Mitsuo Yamaguchi , better known by his stage name Kappei Yamaguchi , 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 L in Death Note. He currently voices Shinichi Kudo and Kaito Kid in Detective Conan, 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.

Ranma Saotome is a fictional character and the titular protagonist of the manga series Ranma ½, created by Rumiko Takahashi. Ranma is a Japanese teenage boy who has trained in martial arts since early childhood. As a result of falling into an enchanted spring during a training journey in China, he is cursed to transform into a girl when splashed with cold water, while hot water changes him back into a boy. Throughout the series, Ranma seeks out a way to rid himself of the curse, while his friends, enemies, rivals, and many fiancées constantly hinder and interfere.