User blog comment:RainbowBowserJunior/Mii for Smash Bros?/@comment-11402229-20140609003213/@comment-5196731-20140609062037

Sonic appearing in Melee was just a fake rumor, but he was added in Brawl, and in SSB4. The Mii, on the other hand, will never be added as playable, just like in Brawl.