The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Carson (11 members)
- Catcatcat6 (1 member)
- Category setting templates (4 members)
- Cerasus (4 members)
- Cerasus Characters (20 members)
- Cerasus Collectibles (2 members)
- Cerasus Events (2 members)
- Cerasus Guides (4 members)
- Cerasus Locations (56 members)
- Character Pictures (304 members)
- Character templates (9 members)
- Characters (200 members)
- Cheo (7 members)
- Chonixtu (10 members)
- Colby (9 members)
- Collectables (0 members)
- Collective Unconscious (7 members)
- Collective Unconscious Annotated Maps (2 members)
- Collective Unconscious Authors (61 members)
- Collective Unconscious BGM (65 members)
- Collective Unconscious Character Images (5 members)
- Collective Unconscious Characters (2 members)
- Collective Unconscious Collectables (5 members)
- Collective Unconscious Guides (13 members)
- Collective Unconscious Images (2 members)
- Collective Unconscious Locations (251 members)
- Collective Unconscious Maps (2 members)
- Collective Unconscious Nexus Worlds (12 members)
- Collective Unconscious Picture Files (1 member)
- Collective Unconscious Screenshots (145 members)
- Colour (1 member)
- Concertalyis (1 member)
- Connection templates (10 members)
- Content (51 members)
- Counter Templates (0 members)
- Counter templates (8 members)
- Cyber-Rainforce (1 member)
- Dedp (41 members)
- Deep Dreams (5 members)
- Deep Dreams Characters (6 members)
- Deep Dreams Characters With Official Names (5 members)
- Deep Dreams Guides (12 members)
- Deep Dreams Locations (46 members)
- Deep Dreams Nexus Worlds (8 members)
- Delly (13 members)
- Delta judgment (17 members)
- Doctor (8 members)
- Documentation Templates (0 members)
- Documentation templates (1 member)
- Dohus (42 members)