One thing to bear in mind with the issues of hugely branched branched franchises is that, honestly, how many different Wolverines or whoever are people going to want to play? While yes, there is potential for abuse of the system here, is it really going to happen in our specific game?

Not to say this isn't a valid issue, but I feel like specifically limiting multiples to certain number is sort of silly. If people want to play another copy of the same character and can prove sufficiently that he's different from the one(s) already in the game, I think s/he should be allowed, regardless of how many we have already.