The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- G-Seeker (8 members)
- GALAXY (26 members)
- GH8PoF17WqX (0 members)
- GIFs (89 members)
- Game Collectables (39 members)
- Guides (167 members)
- Gummy (18 members)
- Gummyema (5 members)
- HAL (21 members)
- Hashtag Underscore (5 members)
- Hatnote templates with errors (0 members)
- Hecatia (0 members)
- Help (10 members)
- Hidden categories (3 members)
- Hit2key (2 members)
- Horatsuki (84 members)
- Hub Worlds (110 members)
- Hubster (2 members)
- Hyo (0 members)
- INT (8 members)
- Image license templates (12 members)
- Images (854 members)
- Immuno (3 members)
- Imported vocabulary (7 members)
- In Development (763 members)
- Infobox templates (11 members)
- Infoboxes with missing header styling (98 members)
- JIVV (10 members)
- Jared (6 members)
- Jekyle (8 members)
- Jetrotal (1 member)
- John Ruiz (3 members)
- Jojogape (5 members)
- Juda (24 members)
- K0OdntepKs (2 members)
- KKO (1 member)
- Kaite20 (0 members)
- Kappa (54 members)
- Kong (7 members)
- Kontentsu (270 members)
- Kubotsuki's Nexus Worlds (0 members)
- Kubotsuki's Worlds (78 members)
- Kubotsuki Screenshots (1 member)
- Kuraud (95 members)
- Kurokagi (18 members)
- Kuroku (33 members)
- Lakes (1 member)
- Led (2 members)
- Lemniscate (25 members)
- Light (27 members)