The Mii universe refers to the Super Smash Bros. series' collection of properties that hail from the multitude of games that center around Miis, creatable avatars on every Nintendo console since the Wii. Wii Sports, Pilotwings, StreetPass Mii Plaza, Tomodachi and Miiverse are all considered sub-universes. Wii Fit could be considered another sub-universe but as it has its own non-Mii character, it is considered its own entity.
In Super Smash Bros. series
Main article: Mii
Miis are known as Mii Fighters when used as playable characters, but they use the Super Smash Bros. series symbol rather than the Mii symbol.
Other Mii-related content has been subdivided into its respective sub-universe in Smash, until the Mii symbol debuted in the spirit categories in Super Smash Bros. Ultimate in order to represent games that didn't fall under a particular Mii sub-universe, such as Nintendo Land and Wii Music.
Main article: List of spirits (Mii series)
List of sub-universes
Miitopia (ミートピア, Miitopia) is a role-playing game in which the player creates Miis of various classes in order to save the world's inhabitants' faces from the Dark Lord.
Nintendo Land (ニンテンドーランド, Nintendo Land) is a "virtual theme park" game released for the Wii U console at launch. Up to five players could play through 12 attractions based off of different Nintendo franchises, all of which incidentally appear in the Super Smash Bros. series to some degree as well.
The robotic park guide Monita appears as a trophy in Super Smash Bros. for Wii U and a Spirit in Super Smash Bros. Ultimate. A remix titled Nintendo Land Medley and a direct rip of Title Theme (Nintendo Land) play on the Miiverse stage and return in Ultimate for use on Summit, Duck Hunt, and stages from non-playable universes.
Main article: Pilotwings (universe)
Note: The Pilotwings series was not considered a Mii series until Pilotwings Resort started using Miis as the only characters.
StreetPass Mii Plaza
Main article: StreetPass Mii Plaza (universe)
Main article: Tomodachi (universe)
Wii Music (Wiiミュージック, Wii Music) is a music game released for the Wii and a part of the Wii series. The game involves creating arrangements of existing songs by controlling the members of an on-screen band. These songs can range from classical music to singles released by popular artists to songs from various Nintendo games.
Sebastian Tute, the host of the game, appears as a spirit in Super Smash Bros. Ultimate.
Wii Party (Wiiパーティ, Wii Party) is a party game series released as a part of the Wii series. The titles involve a combination of board game action with a variety of minigames - taking heavy inspiration from the Mario Party series, but featuring Miis as the playable characters.
A music track called Final Results (Wii Party U) plays on the Miiverse stage in Super Smash Bros. for Wii U, directly ripped from the game. It returns in Ultimate, now only playing on Summit, Duck Hunt, and stages from non-playable universes.
Party Phil, the host of the series, appears as a spirit in Super Smash Bros. Ultimate.
Wii Play (はじめてのWii, Your First Step to Wii) is a collection of minigames released for the Wii and a part of the Wii series. The game received a sequel called Wii Play: Motion, which required the Wii MotionPlus peripheral.
A music track called Charge! (Wii Play) plays on the PictoChat stage in Super Smash Bros. Brawl. It returns in Super Smash Bros. Ultimate, now only playing on Summit, Duck Hunt, and stages from non-playable universes.
Main article: Wii Sports (universe)