The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Achievement images (19 members)
- Achievemnts (1 member)
- Augmentations (2 members)
- Candidates for deletion (1 member)
- Candidates for speedy deletion (0 members)
- Characters (1 member)
- Citation needed (0 members)
- Cleanup (0 members)
- Community (4 members)
- Copyright templates (10 members)
- Disambiguations (0 members)
- Disorders (2 members)
- Documentation templates (48 members)
- Drugs (5 members)
- Formatting templates (22 members)
- Hidden categories (1 member)
- Images (18 members)
- Images needing improvement (0 members)
- Infobox templates (1 member)
- Items (2 members)
- Legal notices (3 members)
- Locations (1 member)
- Lore (2 members)
- Main Page (4 members)
- Media (5 members)
- NPCs (2 members)
- Notice templates (13 members)
- Observer (15 members)
- Observer Wiki (12 members)
- Pages to be merged (0 members)
- Pages to be moved (0 members)
- Pages with broken file links (1 member)
- Protagonists (1 member)
- Screenshots (13 members)
- Stubs (1 member)
- Templates (15 members)
- Templates with bad documentation (0 members)
- Templates with no documentation (0 members)
- Unattributed files (0 members)
- Universe (7 members)
- User groups (12 members)
- Videos (0 members)
- Walkthrough (8 members)
- Wiki maintenance (14 members)
- Wiki skin images (10 members)