Considering the Wii U itself and other software is based around Miis I find it odd that Smash is the one to funny funny about people's Mii creations.I see it as a PR nightmare waiting to happen. Some little kid cries to mom that some guy named hitler beat him up online. Mom doesn't understand, flips out, contacts the local news, etc.
Granted, a kid playing call of duty is subject to something much worse happening, but nintendo likes to maintain its family friendly image (and this isn't an M rated game) so the bad publicity could be much worse.
Buy another 3DS to display the rest of the roster.That would NEVER fit on the 3ds screen