The Gun Gale Online avatar of Kirito, from the Sword Art Online series, that appears in volumes 5 and 6 of the light novels. Kirito allowed the game to give him a randomly generated appearance, and ended up with an extremely rare "M9000" male avatar that shares most of the same appearances as the rare "F1300" female avatar.
The Pixiv tag is 男の娘キリト (Otoko no ko Kirito).