Mii

A Mii is a customizable avatar used on several Nintendo consoles and mobile apps. Miis were first introduced on the Wii in 2006, and returned on the Nintendo 3DS, Wii U, the Nintendo Switch, and various Nintendo smartphone apps. 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 Wii Sports, or in some games 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.

Miis appear in a few Sega games for Nintendo consoles. Their first appearance in Sega-produced media is Jissen Pachi-Slot Pachinko Hisshōhō! Hokuto no Ken Wii, a collection of pachinko games for the Wii. Aside from this, Miis also appear in some Sonic the Hedgehog games and some crossover series including Mario & Sonic and Super Smash Bros..

Mario & Sonic at the Olympic Games
In the Wii version of Mario & Sonic at the Olympic Games, Miis are playable characters, and all of their stats are ranked five out of ten. Miis have no voice acting unlike the other characters, and they are simply called "Mii" during events.

Mario & Sonic at the Olympic Winter Games
Miis return in Mario & Sonic at the Olympic Winter Games for the Wii. This time, Miis can be customized to wear different clothes and accessories. Unlike the previous game, their stats differ depending on the gear. They can even wear different costumes of the playable characters in the game. Some of the bosses from Festival Mode also give off their costumes for Miis to wear once defeated.

Mario & Sonic at the London 2012 Olympic Games
Miis return as playable characters in Mario & Sonic at the London 2012 Olympic Games for the Wii. As in the previous installment, players can customize their Miis with accessories and wear various costumes. These are earned when playing in the Olympic events and the London Party mode.

Mario & Sonic at the Sochi 2014 Olympic Winter Games
In Mario & Sonic at the Sochi 2014 Olympic Winter Games, just like in the three previous installments on the Wii, Miis stored on the game console are playable characters. As with the previous three installments, Miis are customizable; however, this time around Miis will actually show what type their clothing makes them.

Mario & Sonic at the Rio 2016 Olympic Games
Miis return as playable characters in both the Nintendo 3DS version and the Wii U version of Mario & Sonic at the Rio 2016 Olympic Games. This is the first Mario & Sonic game to feature the Miis as playable in both versions.

In the Nintendo 3DS version, Miis are still customizable as before, and they are one of three characters who are playable in any event, the other two being Mario and Sonic. Miis are the primary character in the Road to Rio mode. Other Miis who act as townsfolk and opponents also appear in Road to Rio, and they have text dialogue unlike the playable Miis.

Super Smash Bros. Brawl
In Super Smash Bros. Brawl, the player's Mii can be used in online matches to represent themselves. Miis also appear as audience members in some stages, like Mario Circuit and Pokémon Stadium 2.

Super Smash Bros. for Nintendo 3DS / Wii U
Miis (named Mii Fighters) are playable fighters in Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U. They represent the Super Smash Bros. series in their emblem, even though Miis do not originate from the Super Smash Bros. series. They are the only playable fighters who have this emblem and the only ones who are not fought in All-Star Mode.

When creating a Mii Fighter, the player can select it to have one of three different classes: Mii Brawlers, Mii Gunners, and Mii Swordfighters. Brawlers specialize in fighting melee style, while Swordfighters and Gunners utilize a sword and a gun in their movesets, respectively. Each class can select four out of twelve special moves, making up a total of 36 special moves. When playing online, Miis can only be used when playing in With Friends mode.

When customizing a Mii, the player is able to equip it with custom outfits and headgear, with more available to be purchased as DLC. In terms of equipment, all Miis can use the Jacket and Boots equipment; Mii Brawler can use the Gloves; Mii Swordfighter can use the Sword; Mii Gunner can use the Arm Cannon.

The Multi-Man team is also composed of Miis, called the Fighting Mii Team, which replace the Fighting Alloy Team from Super Smash Bros. Brawl. Miis are loaded from those saved on the console and given a random class of Mii Fighter. These Miis are dressed full black, and cannot use shields, special moves, and items. They also cannot grab ledges, but will use a Footstool Jump on other Miis to recover.

In Super Smash Bros. for Nintendo 3DS, regular Miis also appear in the Tomodachi Life stage, also randomly loaded from the system.

At E3 2014, where the Mii Fighters were first officially revealed, Masahiro Sakurai explained that Miis were considered to be included as playable characters in Super Smash Bros. Brawl, but they were ultimately not included as Sakurai felt that it did not seem right at the time for Miis to be punching and kicking. The Miis were also removed due to online bullying and Sakurai thought that the Miis had a lack of character to themselves and would not be interesting enough characters.

Super Smash Bros. Ultimate
Mii Fighters return in Super Smash Bros. Ultimate. Their proportions have been altered so that they have smaller heads, and their default clothing have been altered as well. Additionally, players can choose between 12 different voice options to set for their Mii Fighters, each of which can be played at three pitches: low, medium, and high. In total, Mii Fighters have 36 selectable voices, all voiced by different voice actors:

Additionally, the Mii Fighters are unique in the sense that they are the only characters to retain custom specials. Though Mii Fighters still have customizable outfits, their body proportions cannot be adjusted in-game; Mii Brawlers have set weights of 94 units, Mii Swordfighters have set weights of 100 units, and Mii Gunners have set weights of 104 units.
 * Type 1 is provided by, who also voiced Ken in the Japanese version.
 * Types 2 and 12 are provided by.
 * Type 3 is provided by, who also voiced Fox in the Japanese version.
 * Type 4 is provided by, who also voiced Zelda and Sheik.
 * Type 5 is provided by, who also voiced the Assist Trophies Zero from Mega Man X and Alucard from Castlevania III: Dracula's Curse.
 * Type 6 is provided by, who also voiced Kirby and Ness, as well as Lyn and Viridi in the Japanese version.
 * Type 7 is provided by Michihiko Hagi, who also voiced Ike in the Japanese version.
 * Type 8 is provided by, who also voiced Pit, Dark Pit, and the Assist Trophy Knuckle Joe in the Japanese version.
 * Type 9 is provided by, who also voiced Simon in the Japanese version.
 * Type 10 is provided by.
 * Type 11 is provided by, who also voiced Richter in the Japanese version.

Along with being able to create a custom Mii Fighter, the default ones representing each type can be unlocked after rescuing them in the World of Light. When a Mii Fighter type has been rescued, players will also gain access to using their own custom Mii Fighters in the World of Light.

Samba de Amigo (Wii)
In the Wii version of Samba de Amigo, Miis also make an appearance.

Sonic & Sega All-Stars Racing
Miis can race in the Wii version of Sonic & Sega All-Stars Racing. Miis drive the Super Zoomer and its All-Star Move is the Parade Power where four Miis pick up your car and start running, knocking out anybody in the way.

Sonic Colors
Miis are playable in the co-op feature of Sonic Colors. In the Game Land zone, they can use all of Sonic's/Virtual Hedgehog's powers and can use the Wisps powers. Their appearance is the same as the selected Mii, same head and arm shape but with Sonic's upper body and shoes. The voice when selected a color Wisp remains the same. Same as with Virtual Hedgehog, should one jump on the Mii's head, he/she will become dazed. A Mii can also be the icon on the player's saved file.

Sonic & All-Stars Racing Transformed
Miis return in the Wii U version and Nintendo 3DS version of Sonic & All-Stars Racing Transformed. They drive the Super Zoomer, which is modeled after the logo from the arcade game OutRun, except with the paint job of the Mii's favorite color.

In the Wii U version, Miis are an unlockable character, although the player can only play as their personal Mii. They can be unlocked by completing the first GP circuit on any difficulty, which also unlocks the mirror GP circuit.

In the Nintendo 3DS version, Miis are unlocked by clearing all Mirror GPs. The player can pick from any Mii on the console and from some Quest Miis. In Download Play, the Miis are used by the recipient players.

Sonic Unleashed
In the Wii version of Sonic Unleashed, the player can use a Mii as their save file icon.

Sonic Generations
Miis make a cameo appearance in the Nintendo 3DS version of Sonic Generations as a Profile Card. Miis can also be seen through StreetPass, and they are also featured as Wi-Fi icons.

Sonic Lost World
Miis cameo in the Nintendo 3DS version of Sonic Lost World, reprising their roles as icons for the player's Profile Card. These are seen during online multiplayer matches, and can even be traded via StreetPass.