Mitsuo Yamaguchi (山口 光雄, Yamaguchi Mitsuo; born May 23, 1965), known professionally as Kappei Yamaguchi (山口 勝平, Yamaguchi Kappei), is a Japanese actor, voice actor, and rakugoka currently affiliated with Gokū and formerly with 21st Century Fox. After making his voice acting debut in 1989 as the male version of the titular character Ranma Saotome in the Ranma ½ television anime, he went on to perform other notable roles such as the titular character in Inuyasha and in its sequel Yashahime, and L in Death Note. He currently voices Shinichi Kudo and Kaito Kid in Great Detective Conan, Usopp in One Piece and Teddie in Persona 4. He is married and has a son named Ryūnosuke and a daughter named Akane. Ryūnosuke and Akane are also voice actors, while the latter is also a rakugoka.
Source: “Kappei Yamaguchi”, English Wikipedia (CC BY-SA 4.0), excerpt