Editing Mii

|firstgame    = ''{{s|miiwiki|Mii Channel}}'' (2006)<br/>''{{s|miiwiki|Wii Sports}}'' (in-game, 2006)<br/>{{for3ds}} (as Mii Fighters, 2014)

|lastappearance=''{{s|mariowiki|WarioWare: Move It!}}'' (2023, cameo)

|interwiki    = miiwiki

|interwikiname= MiiWiki

Miis debuted along with the Wii in late 2006. They can be created using the Wii's Mii Channel application, and users are able to customize many aspects of their appearance and facial features, such as their height, hairstyle, and eye color to resemble friends, family, and celebrities, or - with creative enough use of the provided facial parts - animals, fictional characters, and inanimate objects. Once created, Miis act as avatars for players in a variety of titles, including both first party releases such as {{uv|Wii Sports}} and ''{{s|mariowiki|Mario Kart Wii}}'' and third party titles such as ''{{s|wikipedia|Sonic & Sega All-Stars Racing}}'' and ''{{s|wikipedia|Jeopardy!}}'', and as a way of keeping track of individual players' scores. Miis saved onto a console are also capable of appearing as NPCs in games, usually acting as bystanders or spectators. Players could also save Miis onto their Wii remote and transfer them to another player's Wii, or submit them online using the ''Check Mii Out Channel''. While initially exclusive to the Wii, Miis would also see use in a few Nintendo DS games (the most notable example being the Japan-exclusive {{uv|Tomodachi|Tomodachi Collection}}), and later in several games on the Nintendo 3DS and Wii U, with the latter two being made using the Mii Maker application preinstalled on the system. The 3DS Mii Maker would introduce the ability to save a Mii as a QR Code to share on any website and download using the camera. Miis would return on the Nintendo Switch, but were made less of a focal point within games themselves early in the system's lifespan, with ''Super Smash Bros. Ultimate'' being one of the first to include Miis within the gameplay. Color choices were greatly expanded on, and Miis were available from launch as options for profile icons with a variety of facial expressions and poses. Later games such as ''{{s|mariowiki|Mario Golf: Super Rush}}'' and ''{{s|miiwiki|Miitopia}}'' once again saw Miis as focal playable entities, with the Switch version of ''Miitopia'' introducing a highly robust Mii creation studio. Miis also returned as playable characters in ''{{s|miiwiki|Nintendo Switch Sports}}'', though they were no longer the default characters of the game, that role being taken by a new set of characters known as "Sportsmates", which have more outfits and hairstyles available than Miis, and provide the option to play as anthropomorphic animals, but also have streamlined facial features.

There exist multiple [[List of rumors|rumors]] on the inclusion of Miis in ''Brawl'', with most claiming that [[Masahiro Sakurai]] did not want Miis in the game, saying "They have an innocent charm to them that could be ruined if they were in a fighting game." No website or print source, however, is known to corroborate these claims. This quote was, however, used when explaining why [[Villager]] or another {{uv|Animal Crossing}} character wasn't added in ''Brawl''.

The height and width of the Miis used also determines their attributes in game. Smaller/skinnier Miis are faster (having better mobility and less ending lag on their attacks) in exchange for having less range, being slightly lighter and dealing slightly less damage, while bigger/wider Miis are slower (having worse mobility and more ending lag on their attacks) in exchange for having more range, being slightly heavier and dealing slightly more damage. Smaller Miis are considered to be the most effective overall, as their greater speed more than makes up for their largely minor shortcomings in comparison with larger Miis. Small Mii Brawler in particular was considered to be a very strong character as the character was small, had incredible mobility and they had a very strong combo game which along with their custom moveset, could easily allow them to KO opponents at very low percents from a grab combo. On the flipside, larger Miis are considered to be the least effective, as their slower speed and larger size are much more detrimental than the minor advantages they gain. After {{Trn|EVO 2015}} however, only the default sized Miis have generally been allowed in tournaments.

On the fourth and current [[tier list]], which does not take custom special moves or sizes into account, the Mii Fighters are unranked, though, on the previous tier list, Mii Gunner, Mii Brawler, and Mii Swordfighter ranked 54th, 56th, and 57th respectively. Mii Brawler possesses good mobility, attack power and speed, yet has a lackluster reach and poor recovery. Mii Gunner has generally quick attacks and high reach, especially with its forward smash and up aerial, yet has a terrible grab game due to a lack of damage and an inability to start combos, along with mediocre mobility and a lack of ranged KO options. Mii Swordfighter has a [[disjointed]] range, quick grab, and versatility in its various special moves, but suffers from a lag-filled moveset and difficulty in KOing. However, the biggest drawback the Mii Fighters had for most of the game's lifespan is the banning of custom moves in most tournaments (along with restricting Miis to only be their default size), which was in effect for most tournaments throughout the game's life. Due to this, they were often forced to use only their default movesets with their default size, rendering their viability poor. Some tournaments late in the game's life did allow Miis to use their custom moves (such as {{Trn|Super Smash Con}} events starting from 2018) but this was too little too late for the Miis (and they were still restricted to their default size). As a result, all three Mii Fighters have some of the worst tournament representation out of the game's entire roster.

[[File:FightingMiiTeamMember.png|thumb|{{SSB4|Iggy}} encounters a Mii Brawler member of the Fighting Mii Team.]]

Miis are used as the players' tokens in the board game-like mode, Smash Tour, simply being used to move around between spaces and collect pick-ups. They appear to wear the same outfits that they do in the Mii Maker as opposed to their standard Mii Fighter uniforms, though they will wear a shirt that is either red, blue, green or yellow depending on their port colour. The Miis that are automatically loaded as representatives for CPUs are chosen at random, and the chances of a Guest Mii being chosen depends on how many Miis have been created on the console in question.

***In addition, Ryotaro Okiayu voices the Assist Trophies [[Zero]] and [[Alucard]] in the Japanese version.