Mii's don't really belong in the universes of other games. They look silly, cartoonish, and people would rather make other fictional characters out of them rather than themselves. They should really be their own universe rather than others. The best part about them though, is their potential and customization features. I wouldn't want them to be in any other way because you cannot balance a customizable Mii that well with so many different variables to pay attention to. Being in Friends Only matches is how they should be (shaming you Retro Studios for doing otherwise in MK7). 3 classes x 12 specials = 36 separate characters (not counting the size of the Mii).