
Highest rated as cast or director
One Piece
1999 · 23 Seasons
Death Note
2006 · 1 Season
Detective Conan
1996 · 1 Season
ODDTAXI
2021 · 1 Season
Descending Stories
2016 · 2 Seasons
One Outs
2008 · 1 Season
Biography
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.
Acted in 374
2020s
- 2026
A Lazy Day in Thousand Sunny
Usopp
- 2025
Detective Conan: The 17-Year-Old Truth
Shinichi Kudo (voice)
Stage Play 「Spooky Kitaro」
Movie
- 2024
One Piece Log: Fish-Man Island Saga
Usopp · 21 episodes
One Piece Fan Letter
Usopp
- 2023
The Incident
TV
- 2022
- 2021
One Piece - En route vers l'épisode 1000
Comédien de doublage de Usopp – Japon
航海王:和之国总集篇
配音 · 18 episodes
- 2020
2010s
- 2019
Super Sentai Strongest Battle Director's Cut
ToQger Arsenal (voice)
4 Week Continuous Special Super Sentai Strongest Battle!!
ToQger Arsenal (voice) · 4 episodes
- 2018
Planetarium HANAKAPPA: Bloom! Pop! Space Travel
Garizo (voice)
Peacemaker Kurogane: Belief
Shinpachi Nagakura (voice)
Engimon
Movie
- 2017
One Piece Episode of East Blue
Usopp (voice)
Makeruna!! Aku no Gundan!
Pepu (voice) · 12 episodes
Okaeri: Furusato no Karatsu
Sora Hiroi (voice)
Kamiwaza Wanda
Movie
- 2016
One Piece: The Great Treasure of Tongari Island
Usopp (voice)
One Piece Characters Log
Usopp · 9 episodes
- 2015
Ressha Sentai ToQger Final Live Tour 2015
Ticket / ToQger Equipment Voice (voice)
The Adventures of Tyrano Boy
Zesta (voice)
- 2014
Tomcat's Big Adventure
Michael (voice)
In Search of the Lost Future
Osafune Kenny Eitarou · 12 episodes
Ressha Sentai ToQger DVD Special: Farewell, Ticket! The Wasteland Super ToQ Battle!
Ticket (voice)
Gigant Big-Shot Tsukasa
Tsukasa Mendō (voice) · 32 episodes
Ressha Sentai ToQger vs. Kamen Rider Gaim: Spring Break Combined Special
Ticket / ToQger Equipment (voice)
- 2013
One Piece Episode of Merry: The Tale of One More Friend
Usopp (voice)
HANAKAPPA: Adventure in the Butterfly Kingdom
Garizo (voice)
That's HANAKAPPA Musical: Bread or Rice, Which Is It!?
Garizo (voice)
Dream 9 Toriko x One Piece x Dragon Ball Z Super Collaboration Special!!
Usopp (voice)
HANAKAPPA's Traffic Safety: Turn Right, Left, Right in Search of a Cake
Garizo (voice)
- 2012
VISUALIVE Persona 4
Kuma (voice)
Persona4 the ANIMATION -The Factor of Hope
Kuma (voice)
- 2011
Ghastly Prince Enma Burning Up
TV
Serena x One Piece: Sennyuu!! Sauzando Sunny-gou
Usopp (voice)
- 2010
Coicent
White Deer (voice)
Heart and Yummie
Heart (voice)
Tatsuya Miyanishi Theatre: Heart and Yummie
TV
2000s
- 2009
Space Battleship Yamato Resurrection
Ryohei Nakanishi (voice)
- 2008
Urusei Yatsura: The Obstacle Course Swim Meet, It's a Rumic World: Urusei Yatsura
(voice)
One Piece: Romance Dawn Story
Usopp (voice)
Ranma ½: Nightmare! Incense of Spring Sleep
Ranma Saotome ♂ (voice)
It's a Rumic World: 50th Anniversary Weekly★Shonen Sunday
Inuyasha / Ranma Saotome ♂ (voice)
- 2007
Mouse Story: The Adventures of George and Gerald
Chamberlain
Detective Conan: Black History
Movie
Pokémon Mystery Dungeon: Explorers of Time & Darkness
Chimchar (voice)
Detective Conan Magic File
Movie
- 2006
Futari wa Precure Splash☆Star: Maji Doki Theater
Flappy (voice)
Angel's Feather
Hamura Shou (voice) · 2 episodes
- 2005
ワンピース特別編 わかりやすいルフィ大百科
乌索普
One Piece Special: The Detective Memoirs of Chief Straw Hat Luffy
Usopp (voice)
Nagasaki 1945 ~ The Angelus Bells
Movie
Tomorrow Will Be Better! Half a Sweet Potato
Movie
Pretty Guardian Sailor Moon: Act Zero
Movie
- 2004
Pretty Guardian Sailor Moon Special Act: We're Getting Married!!
Movie
Netrun-mon the Movie
BB Runner
Sore Ike! Zukkoke Sannin-gumi
Hachibee · 26 episodes
- 2003
One Piece Special: Protect! The Last Great Stage
Usopp (voice)
Guitar wo Motta Shounen: Kikaider VS Inazuman
Saburo Kazeta/Inazuman
One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream!
Usopp (voice)
Mouse
Sorata Muon (voice) · 12 episodes
- 2002
Viper GTS
Ogawa (voice) · 3 episodes
Viper GTS
Ogawa · 3 episodes
One Piece: The Adventure in Grand Line
Usopp (voice)
Rizelmine
Tomonori Iwaki · 24 episodes
Gun Frontier
TV
La Blue Girl: Climax Taizen
Nin-Nin
A Tree of Palme
Roualt (voice)
- 2001
Sister Princess
TV
- 2000
Pichu & Pikachu's Winter Vacation 2001
Delibird (voice)
Psychic Detective Miko - Phantom Hunter
Rokuro Kanda (voice) · 2 episodes
Baby Felix & Friends
Poindexter
1990s
- 1999
My Dread is School! Kanako Inuki Shout Collection
Bukita
Gosho Aoyama’s Collection of Short Stories
Movie
- 1998
Twinbee PARADISE
Movie
Dragon Knight: Wheel of Time
Kakeru
Dragon Knight: Wheel of Time
Kakeru (voice) · 4 episodes
Dragon Knight 4: Wheel of Time
Kakeru · 4 episodes
Welcome to Lodoss Island!
Etoh (voice)
- 1997
Noiseman Sound Insect
Manabu (voice)
Eternal Family
Sasuke (voice)
Jungle de Ikou!
Takuma (voice) · 3 episodes
Kishin Douji Zenki Gaiden: Anki Kitan
Zenki
Ayane's High Kick
Kappei Inagaki (voice) · 2 episodes
- 1996
Jewel BEM Hunter Lime
バース (voice) · 3 episodes
Ultraman Super Fighter Legend
Astra / Announcer Banjou (voice)
Shadow Skill: The Movie
Scrib Lowengren
Lady Blue
Nin-Nin (voice) · 4 episodes
Magical Circle Guru Guru
Movie
Dragon Quest - Emblem of Roto
Movie
Neighborhood Story The Movie
Tsutomu Yamaguchi (voice)
Fire Emblem
Julian (voice) · 2 episodes
Teppen
Hanabishi Satoshi · 2 episodes
Can Can Bunny Extra
Kenta (voice) · 6 episodes
- 1995
Shadow Skill: Epilogue
Scrib Lowengren (voice)
- 1994
Mighty Space Miners
Ushiwaka Nanbu (voice) · 2 episodes
Butt Attack Punisher Girl Gautaman R: The Final Battle Between Love & Tragedy!
Shibuya (voice)
The Mighty Gin Rei
Daisaku Kusama (voice)
Twin Angels
Onimaro (voice) · 10 episodes
Bondage Queen Kate
Dick (voice)
Bondage Queen Kate
Dick (voice) · 2 episodes
Butt Attack Punisher Girl Gautaman: The Birth of Gautaman
Shibuya (voice)
Galaxy Warring State Chronicle Rai
(voice) · 52 episodes
Plastic Little: The Adventures of Captain Tita
Nicole (voice)
Tokyo Babylon 2
Subaru Sumeragi
Barefoot Gin Rei
Daisaku Kusama (voice)
GinRei
TV
Crows
Movie
- 1993
The Cockpit
Soldier Utsunomiya (voice) · 1 episode
Battle Angel
Yugo (voice) · 2 episodes
Silent Mobius Gaiden: The End of the Edo Period
Movie
Armored Dragon Legend Villgust
Bostov (voice) · 2 episodes
- 1992
Chibi Maruko-chan: My Favorite Song
Kenichi Oono (voice)
Appleland Story
Virgil
Tokyo Babylon 1
Subaru Sumeragi
Tokyo Babylon
Subaru Sumeragi (voice) · 2 episodes
Dragon Slayer
TV
Super Zugan
TV
Hanappe Bazooka
Hanahei Yamada (voice)
Desperate Love 1989
Katsumi Shibuya (voice)
Zetsuai 1989
Katsumi Shibuya (voice) · 3 episodes
Giant Robo: The Day the Earth Stood Still
Daisaku Kusama
The Heroic Legend of Arslan II
Movie
La Blue Girl
Nin-Nin (voice) · 14 episodes
K.O. Beast
Movie
KO Century Beast Warriors
Wan Dababatta · 7 episodes
KO世紀ビースト三獣士
TV
Boyfriend
Ougi (voice)
Tottoi
Billia (voice)
- 1991
Inferious Interplanetary War Chronicle - Condition Green
Oscar Cloud (voice)
Here Is Greenwood
Tenma Koizumi (voice) · 6 episodes
The Heroic Legend of Arslan
Movie
The Heroic Legend of Arslan: Age of Heroes
Arslan (voice) · 6 episodes
Urotsukidōji II: Legend of the Demon Womb
Young Munchausen II (voice)
Legend of the Dragon Kings
Amaru Ryudou · 12 episodes
Trusty Ginjiro
Ginjiro Yamazaki (voice)
Madara
(voice)
Samurider: Nazo no Tenkousei
山口
Go Nagai World
TV
- 1990
Violence Jack: Hell's Wind
Saburo Tenma
Chibi Maruko-chan
Kenichi Oono (voice)
Devil Hunter Yohko
Movie
Nineteen 19
Hiroaki Kusano (voice)
1+2=Paradise
Yūsuke Yamamoto · 2 episodes
Ryokunohara Labyrinth - Sparkling Phantom
Kanata Tokino
1980s
- 1989
- 1986
The Legend of Lyon: Flare
Eon · 2 episodes
No release date
Inherit the Winds
Momoyama Kyūsai (voice) · 1 episode







