The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 2x4 Technology (245 members)
- 2x4 Technology Officers (22 members)
- 2x4 Technology images (270 members)
- Admins (4 members)
- Adults (158 members)
- African-American Characters (20 members)
- African-American Characters of French Descent (1 member)
- Allies (123 members)
- Ally Headquarters (16 members)
- Ally Technology (6 members)
- Alternate world (2 members)
- Alternate world operatives (7 members)
- American Characters (38 members)
- Amusement parks (5 members)
- Animals (4 members)
- Antagonists (2 members)
- Anti-Heroes (6 members)
- Anti-Villains (12 members)
- Articles (1 member)
- Australian Characters (7 members)
- Awards (4 members)
- Babies (3 members)
- Background characters (9 members)
- Beetles Family (6 members)
- Blog posts (154 members)
- Books (7 members)
- Books (real) (6 members)
- Boys Next Door members (1 member)
- British Characters (18 members)
- C.A.K.E.D. Saga (7 members)
- CC BY-SA 4.0 images (9 members)
- Canadian Characters (1 member)
- Cancelled projects (6 members)
- Candidates for Integration (1 member)
- Candidates for deletion (18 members)
- Candy (22 members)
- Cast (51 members)
- Character models (120 members)
- Characters (262 members)
- Characters voiced by Ben Diskin (11 members)
- Characters voiced by Candi Milo (8 members)
- Characters voiced by Carlos Alazraqui (3 members)
- Characters voiced by Charlie Schlatter (2 members)
- Characters voiced by Cree Summer (14 members)
- Characters voiced by Daran Norris (18 members)
- Characters voiced by Dave Wittenberg (14 members)
- Characters voiced by Dee Bradley Baker (52 members)
- Characters voiced by Frank Welker (7 members)
- Characters voiced by Greg Cipes (2 members)
- Characters voiced by Greg Eagles (2 members)