The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AI characters (6 members)
- ARG content (7 members)
- Administration (5 members)
- Aleph One (2 members)
- Alternate weapons (2 members)
- Appearance templates (7 members)
- Articles needing an image (0 members)
- Articles needing categorization (0 members)
- Articles needing cleanup (3 members)
- Articles needing fact cleanup (0 members)
- Articles with broken file links (2 members)
- Articles with incomplete sections (2 members)
- Articles with too many About links (0 members)
- Artificial intelligence (1 member)
- Artwork (3 members)
- Astronomical objects (2 members)
- Astronomy (1 member)
- Audio files (0 members)
- Candidates for deletion (0 members)
- Character screenshots (0 members)