 +54,7 @@ class Meta:
         ordering = ['user_id']
 
     def __str__(self) -> str:
-        return f"{self.user.username} L{self.level} HP {self.hp_current}/{self.hp_max}"
+        return f"{self.user.username} L{self.level} HP {self.hp_current}/{self.hp_max} [{self.class_name}]"
 
 
 class PlayerSkill(models.Model):
diff --git a/game_data/serializers.py b/game_data/serializers.py
index 65877bd..5cfea35 100644
--- a/game_data/serializers.py
+++ b/game_data/serializers.py
@@ -71,6 +71,7 @@ class Meta:
             'hp_max',
             'hp_current',
             'gold',
+            'class_name',
             'inventory_items',
             'discarded_items',
             'equipped_items',
@@ -93,6 +94,10 @@ class PlayerProfileUpdateSerializer(serializers.Serializer):
     hp_max = serializers.IntegerField(required=False, min_value=1)
     hp_current = serializers.IntegerField(required=False, min_value=0)
     gold = serializers.IntegerField(required=False, min_value=0)
+    class_name = serializers.ChoiceField(
+        choices=[c[0] for c in PlayerProfile.CLASS_CHOICES],
+        required=False,
+    )
     skills = PlayerSkillSerializer(many=True, required=False)
     inventory_items = serializers.ListField(
         child=serializers.DictField(),
diff --git a/game_data/views.py b/game_data/views.py
index 8d5bd29..bd92e63 100644
--- a/game_data/views.py
+++ b/game_data/views.py
@@ -109,36 +109,19 @@ def patch(self, request: Request) -> Response:
 
         with transaction.atomic():
             session_id = validated.get('session_id')
-            sequence = validated.get('sequence')
-
-            if session_id:
-                if profile.active_session_id != session_id:
-                    profile.active_session_id = session_id
-                    profile.last_sequence = 0
-
-        for field in (
-            'level',
-            'experience',
-            'hp_max',
-            'hp_current',
-            'gold',
-            'inventory_items',
-            'discarded_items',
-            'equipped_items',
-        ):
-            if field in validated:
-                setattr(profile, field, validated[field])
-
-            for field in (
-                'level',
-                'experience',
-                'hp_max',
-                'hp_current',
-                'gold',
-            ):
+            sequence   = validated.get('sequence')
+
+            # Reset sequence counter when a new session starts.
+            if session_id and profile.active_session_id != session_id:
+                profile.active_session_id = session_id
+                profile.last_sequence = 0
+
+            # Apply simple scalar fields directly onto the profile.
+            for field in ('level', 'experience', 'hp_max', 'hp_current', 'gold', 'class_name', 'equipped_items'):
                 if field in validated:
                     setattr(profile, field, validated[field])
 
+            # Sync inventory and discarded items.
             if 'inventory_items' in validated or 'discarded_items' in validated:
                 _sync_profile_items(
                     profile,
@@ -146,6 +129,7 @@ def patch(self, request: Request) -> Response:
                     discarded_items=validated.get('discarded_items'),
                 )
 
+            # Replace skills list.
             if 'skills' in validated:
                 PlayerSkill.objects.filter(player_profile=profile).delete()
                 for index, skill in enumerate(validated['skills']):
@@ -157,6 +141,7 @@ def patch(self, request: Request) -> Response:
                         display_order=skill.get('display_order', index),
                     )
 
+            # Guard: hp_current must never exceed hp_max.
             if profile.hp_current > profile.hp_max:
                 profile.hp_current = profile.hp_max
 
@@ -169,6 +154,7 @@ def patch(self, request: Request) -> Response:
         output['ignored'] = False
         return Response(output, status=status.HTTP_200_OK)
 
+
     @staticmethod
     def _get_or_create_profile(user):
         profile, created = PlayerProfile.objects.get_or_create(user=user)