A Mii (/miː/MEE) is a customizable avatar used on several Nintendo video game consoles and mobile apps. The name Mii is a portmanteau of "Wii" and "me", referring to them typically being avatars of the players. Miis were first introduced on the Wii console in 2006 and later appeared on the DS, 3DS, the Wii U, the Switch, and various apps for smart devices such as Miitomo. Miis can be created using different body, facial and clothing features, and can then be used as characters within games on the consoles, either as an avatar of a specific player (such as in the Wii series) or in some games (such as Tomodachi Life and Miitopia) portrayed as characters with their own personalities. Miis can be shared and transferred between consoles, either manually or automatically with other users over the internet and local wireless communications.
On the 3DS and Wii U, user accounts are associated with a Mii as their avatar and used as the basis of the systems' social networking features, most prominently the now-defunct Miiverse. On the Nintendo Switch, a Mii can still be used as an account avatar, but avatars depicting various Nintendo characters are also available. Miis are also used as profile pictures for Nintendo Accounts and can be used in Nintendo smart device games such as Super Mario Run, Mario Kart Tour and the now-defunct Miitomo.
Games such as Wii Sports, Wii Sports Resort, Wii Sports Club, Nintendo Switch Sports, Mario Kart Wii, Mario Kart 8, Go Vacation, Super Mario Maker 2, Super Smash Bros. Ultimate and New Super Mario Bros. U Deluxe use Miis as playable characters.