A recurring original character from the Super Smash Bros. series, making her debut in Super Smash Bros. for Nintendo 3DS and Wii U. Between the Mii Brawler and Mii Swordfighter, her appearance is the most drastically altered between her debut game and Ultimate, and the only one to have a different color scheme in the sequel.
The original Mii Gunner had red-brown hair with symmetrically parted bangs and wore a long sleeved orange dress. Arguably her most iconic iteration, thanks in part to a plethora of memetic fanart and an, erm, "interesting" animated parody featuring the character.
The Mii Gunner from Ultimate has grayish brown hair and eyes. She swaps out the orange for yellow, and instead wears a cool cropped jacket with coordinating footwear to boot. She was initially completely forgettable amidst the largest Smash Bros. cast of all time, but after the announcement of a certain DLC costume, she has since been subjected to a relentless amount of memes. Mostly being about how she would be completely forgettable if it wasn't for her donning someone else's likeness.
For tagging purposes, this should be referring to the character herself. For other Miis that fight with an arm cannon or otherwise shoot laser beams, please just use Mii (Nintendo).
Known as Mii Fighter (Shageki Type) in Japan.