Favorite Miis (not to be confused with Famous Miis) are special Miis who the Mii Creator grants red pants. Only the favorite Miis of a Mii Creator get to have red pants. When they get to be Famous Miis, they get to have a crown next to their name in the "List of Miis in Mii Plaza". Other than this though, Favorite Miis aren't different from regular Miis.