The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Animals (6 members)
- Antagonists (1 member)
- Article management templates (4 members)
- Article stubs (107 members)
- Blight Family (5 members)
- BlogListingPage (0 members)
- Blog posts (10 members)
- Browse (7 members)
- Candidates for deletion (1 member)
- Candidates for speedy deletion (4 members)
- Captain Planet (2 members)
- Captain Planet and the Planeteers (1 member)
- Captain Planet and the Planeteers: Season One (DVD) (1 member)
- Category templates (4 members)
- Characters (53 members)
- Comic (4 members)
- Community (6 members)
- Content (11 members)
- Copyright (0 members)
- Copyright status unknown (18 members)
- DVD (2 members)
- Deceased characters (7 members)
- Deities (4 members)
- Descendants (1 member)
- Disambiguations (0 members)
- Dogs (4 members)
- Dr. Blight (Eco-villainess) (0 members)
- Eco-Villains (7 members)
- Episodes (105 members)
- Episodes featuring death (2 members)
- Episodes showing blood (3 members)
- Fair use (2,212 members)
- Families (1 member)
- Fan-Made (2 members)
- Females (15 members)
- Files (3 members)
- Former Villains (7 members)
- Forums (6 members)
- General wiki templates (34 members)
- Heat Wave/Gallery (1 member)
- Help (5 members)
- Help desk (2 members)
- Hidden categories (2 members)
- Humans (18 members)
- Image wiki templates (9 members)
- Images (5 members)
- Infobox templates (6 members)
- Items (5 members)
- Males (24 members)