Bui (武威) is a demon warrior who possesses an immense battle aura. When he was younger Bui fought Younger Toguro and lost. He swore he would train and one day defeat him so Toguro invites Bui to join his team as he trains, but Bui is unable to surpass him. He wears heavy armor to suppress his aura and wields an axe larger than his own body. In the anime television series, Bui is voiced by Tetsuo Kaneo in Japanese and Vic Mignogna in English.