The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Atom Kirihara (1 member)
- Blog posts (0 members)
- Browse (7 members)
- Candidates for deletion (1 member)
- Cast (1 member)
- Characters (7 members)
- Companies (1 member)
- Disambiguations (0 members)
- Episodes (0 members)
- Games (1 member)
- Help (0 members)
- Idols (8 members)
- Images (2 members)
- L Nomura (1 member)
- Lagrange Point (12 members)
- Marginal No.4 (25 members)
- Music (1 member)
- Pages with broken file links (1 member)
- R Nomura (1 member)
- Rui Aiba (1 member)
- Seasons (1 member)
- Singles (13 members)
- Songs (16 members)
- Template documentation (9 members)
- Templates (7 members)
- Unicorn Jr. (9 members)
- Videos (8 members)