An image from One Piece Film: Strong World, one of the productions that also features Kappei Yamaguchi.

Kappei Yamaguchi

May 23, 1965 — Fukuoka, Fukuoka Prefecture, Japan

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 voice actor and actor from Fukuoka, affiliated with Gokū and 21st Century Fox. He 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 current starring roles include that of Raimon "Monta" Taro, the Deimon Devil Bats' ace receiver in Eyeshield 21.

Yamaguchi has appeared in eroge as Kyōya Ushihisa (牛久京也, Ushihisa Kyōya). He made his first public appearance in North America at Otakon 2008; and was also a guest at Sakura-Con 2009. Yamaguchi's third appearance to date has been at Animazement in 2010.

He is married and has a daughter, Akane Yamaguchi (山口茜), and a son, Ryunosuke Yamaguchi (山口竜之介), who also are voice actors.

Description above from the Wikipedia article Kappei Yamaguchi, licensed under CC-BY-SA, full list of contributors on Wikipedia.