I have a 2 ideas so far.
1. Continuation of the Gears Of Terror RP series. (only people who are really really really old on this wiki should know what it is)
2. FNAF: Boss Rush! (basically you can play as the 5 main fnaf1 characters against multiple bosses in an rpg like way)
Do you have anymore ideas? You can leave some ideas in the comments if ya want.