User blog comment:XLC-OR-66/The "Character Select Screen" Rumor/@comment-26454032-20140422034930/@comment-24835190-20140422170222

We cannot be sure about Pac-Man just because there's a Galaga ship and the S Flag, but still, that Mii in a cage of the Find Mii stage is considered as a background character rather than a playable character. So, I don't see how a Mii is going to be playable.