The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Yume Nikki Events (13 members)
- Yume Nikki FC Locations (6 members)
- Yume Nikki Game Files (1 member)
- Yume Nikki Guides (12 members)
- Yume Nikki Images (15 members)
- Yume Nikki Locations (64 members)
- Yume Nikki Locations with Wake-Up Events (3 members)
- Yume Nikki Maps (106 members)
- Yume Nikki Minigames (2 members)
- Yume Nikki Nexus Worlds (12 members)
- Yume Nikki Other Images (0 members)
- Yume Nikki Other Media (8 members)
- Yume Nikki Panoramas (4 members)
- Yume Nikki Picture Files (2 members)
- Yume Nikki Protagonist Images (3 members)
- Yume Nikki Scrapped Characters (2 members)
- Yume Nikki Screenshots (28 members)
- Yume Nikki Sounds (4 members)
- Yume Nikki Unused Content (6 members)
- Yume Nikki Wiki:Decorative NPCs (0 members)
- Yume Nikki Wiki:Effect NPCs (0 members)
- Yume Nikki Wiki:Original Locations (0 members)
- Yume Nikki Wiki:Scrapped Characters (0 members)
- Yume Nikki Wiki:Unused (0 members)
- Yume Tagai (4 members)
- Yume Tagai Annotated Maps (0 members)
- Yume Tagai Guides (2 members)
- Yume Tagai Images (2 members)
- Yume Tagai Locations (35 members)
- Yume Tagai Maps (1 member)
- Yume Tagai Screenshots (0 members)
- Yume Tsushin (6 members)
- Yume Tsushin Annotated Maps (40 members)
- Yume Tsushin Characters (2 members)
- Yume Tsushin Guides (8 members)
- Yume Tsushin Images (2 members)
- Yume Tsushin Locations (64 members)
- Yume Tsushin Maps (41 members)
- Yume Tsushin Nexus Worlds (12 members)
- Yume Tsushin Screenshots (52 members)
- Yume Wiki Style Guide (10 members)
- Yume Wiki community (5 members)
- Yume wo Samayou (22 members)
- Yumebako (52 members)
- Z7 (3 members)
- ZLD1 (3 members)
- Zekonas (1 member)
- Zenmaigahara (35 members)
- Zetsu (4 members)
- Zoo (2 members)