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)
- Character sprites (3 members)
- Characters (3 members)
- Characters by era (2 members)
- Characters by species (3 members)
- Companies (1 member)
- Concept art (2 members)
- Cover art (1 member)
- Disambiguation (1 member)
- Documents (5 members)
- Documents by source (1 member)
- Documents by type (1 member)
- Enemies (1 member)
- Enemies by era (2 members)
- Fair use documents (7 members)
- Fair use images (12 members)
- File maintenance (4 members)
- File notices (3 members)
- File templates (3 members)
- Files needing a summary (3 members)
- Files needing categorization (0 members)
- Files to be replaced (0 members)
- Files with versions pending deletion (0 members)
- Formatting templates (14 members)
- Game concept art (1 member)
- Game covers (1 member)
- Game documents (1 member)
- Game engines (1 member)
- Game franchises (1 member)
- Game images (5 members)
- Game screenshots (4 members)
- Game series (1 member)
- Game sprites (3 members)
- Gameplay (2 members)
- Games (3 members)
- Help (4 members)
- Human (2 members)
- Human characters (2 members)
- Icons (3 members)
- Images (6 members)
- Images by Craig Mullins (1 member)
- Images by Reginald Djour (2 members)
- Images by Robert Mclees (3 members)
- Images by artist (1 member)
- Images by copyright status (1 member)
- Images by source (1 member)
- Images by subject (6 members)
- Images by type (12 members)
- Images of Pfhor characters (1 member)
- Images of characters (2 members)
- Images of human characters (1 member)
- Images of locations (1 member)
- Images of planets (2 members)
- Images of ships (2 members)
- Images of species (3 members)
- Images of technology (2 members)
- Images of vehicles (1 member)
- Images of weapons (6 members)
- Indexed pages (0 members)
- Infobox templates (9 members)
- Locations (2 members)
- Locations by era (2 members)
- Logos (3 members)
- Maintenance (8 members)
- Manual images (3 members)
- Marathon (1994) images (9 members)
- Marathon (1994) manual images (5 members)
- Marathon (1994) screenshots (2 members)
- Marathon (1994) sprites (5 members)
- Marathon (1994) terminal images (3 members)
- Marathon (202X) concept art (1 member)
- Marathon (202X) images (2 members)
- Marathon (202X) screenshots (0 members)
- Marathon (reboot) concept art (0 members)
- Marathon (reboot) images (0 members)
- Marathon (reboot) screenshots (0 members)
- Marathon 2: Durandal images (11 members)
- Marathon 2: Durandal manual images (4 members)
- Marathon 2: Durandal screenshots (2 members)
- Marathon 2: Durandal sprites (0 members)
- Marathon 2: Durandal terminal images (9 members)