The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Bokun (51 members)
- Braingirl (4 members)
- Braingirl:Guides (0 members)
- Braingirl:In Development (0 members)
- Braingirl:Locations (0 members)
- Braingirl Characters (1 member)
- Braingirl Guides (8 members)
- Braingirl In Development (6 members)
- Braingirl Locations (18 members)
- Braingirl Streets Hub Worlds (5 members)
- Braingirl Wiki:Guides (0 members)
- Braingirl Wiki:Images (0 members)
- Braingirl Wiki:In Development (0 members)
- Braingirl Wiki:Locations (0 members)
- Braingirl Wiki:Screenshots (0 members)
- Braingirl Wiki:Stubs (0 members)
- Braingirl Wiki:Unattributed files (0 members)
- Braingirl Wiki:Wiki skin images (0 members)
- Bralsra (2 members)
- Ca (5 members)
- Calicora (4 members)
- Camellia (7 members)
- Candidates for deletion (287 members)
- 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 (1 member)
- Colby (6 members)
- Collectables (0 members)
- Collective Unconscious (7 members)
- Collective Unconscious Annotated Maps (2 members)
- Collective Unconscious Authors (61 members)
- Collective Unconscious BGM (59 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)