Mii

For fighter info, see Mii Fighter

Miis are customizable characters that can be created by players on the Wii and Wii U. They can be made to resemble their creator, as well as other people. They first appeared on the Wii console as part of the Mii channel, and they could be shared by their creators on the Check Mii Out Channel.

The Miis did not merely stay on the console, however, as some of the Wii's first games such as Wii Sports used imported Miis as playable characters. Miis then made more appearances in casual games such as Wii Sports Resort and Nintendo Land, but have also transitioned to more prominent titles such as the Mario Kart series and New Super Mario Bros. U.

Character Description
Miis are humans, though they can be made to resemble other species, which players can create on the Wii, Wii U, and Nintendo 3DS. Most people make Miis of themselves, allowing them to play as themselves in games that use Miis. Since people come in wide varietys, Miis are incredibly diverse. The default Mii is a skinny, brunette Caucasian with straight hair and a red shirt, though many customizations are available which can alter everything like height, weight, hair, facial complexion, and much more. You can even add facial hair, caps, and sunglasses. On the Wii U and 3DS, an option exists to automatically make a Mii of you by taking your picture.

Since Miis are created by the players, they have little to no personality. The only time they usually make any expression is to celebrate after a victory and mope after a defeat.

In Super Smash Bros. for Wii U/3DS
Main article: Mii Fighter (SSBWU/3DS)

Miis were revealed to be new playable characters for Super Smash Bros. 3DS/Wii U on June 10, 2014 during Masahiro Sakurai's E3 Digital Presentation. They will come in three varieties: Mii Brawler, Mii Swordfighter, and Mii Gunner, each with their own attack style and selection of several possible Special Moves.