The Fighting Mii Team is a group of unplayable versions of the Mii Fighter. They replace the Fighting Alloy Team from Super Smash Bros. Brawl, and they of course appear in Multi-Man Smash. They also appear in Stage 5 of Classic Mode in the 3DS version, if the player chooses the path with the series' symbol, and are always fought in Round 6 of classic mode in the Wii U version.
The Fighting Mii Team retains the Brawler, Swordfighter, and Gunner varieties, but fail to use any special moves, similar to the past Fighting Team enemies. However, they can use all varieties of normal and Smash attacks, making them dangerous in a group. They cannot grab, but will sometimes use the player for a Footstool jump. They also seem to move slightly faster than the default varieties of normal Mii Fighters, and jump slightly higher.
They wear a black jumpsuit-style outfit with a large M on their front, with two lines running down the sides of their suits. Also, they will never spawn with a hat. They are based on Mii characters found on the players system, so nobody knows what they will look like. Also, when you fight against players on your friend list in group play, their personal Mii may appear as a Mii Fighter, as well as in the Tomodachi Life stage.
These weak fighters show up in droves in Multi-Man Smash. There are Brawler, Swordfighter, and Gunner types. Since they're based on the Mii characters saved on your Nintendo 3DS system or Wii U console, you could end up battling friends and family! Don't get soft--just take them out! Almost any attack does the trick.