From Wikipedia, the free encyclopedia. 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), 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.

Kappei Yamaguchi plays as Usopp (voice) in One Piece.
Kappei Yamaguchi is the top #1 member of the cast and appears in 1050 episodes.

Mayumi Tanaka was born on January 15, 1955 in Tokyo, Japan. She is an actress, known for Dragon Ball Z (1989), Dragon Ball Z Kai (2009) and Dragon Ball Z (1996).

Mayumi Tanaka plays as Monkey D. Luffy (voice) in One Piece.
Mayumi Tanaka is the top #2 member of the cast and appears in 1050 episodes.

Okamura Akemi, born on March 12, 1969, is a voice actress (seiyuu) and narrator from Tokyo, Japan, who works for Mausu Promotion. Her blood type is O. She has had at least one song appear on the NHK program Minna no Uta. Okamura graduated from the Tokyo Announcement Academy (東京アナウンスアカデミー) in 1990 and afterwards joined the Mausu Promotion voice actor's training school until she was contracted officially as full fledged voice actress in 1992, when she was selected for the role of Fio Piccolo in the 1992 film Kurenai no Buta (Porco Rosso), her major debut.

Akemi Okamura plays as Nami (voice) in One Piece.
Akemi Okamura is the top #3 member of the cast and appears in 1050 episodes.

Hiroaki Hirata plays as Vinsmoke Sanji (voice) in One Piece.
Hiroaki Hirata is the top #4 member of the cast and appears in 1050 episodes.

Ikue Otani is a Japanese voice actress and singer, most famous for providing the voice of Pikachu in Pokémon. She took pregnancy leave from her work from January to May 2006, but her voice credit for Pikachu did not change, as her voice has been recorded many times.

Ikue Otani plays as Tony Tony Chopper (voice) in One Piece.
Ikue Otani is the top #5 member of the cast and appears in 973 episodes.

Yamaguchi Yuriko was born November 21, 1965 in Osaka Prefecture, Japan. She is a voice actress (seiyuu). Yuriko was initially part of 81 Produce, but went freelance, then joined Vi-Vo. Currently she affiliated with Aoni Production. Her real name is written a bit differently (山口百里子), but read the same way. Jinno Eiko and Nikaidou Yoshiko is aliases used by Yamaguchi Yuriko for adult games and anime.

Yuriko Yamaguchi plays as Nico Robin (voice) in One Piece.
Yuriko Yamaguchi is the top #6 member of the cast and appears in 959 episodes.

Kazuki Yao plays as Franky (voice) in One Piece.
Kazuki Yao is the top #7 member of the cast and appears in 822 episodes.

Cho plays as Brook (voice) in One Piece.
Cho is the top #8 member of the cast and appears in 714 episodes.

Mahito Ōba plays as Smoker (voice) in One Piece.
Mahito Ōba is the top #9 member of the cast and appears in 611 episodes.

Katsuhisa Houki (宝亀 克寿, Hōki Katsuhisa, October 30, 1946), born Katsuaki Houki (箒克朗, Hōki Katsuaki), is a Japanese actor and voice actor from Nagasaki Prefecture. He is affiliated with Aoni Production. Formerly, he was affiliated with the to theatrical company Toen, theatrical company Hyakukiza, Sigma Seven, Production Baobab, and Kenyu Office. He has been with Aoni Production since January 1, 2020.

Katsuhisa Houki plays as Jinbe (voice) in One Piece.
Katsuhisa Houki is the top #10 member of the cast and appears in 498 episodes.