To settle the matter on the Male Fairy, it does not actually break canon at all. In fact, there is a school called Lynphea College which does indeed have male fairies. They are just not as common as the female fairies so they don't have their own private school. And as I stated before, unless there is a big uproar about OCs and Magical Boys or a combination of both, I will allow them. Keep in mind, that I don't want male OCs to outnumber the canon magical girls otherwise this won't be magical girl crossover anymore.
I'm thinking I might a put a limit on the number of OCs applicable. Maybe four or five? What do you think would be a good number? Note, that this limit does not apply to OC villains.
@Crimson Flame, while I won't say no, as previously stated I'm going to be really tentative about the number of ocs signed up.
@Tachi, I could set it up for nonlethal fighters to have things to do as well. Possibly two seperate threats? One for those uncomfortable with their character killing, so it would be more of the purifying sort and a different threat happening at the same time for the lethal fighters by destroying monsters, etc etc. Also, PC villains are allowed.
Finally, many thanks to the people who offered to help me GM, I really appreciate it and could use the help! If you have any ideas on how to do our melting pot setting, post them here or pm them to me.
I think I addressed everything. If I missed something, let me know.