Miis are fun, 3D caricature portraits of you, your friends and family that are simple and easy to design.
Once you create a Mii, you can watch it come to life in certain Wii games!
Plus, in addition to storing Miis on the Wii, up to ten can be stored in your Wii Remote and taken to a friend's house to play on another Wii console.
Some Mii Channel-enhancing products you might want to consider:
You and Mii Guide