The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 2012 TV Series Images (96 members)
- 2014 Action Figures (52 members)
- 2015 Action Figures (1 member)
- Action Figures (145 members)
- Addictive Foods (2 members)
- Adults (27 members)
- Aerodynamic Vehicles (11 members)
- Alien Technology (28 members)
- Alien Weaponry (34 members)
- Aliens (75 members)
- Alive (48 members)
- Allies (60 members)
- Almost Deceased (0 members)
- Alopex's weapons (2 members)
- Amphibians (12 members)
- Animals (30 members)
- Anphibians (0 members)
- Anti-Hero (1 member)
- April's Weapons (11 members)
- April O'Neil action figures (3 members)
- April Themed Episode (7 members)
- Apriltello (1 member)
- Article management templates (4 members)
- Article stubs (18 members)
- Articles of Ninja Uniform (23 members)
- Assassins (14 members)
- Bad Girls (9 members)
- Bad Guys (111 members)
- Bad Mutants (32 members)
- Battle Cries (3 members)
- Baxters Inventions (14 members)
- Behind-The-Scenes (78 members)
- Birds (5 members)
- BlogListingPage (0 members)
- Blog posts (226 members)
- Books (17 members)
- Browse (4 members)
- Buildings (9 members)
- CC-BY files (1 member)
- Candidates for deletion (13 members)
- Candidates for speedy deletion (0 members)
- Casey Jones Themed Episode (3 members)
- Casey Jones action figures (2 members)
- Catchphrases (6 members)
- Category templates (3 members)
- Cats (4 members)
- Character Galleries (97 members)
- Character Images (94 members)
- Characters (273 members)