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 (3 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)
• Candidates for merging‏‎ (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 (13 members)
• File maintenance‏‎ (4 members)
• File notices‏‎ (3 members)
• File templates‏‎ (3 members)
• Files needing a summary‏‎ (4 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 (2 members)
• Game covers‏‎ (2 members)
• Game documents‏‎ (1 member)
• Game engines‏‎ (1 member)
• Game franchises‏‎ (1 member)
• Game images‏‎ (5 members)