Mitsuo Yamaguchi (山口 光雄 Yamaguchi Mitsuo?), better known by his stage name of Kappei Yamaguchi (山口 勝平 Yamaguchi Kappei?), is a Japanese seiyū and actor from Fukuoka, affiliated with Gokū and Gekidan 21 Seiki Fox. He is married and has a son.
Kappei is best known for the roles of Ranma Saotome (Ranma ½), Jackson Neil (Miracle Girls), Tombo (Kiki's Delivery Service), Yattaro (Kyattou Ninden Teyandee), InuYasha (InuYasha), Ryuichi Sakuma (Gravitation), L (Death Note), Usopp (One Piece), Hideyoshi (Law of Ueki), and Kaito Kid and Shinichi Kudo (Case Closed). His recent roles include that of Raimon "Monta" Taro, the Deimon Devil Bats' ace receiver in Eyeshield 21, and Teddie from Persona 4.
- Kappei Yamaguchi at Wikipedia, the free encyclopedia.