Tomodachi Collection (トモダチコレクション ) is a DS game where you can interact with Miis. Miis can be transferred from your Wii to the game. The same also works the other way.
The Mii creation screen in Tomodachi Collection.
Your town in Tomodachi Collection.
After creating your first Mii, the Mii will ask you to create another one, and then the settings will be up to you!