I'm not sure if I quite like that idea, to be perfectly honest. Or well, the OC centrality of it all. I may sound a bit blunt here, and I do not mean to be rude, but with the number of people wanting to play OCs, maybe it would be best for someone to run a separate game for a pseudo OC crossover for Magical Girls? 

Alas, I'd prefer to stick to the true nature of a crossover as much as possible in my own game. I'll still allow OCs, but I feel like there won't be enough slots for people who want to strictly play OCs so it would be better for those people to have their own game. I will not mind at all if someone wants to take the idea and run with it.