The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Abilities (5 members)
- Administration of this site (0 members)
- Adults (5 members)
- Article stubs (17 members)
- Articles with Wikipedia sections (2 members)
- Audio Clips (1 member)
- Blog posts (10 members)
- Bosses (20 members)
- Bosses (Christmas NiGHTS) (3 members)
- Bosses (Christmas NiGHTS into Dreams) (0 members)
- Bosses (Journey of Dreams) (8 members)
- Bosses (NiGHTS into Dreams) (8 members)
- Browse (15 members)
- CC-BY-SA files (0 members)
- CC-BY files (0 members)
- CC-SA files (0 members)
- Cameo Characters (7 members)
- Candidates for deletion (10 members)
- Characters (82 members)
- Characters (Christmas NiGHTS) (14 members)
- Characters (Christmas NiGHTS into Dreams) (0 members)
- Characters (Journey of Dreams) (17 members)
- Characters (NiGHTS into Dreams) (18 members)
- Children (2 members)
- Christmas NiGHTS Characters (1 member)
- Christmas NiGHTS Mini Games (4 members)
- Christmas NiGHTS enemies (0 members)
- Collectables (Christmas NiGHTS) (7 members)
- Collectables (Journey of Dreams) (10 members)
- Collectables (NiGHTS into Dreams) (8 members)
- Comic Characters (9 members)
- Comics (3 members)
- Community (3 members)
- Companies (6 members)
- Conditional copyrighted free use files (0 members)
- Copyright (3 members)
- Copyright tags (11 members)
- Copyrighted free use files (1 member)
- Crossover Characters (0 members)
- Crossover Content (17 members)
- Crossover Games (7 members)
- Development Team (17 members)
- Dreams (24 members)
- Dreams (Journey of Dreams) (9 members)
- Dreams (NiGHTS into Dreams) (9 members)
- Enemies (Christmas NiGHTS) (4 members)
- Enemies (Journey of Dreams) (12 members)
- Enemies (NiGHTS into Dreams) (11 members)
- English-language voice actors (8 members)
- English voice actors (0 members)