The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Articles needing context (1 member)
- Banned Users (1 member)
- BlogListingPage (0 members)
- Candidates for speedy deletion (1 member)
- Characters (3 members)
- Characters by gender (2 members)
- Characters by species (4 members)
- Cleanup (1 member)
- Companies (1 member)
- DOTT (5 members)
- Day of the Tentacle (1 member)
- Day of the Tentacle characters (4 members)
- Disambiguation (1 member)
- Edison inventions (2 members)
- Edisons (3 members)
- Extraterrestrials (1 member)
- Fair use images (4 members)
- Female characters (3 members)
- Free image copyright tags (2 members)
- GFDL images (3 members)
- Groups (1 member)
- Hidden categories (2 members)
- Humans (5 members)
- Image wiki templates (1 member)
- Items (1 member)
- Locations (1 member)
- Logos (1 member)
- Lucasarts (1 member)
- Male characters (7 members)
- Maniac Mansion (4 members)
- Maniac Mansion 2 (1 member)
- Maniac Mansion 2 characters (11 members)
- Maniac Mansion Wiki (1 member)
- Maniac Mansion characters (9 members)
- Maniac Mansion playable characters (6 members)
- Musicians (1 member)
- Non-free image copyright tags (4 members)
- Objects (2 members)
- Pages with broken file links (0 members)
- Plants (2 members)
- Public domain images (4 members)
- Scientists (1 member)
- Stubs (4 members)
- Tentacles (1 member)
- Video games (3 members)
- Videos (1 member)