The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ordinaries (25 members)
- Organisation (6 members)
- Pages using Tabber parser tag (3 members)
- Pages using duplicate arguments in template calls (2 members)
- Pages with a poll (1 member)
- Pages with broken file links (93 members)
- Policy (4 members)
- Portal Cells (1 member)
- Portal Elements (2 members)
- Portal Navbars (1 member)
- Portals (6 members)
- Protected templates (10 members)
- Real World (5 members)
- Red Series (2 members)
- S1W (2 members)
- Season Finale (1 member)
- Season One (21 members)
- Season One Main Characters (5 members)
- Season One Minor Characters (6 members)
- Season One Recurring Characters (6 members)
- Season Premiere (2 members)
- Season Two (21 members)
- Season Two Main Characters (7 members)
- Season Two Minor Characters (12 members)
- Season Two Recurring Characters (11 members)
- Seasons (2 members)
- Semi-protected templates (1 member)
- Series Bars (1 member)
- Site administration (4 members)
- Species (6 members)
- Template (1 member)
- Template (Navigation) (2 members)
- Template Templates (1 member)
- Template documentation (3 members)
- Templates (15 members)
- Tnavbar templates using fontcolor parameter (1 member)
- Tnavbar templates using miniv parameter (1 member)
- Tnavbar templates using viewplain parameter (1 member)
- Transgenics (43 members)
- Transhuman (6 members)
- Typing-aid templates (1 member)
- Unseen Characters (3 members)
- Utility templates (3 members)
- Videos (5 members)
- Weapons (1 member)
- Category:X5s (0 members)
- X5s (32 members)
- X6 (1 member)
- X6s (6 members)
- X8's (1 member)