Ya se puede hacer un filtro por género a través del end point:

/api/marvel/v1/characters/?gener=x donde x puede tormar los valores:
v = Villians
h = Heroes

marvel/core/filters.py

@@ -0,0 +1,9 @@
+from django_filters import rest_framework as filters
+
+from .models import Character
+
+
+class CharacterFilter(filters.FilterSet):
+	class Meta:
+		model = Character
+		fields = ('gener',)

marvel/core/migrations/0002_auto_20200817_1753.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1 on 2020-08-17 21:53
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='character',
+            name='gener',
+            field=models.CharField(choices=[('h', 'Heroes'), ('v', 'Villians')], max_length=2),
+        ),
+    ]

marvel/core/models.py

@@ -1,10 +1,11 @@
 from django.db import models
+from django.urls import reverse
 
 
 class Character(models.Model):
 	GENERS = (
 		('h', 'Heroes'),
-		('m', 'Villians')
+		('v', 'Villians')
 	)
 	name = models.CharField(max_length=80)
 	real_name = models.CharField(max_length=30)
@@ -13,3 +14,9 @@ class Character(models.Model):
 
 	def __str__(self):
 		return self.name
+
+	def get_absolute_url(self):
+		return reverse(
+			'core:character-detail',
+			kwargs={'pk': self.pk}
+		)

marvel/core/tests/test_views.py

@@ -31,6 +31,20 @@ def test_if_i_not_create_a_character_the_list_should_be_empty(self):
 
 		self.assertEqual(0, response.data['count'])
 
+	def test_get_all_characters_by_gener(self):
+
+		CharacterFactory.create(
+			name="Hulk",
+			real_name="Brust Banner",
+			gener='h',
+			origin='Se expuso a rayos gammas'
+		)
+		self.url = '/api/marvel/v1/characters/?gener=h'
+
+		response = self.client.get(self.url)
+
+		self.assertEqual(1, response.data['count'])
+
 
 class CharacterDetailAPIVIewTest(APITestCase):
 
@@ -42,9 +56,8 @@ def test_i_can_to_see_detail_of_character(self):
 			gener='h',
 			origin='Se expuso a rayos gammas'
 		)
-		url = reverse('core:character-detail', kwargs={'pk': hulk.pk})
 
-		response = self.client.get(url)
+		response = self.client.get(hulk.get_absolute_url())
 
 		self.assertTrue(status.is_success(response.status_code))
 

marvel/core/views.py

@@ -1,10 +1,11 @@
 from rest_framework import generics
 
+from .filters import CharacterFilter
 from .mixins import CharacterMixinAPIView
 
 
 class CharacterListAPIView(CharacterMixinAPIView, generics.ListAPIView):
-	pass
+	filterset_class = CharacterFilter
 
 
 class CharacterDetailAPIView(CharacterMixinAPIView, generics.RetrieveAPIView):