The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 75 (1 member)
- Adults (20 members)
- Aliens (4 members)
- Alternate versions of Johnny Test seen in the League of Johnnys (0 members)
- Animals (20 members)
- Anti Hero (1 member)
- Article management templates (2 members)
- Article stubs (0 members)
- Australian people of British descent (1 member)
- Award Monitors (3 members)
- Blog posts (83 members)
- Book (70 members)
- Brother (2 members)
- Browse (20 members)
- Bullies of Johnny Test (1 member)
- CC-BY files (2 members)
- Canadian people of British descent (1 member)
- Candidates for deletion (9 members)
- Category templates (3 members)
- Characters (117 members)
- Characters/people similar to the Sissy (1 member)
- Characters From The Last Web Series (1 member)
- Characters whose genderswapped versions were seen in "Johnny Alternative" (10 members)
- Christmas (3 members)
- Community (3 members)
- Community news (1 member)
- Copyright (1 member)
- Country data templates (2 members)
- Country data templates with distinct template name (1 member)
- Crew (15 members)
- DVD (172 members)
- Deceased (5 members)
- Disambiguations (4 members)
- Dogs (2 members)
- Drinks (1 member)
- Enemy (5 members)
- Episode (1 member)
- Episodes (288 members)
- Episodes With New Inventions (199 members)
- Episodes With No Inventions (11 members)
- Episodes that Parody other media (40 members)
- Episodes where dukey loves bacon instead of steak (1 member)
- Episodes with only character names in the title (2 members)
- Episodes with the Name Johnny (8 members)
- Evolution (7 members)
- Example (1 member)
- Failed Inventions (8 members)
- Fanfiction (1 member)
- Female (22 members)