The Mii Maker (referred to as Mii Channel on the Wii) is a pre-installed application on the Wii, Wii U, and 3DS, plus a key feature of Tomodachi Collection and Tomodachi Life. This Mii Maker feature allows the ability for Miis to be created, and even added into the game. On both games, the Mii Maker can be accessed through the Town Hall.
While the pre-installed Mii Maker only allows the player to determine the looks of the Mii, the name, their favorite color, and their birth date.
Tomodachi Collection and Tomodachi Life have extended features. The player can now give their Miis different voices and personalities, which are divided into four categories, with each category consisting of 4 personality types.