The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 3D Exclusive Items (1 member)
- Achievement images (76 members)
- Allies (17 members)
- Article management templates (8 members)
- Article stubs (20 members)
- Articles in need of revision (4 members)
- Articles with incomplete sections (7 members)
- Artwork (28 members)
- Balcony (8 members)
- Beta images (1 member)
- Blog posts (35 members)
- Blood Stained Sanctuary (10 members)
- Bosses (23 members)
- Browse (1 member)
- Bushlands (22 members)
- Candidates for deletion (1 member)
- Cave Story (3 members)
- Cave Story Wiki (2 members)
- Challenges (5 members)
- Character portraits (60 members)
- Characters (52 members)
- Citations needed (8 members)
- Community (4 members)
- Content (9 members)
- Credits images (17 members)
- Deceased (7 members)
- Developers (3 members)
- Disambiguations (1 member)
- Egg Corridor (15 members)
- Enemies (73 members)
- Females (9 members)
- Files (3 members)
- First Cave (7 members)
- Forums (6 members)
- Game modes (11 members)
- Games (7 members)
- General wiki templates (38 members)
- Help (0 members)
- Hidden categories (2 members)
- Humans (8 members)
- Image wiki templates (5 members)
- Images (20 members)
- Images needing improvement (13 members)
- In need of an image (2 members)
- Infobox templates (4 members)
- Item images (70 members)
- Items (34 members)
- JPEG (8 members)
- Labyrinth (26 members)