Miis are customizable characters made to look like humans. Miis are created on the Wii in the Mii Channel, as well as the 3DS and Wii U. There can be up to 100 Miis on one Wii Console.
Miis appear in some Wii games as either part of the background or playable characters. They are the stars of Wii games such as Wii Sports, Wii Play, and Wii Fit.
In the V, you are allowed to create 1000 miis before you need to make miis on a another planet. Miis also can have a custom image, and changing pants has been easier. In other games, the Mii is known as an all-around in everything.