Brian comes from Party Club, a fan-made Incredibox mod built around a dark, club-inspired cast of vocal characters, where he provides the male choir effect in normal mode. Like other Incredibox mods, it spread through fan videos, soundboards and remix edits, with players sharing individual character loops outside the game. The Dead Club community around the mod helped keep its characters circulating as separate sounds. Brian endures because his smooth, layered choir loop is instantly recognisable and easy to drop into edits, memes and atmospheric game clips.