Foo
Smash Lord
Mii fighters have customizable movesets, right? If so, they should be banned no matter what. It's unfair for you not to know what your opponent's moveset it is before a match. Also, even if the size thing isn't a balance issue, it's still a bannable offense. Every time you fought a mii fighter you'd have to get used to it's new speed, combo weight and hurtbox.