The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AI Characters (24 members)
- AI Generated (31 members)
- AI Generated Images (2 members)
- AI Non-Player Characters (40 members)
- Abandoned (173 members)
- Abandoned Artifacts (1 member)
- Abandoned Elements (5 members)
- Abandoned Technology (5 members)
- Abhuman Characters (0 members)
- Abnormal Human Characters (11 members)
- Adara Sector (6 members)
- Advanced Armor (13 members)
- Advanced Technology (89 members)
- Advanced Weaponry (31 members)
- Advanced Weapons (1 member)
- All pages needing cleanup (1 member)
- Alternate Realities (2 members)
- American writer navigational boxes (1 member)
- Anarchist theory (1 member)
- Android Characters (3 members)
- Angelic Sins (45 members)
- Angelic Sins Characters (115 members)
- Angelic Sins Non-Player Characters (30 members)
- Angelic Sins Organizations (6 members)
- Animal navigational boxes (1 member)
- Anomalies (1 member)
- Anthropology (1 member)
- Armor (0 members)
- Article message templates (24 members)
- Article message templates with missing parameters (11 members)
- Articles containing Arabic-language text (1 member)
- Articles containing Japanese-language text (2 members)
- Astra Per Aspera Sector (1 member)
- Astralis Vertex Sector (1 member)
- Ataraddon Sector (7 members)
- Autonomy (2 members)
- Bars and Lounges (5 members)
- Beeria Sector (8 members)
- Bellatrix Antares Sector (6 members)
- Blazing Umbra (76 members)
- Blazing Umbra Characters (233 members)
- Blazing Umbra Non-Player Characters (80 members)
- Blazing Umbra Organizations (6 members)
- Book stub templates (1 member)
- CS1 errors: empty citation (2 members)
- CS1 errors: missing title (2 members)
- CatAutoTOC generates no TOC (1 member)
- CatAutoTOC on pages where PAGESINCATEGORY returns zero (1 member)
- Category namespace templates (1 member)
- Characters Not in the Game (4 members)