The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Location templates (7 members)
- Locations (3,364 members)
- Locations with Wake-Up Events (3 members)
- Luok (5 members)
- MadameMimic (8 members)
- Madotsuki images (95 members)
- Maengo (1 member)
- Maintenance (15 members)
- Makitsuki's Worlds (23 members)
- Manga images (80 members)
- Maple (37 members)
- Maps (52 members)
- Maptsuki (92 members)
- MedicineMan1920 (1 member)
- 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 (12 members)
- Milica (1 member)
- MillieAmp (20 members)
- Minichibis (2 members)
- Misc Images (213 members)
- Missing Author (1 member)
- Missing BGM (504 members)
- Missing BGM author (0 members)
- Missing Location (9 members)
- Missing Map ID (16 members)
- Missing Role (9 members)
- Missing Version Added (706 members)
- Missing infobox image (20 members)
- Missing speed (5 members)
- Mitzyrie (10 members)
- Mizkura (3 members)
- Moerani (1 member)
- Mokaccino (10 members)
- Mooncaller (1 member)
- Moriwo (66 members)
- Mosenite (49 members)
- Multi-page Locations (12 members)
- Muma Rope (4 members)
- Muma Rope Characters (1 member)
- Muma Rope First Steps Worlds (3 members)
- Muma Rope Guides (5 members)
- Muma Rope Locations (78 members)
- Muma Rope Screenshots (1 member)
- Murasaki no Yume (4 members)