Mii

Miis are characters in the Nintendo Wii console; they take residence in the Mii Channel. Miis are human beings and players can design what their Miis look like. Players can make themselves into Miis or make any other person into Miis. Players can make as many Miis as they want.

Uses
The Miis can be used on many videogames for the Wii and can even be playable in the game Wii Sports. If the player hasn't created any Mii yet and is playing Wii Sports, the player will play as one of the game's default characters.

Appearances in Mario Games
Miis have also appeared with Wario in WarioWare: Smooth Moves and with Mario in Mario Party 8. In WarioWare: Smooth Moves, the Miis star in multiplayer mode and in a few of the microgames. One of the multiplayer modes starring the Miis is very similar to the minigame Balloon Bang.

Miis may be there own species, or they may just be regular humans.