Ginzō Matsuo was a Japanese actor, voice actor and narrator who was born in Nakatsu, Oita, Japan as Kōichi Matsuo. He was part of Aoni Production at the time of his death, but he established Gin Production in 1997. He was most known for the roles of Hemu-Hemu and Ginnosuke Nohara. On August 25, 2001, he died from acute subarachnoid hemorrhage, aged 49. His final roles were Captain Smoker in One Piece, Biff in s-CRY-ed and Taizo Kotobuki in Super GALS!