Mitsuo Yamaguchi (山口 光雄, Yamaguchi Mitsuo, born May 23, 1965), better known by his stage name Kappei Yamaguchi (山口 勝平, Yamaguchi Kappei), is a Japanese actor, voice actor, and rakugoka affiliated with Gokū and 21st Century Fox. After making his voice acting debut in 1989 as the male version of Ranma Saotome in Ranma ½, Yamaguchi went on to other notable roles, including Inuyasha in Inuyasha and its sequel Yashahime, and L in Death Note. He currently voices Shinichi Kudo and Kaito Kid in Case Closed, Usopp in One Piece and Teddie in Persona 4. He is married and has a son, Ryunosuke, and a daughter, Akane. Ryunosuke and Akane are also voice actors, while the latter is also a rakugoka.

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