The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Kontentsu (270 members)
- Kubotsuki's Nexus Worlds (0 members)
- Kubotsuki's Worlds (78 members)
- Kubotsuki BGM (1 member)
- 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)
- Location templates (7 members)
- Locations (3,363 members)
- Locations with Wake-Up Events (3 members)
- Luok (5 members)
- MadameMimic (2 members)
- Madotsuki images (95 members)
- Maengo (1 member)
- Maintenance (15 members)
- Makitsuki's Worlds (23 members)
- Manga images (80 members)
- Maple (34 members)
- Maps (52 members)
- Maptsuki (92 members)
- Meena (1 member)
- Messier (5 members)
- Mikan Muzou (3 members)
- Mikan Muzou Characters (1 member)
- Mikan Muzou Guides (4 members)
- Mikan Muzou Locations (55 members)
- Mikan Muzou Nexus Worlds (6 members)
- Mike (5 members)
- Milica (1 member)
- MillieAmp (7 members)
- Minichibis (2 members)
- Misc Images (213 members)
- Missing Author (1 member)
- Missing BGM (499 members)
- Missing BGM author (0 members)
- Missing Location (9 members)
- Missing Map ID (16 members)
- Missing Role (9 members)
- Missing Version Added (686 members)
- Missing infobox image (19 members)
- Missing speed (5 members)
- Mitzyrie (10 members)
- Mizkura (3 members)
- Moerani (1 member)
- Mokaccino (9 members)