also i know it's lame but a mii would be pretty fun
What makes you think a Mii would be lame? They thought up moves and fighting styles for the Wii Fit trainer and the Villager that makes them seem like powerful characters worth using
They could even make the Mii take on the look of the Mii you use! (but stretch it's proportions to fit the skeleton/hitbox)
It actually sounds like a neat and silly idea