| Settings | |||||
|---|---|---|---|---|---|
| Name | Owner | Posts | Characters | ||
| Marauders | Sage/Nemesis | 0 | 3 | ||
| Maredal | sphinx | 0 | 1 | ||
| Maredel | WarmestLight | 1 | 1 | ||
| Mareth | Kappa | 3 | 16 | ||
| Marian's Earth | Swimmer963 | 1 | 0 | ||
| Marked | Sage/Nemesis | 0 | 2 | ||
| Marketplace | sphinx | 1 | 2 | ||
| Mars | Hellevi | 1 | 11 | ||
| Martyrs | Jarn | 0 | 0 | ||
| Marvel | westwind | 5 | 6 | ||
| Marvel-616 | Anya | 6 | 23 | ||
| Marvel Cinematic Universe | Kappa | 5 | 86 | ||
| Marvel Cinematic Universe...kinda. | root | 0 | 2 | ||
| Marvel Universe | loki-zen | 0 | 9 | ||
| Mary Sue CYOA | Blazing Darkness | 10 | 11 | ||
| Mary Sue Notebook | Adelene | 0 | 2 | ||
| Mask-Maker | Kappa | 0 | 1 | ||
| Masks | Guilty | 0 | 23 | ||
| Mass Effect | andaisq | 7 | 85 | ||
| Mass Effect: Andromeda | deleted user | 0 | 1 | ||
| Master of His Domain | Kappa | 6 | 5 | ||
| Materia | Alicorn | 3 | 11 | ||
| Matilda | Kappa | 0 | 0 | ||
| Maximum Ride | Guilty | 0 | 9 | ||
| MCU | Anya | 3 | 26 | ||