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.
Movies
Detective Conan: Captured in Her Eyes
Shinichi Kudo (voice)
Detective Conan: The Time Bombed Skyscraper
Shinichi Kudo (voice)
Case Closed: The Fourteenth Target
Shinichi Kudo (voice)
A Tree of Palme
Roualt (voice)
One Piece: Clockwork Island Adventure
Usopp (voice)
One Piece: The Desert Princess and the Pirates: Adventure in Alabasta
Usopp (voice)
Inuyasha the Movie 4: Fire on the Mystic Island
Inuyasha
Inuyasha the Movie 3: Swords of an Honorable Ruler
Inuyasha
Detective Conan: The Raven Chaser
Shinichi Kudo (voice)
Detective Conan: The Last Wizard of the Century
Shinichi Kudo / Kaito Kuroba (voice)
One Piece: Strong World
Usopp (voice)
A Wind Named Amnesia
Johnny
Dead Leaves
Retro (voice)
Plastic Little: The Adventures of Captain Tita
Nicole
Kiki's Delivery Service
Tombo (voice)
Escaflowne: The Movie
Shesta (voice)
Space Battleship Yamato Resurrection
Ryohei Nakanishi
Rurouni Kenshin: Requiem for the Ishin Patriots
Yasuharu Musashino
Grappler Baki: The Ultimate Fighter
Baki Hanma
One Piece: The Movie
Usopp (voice)
Eternal Family
Sasuke (voice)
Violence Jack: Hell's Wind
Saburo Tenma
One Piece 3D: Straw Hat Chase
Usopp (voice)
Heart and Yummie
Heart (voice)
Detective Conan: The Eleventh Striker
Shinichi Kudo (voice)
K.O. Beast
One Piece: Episode of Luffy - Hand Island Adventure
Usopp (voice)
Appleland Story
Virgil
Giant Robo: The Day the Earth Stood Still
Daisaku Kusama
Detective Conan: Private Eye in the Distant Sea
Shinichi Kudo (voice)
One Piece Episode of Merry: The Tale of One More Friend
Usopp
Hunter x Hunter: Phantom Rouge
Feitan (voice)
Ressha Sentai ToQger vs. Kamen Rider Gaim: Spring Break Combined Special
Ticket / ToQger Equipment (voice)
Detective Conan: Dimensional Sniper
Shinichi Kudo (voice)
Lupin the Third vs. Detective Conan: The Movie
Shinichi Kudo / Kaito Kuroba (voice)
Detective Conan: Sunflowers of Inferno
Shinichi Kudo / Kaitou Kid (voice)
Ressha Sentai ToQger The Movie: Galaxy Line S.O.S.
Ticket / ToQger Equipment / Narrator (voice)
Virgin Fleet
Sada
Magical Circle Guru Guru
Tottoi
Billia (voice)
Ressha Sentai ToQger Returns: Super ToQ #7 of Dreams
Ticket
One Piece: Adventure of Nebulandia
Usopp (voice)
Detective Conan: The Darkest Nightmare
Shinichi Kudo (voice)
The Boy and the Beast
Teenage Jiromaru (voice)
PERSONA4 the Animation -The Factor of Hope-
Kuma
GinRei Special OVA
Daisaku Kusama
One Piece Film: Z
Usopp (voice)
Battle Angel
Yūgo (voice)
Madara
(voice)
Inuyasha the Movie: Affections Touching Across Time
Inuyasha
Urotsukidōji II: Legend of the Demon Womb
Young Munchausen II (voice)
Yu-Gi-Oh!: Bonds Beyond Time
Daitokuji (voice)
One Piece Film: GOLD
Usopp (voice)
Case Closed: The Crimson Love Letter
Shinichi Kudo (voice)
Kishin Douji Zenki Gaiden: Anki Kitan
Zenki
Death Note Relight 1: Visions of a God
L (voice)
Desperate Love
Katsumi Shibuya (voice)
Episode of Sabo: The Three Brothers' Bond - The Miraculous Reunion
Usopp
One Piece: Jango's Dance Carnival
Usopp
One Piece: Dream Soccer King!
Usopp
Case Closed: Countdown to Heaven
Shinichi Kudo (voice)
Detective Conan: The Phantom of Baker Street
Shinichi Kudo (voice)
Death Note Relight 2: L's Successors
L (voice)
Detective Conan: Crossroad in the Ancient Capital
Shinichi Kudo (voice)
Bonobono: Secret of the Kumomo Tree
Araiguma-kun
One Piece: Chopper's Kingdom on the Island of Strange Animals
Usopp (voice)
Please Save My Earth
Hirohiko Kazama (voice)
Futari wa Precure Splash☆Star Tic-Tac Crisis Hanging by a Thin Thread!
Flappy
Kindaichi Case Files Movie 1: The Opera House Murders
Hajime Kindaichi (Voice)
One Piece: Baron Omatsuri and the Secret Island
Usopp (voice)
One Piece: Dead End Adventure
Usopp (voice)
Chibi Maruko-chan: My Favorite Song
Kenichi Oono (voice)
Boyfriend
Ougi (voice)
Barefoot Gin Rei
Daisaku Kusama (voice)
Pretty Guardian Sailor Moon Special Act: We're Getting Married!!
Pretty Guardian Sailor Moon: Act Zero
One Piece: Episode of Skypiea
Usopp (voice)
Case Closed: The Fist of Blue Sapphire
Shinichi Kudo / Kaito Kuroba (voice)
One Piece: Heart of Gold
Usopp (voice)
One Piece: Romance Dawn Story
Usopp (voice)
The Disappearance of Conan Edogawa: The Worst Two Days in History
Shinichi Kudo (voice)
One Piece Episode of Nami: Tears of a Navigator and the Bonds of Friends
Usopp (voice)
Detective Conan: Strategy Above the Depths
Shinichi Kudou (voice)
Case Closed: Zero the Enforcer
Shinichi Kudo / Kaito Kid (voice)
Urusei Yatsura: The Obstacle Course Swim Meet, It's a Rumic World: Urusei Yatsura
(voice)
Peacemaker Kurogane: Belief
Shinpachi Nagakura (voice)
Devil Hunter Yohko
Yona Yona Penguin
Mulmul (voice)
Chibi Maruko-chan
Kenichi Oono (voice)
Nineteen 19
Hiroaki Kusano (voice)
Shadow Skill: Epilogue
Scrib Lowengren (voice)
Mazinger Z: Infinity
Mucha (voice)
Detective Conan: Magician of the Silver Sky
Kaito Kid / Shinichi Kudou (voice)
One Piece: Stampede
Usopp (voice)
Atashin'chi: The 3D Movie
Fujino (voice)
One Piece: Curse of the Sacred Sword
Usopp (voice)
Zyuden Sentai Kyoryuger vs. Go-Busters: The Great Dinosaur War
ToQger equipment (voice)
Detective Conan: Episode One - The Great Detective Turned Small
Shinichi Kudo (voice)
It's a Rumic World: 50th Anniversary Weekly★Shonen Sunday
Inuyasha / Ranma Saotome (voice)
Pokémon: Pikachu's Rescue Adventure
Parasect (voice)
Camp Pikachu
Barubeat (voice)
Detective Conan: The Lost Ship in the Sky
Shinichi Kudo / Kaito Kid (voice)
Animal Crossing: The Movie
Fûta (voice)
Tomcat's Big Adventure
Michael (voice)
Ranma ½: The Movie — The Battle of Nekonron: The Fight to Break the Rules!
Ranma Saotome ♂ (voice)
Ranma ½: The Movie 2 — The Battle of Togenkyo: Rescue the Brides!
Ranma Saotome ♂ (voice)
Ranma ½: The Movie 3 — The Super Non-Discriminatory Showdown: Team Ranma vs. the Legendary Phoenix
Ranma Saotome ♂ (voice)
The Mighty Gin Rei
Daisaku Kusama (voice)
Inuyasha the Movie 2: The Castle Beyond the Looking Glass
Inuyasha
Detective Conan: The Scarlet Bullet
Shinichi Kudo (voice)
Tomorrow I'll be Lively ~Half Sweet Potato~
Nagasaki 1945 ~ The Angelus Bells
Delinquent in Drag
Suke Banji
Inferious Interplanetary War Chronicle - Condition Green
Oscar Cloud (voice)
Crows
Dragon Knight: Wheel of Time
Kakeru
Pichu & Pikachu's Winter Vacation 2001
Delibird (voice)
Bronze: Zetsuai Since 1989
Shibuya (voice)
Pretty Cure All Stars DX: Everyone Is a Friend - A Miracle All Pretty Cures Together
Flappy
Pretty Cure All Stars DX2: The Light of Hope - Protect the Rainbow Jewel!
Flappy (voice)
Pretty Cure All Stars DX3: Deliver the Future! The Rainbow-Colored Flower That Connects the World
Flappy
Pretty Cure All Stars New Stage: Friends of the Future
Flappy
Baby Felix & Friends
Poindexter
Hanappe Bazooka
Hanappe Yamada (voice)
Futari wa Precure Splash Star: Maji Doki Theater
Flappy (voice)
Mouse Story: The Adventures of George and Gerald
Chamberlain
Coicent
White Deer (voice)
Dream 9 Toriko & One Piece & Dragon Ball Z Super Collaboration Special!!
Usopp (voice)
Tiger & Bunny: The Beginning
Robin Baxter (voice)
Ranma ½ Nightmare! Incense of Spring Sleep
One Piece - En route vers l'épisode 1000
Comédien de doublage de Usopp – Japon
One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom
Usopp (voice)
One Piece: Giant Mecha Soldier of Karakuri Castle
Usopp (voice)
Noiseman Sound Insect
Manabu (voice)
Ressha Sentai ToQger DVD Special: Farewell, Ticket! The Wasteland Super ToQ Battle!
Ticket (voice)
Silent Mobius Gaiden -Bakumatsu Dark Woman Disposition-
One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends
Usopp (voice)
Detective Conan: Jolly Roger in the Deep Azure
Shin'ichi Kudo (voice)
Detective Conan: Full Score of Fear
Shinichi Kudo (voice)
Shadow Skill: The Movie
Scrib Lowengren
Detective Conan OVA 10: Kid in Trap Island
Kaito Kid / Kaito Kuroba
Pokémon Mystery Dungeon: Explorers of Time & Darkness
Chimchar (voice)
Ressha Sentai ToQger vs. Kyoryuger: The Movie
Ticket (voice)
The Adventures of Tyrano Boy
Zesta (voice)
The Adventures of Tyrano Boy
Bard (voice)
Shuriken Sentai Ninninger vs. ToQger the Movie: Ninjas in Wonderland
Ticket (voice), ToQger Equipment Voice
One Piece Film Red
Usopp (voice)
Asura
Okaeri: Furusato no Karatsu
Sora Hiroi (voice)
One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream!
Usopp (voice)
One Piece: The Desert Princess and the Pirates: Adventure in Alabasta
Lashes (voice)
Ryokunohara Labyrinth - Sparkling Phantom
Kanata Tokino
Detective Conan: The Bride of Halloween
Shinichi Kudo (voice)
Detective Conan: The Scarlet School Trip
Shinichi Kudo (voice)
Lupin the Third vs. Detective Conan
Shinichi Kudo (voice)
Detective Conan: The Private Eyes' Requiem
Shinichi Kudo (voice) / Kaito Kuroba (voice)
Detective Conan: Quarter of Silence
Shinichi Kudo (voice)
Luffy's Fall! The Unexplored Region - Grand Adventure in the Ocean's Navel
Usopp (voice)
Kamiwaza Wanda
One Piece: The Great Treasure of Tongari Island
Usopp (voice)
La Blue Girl: Climax Taizan
Nin-Nin
Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train
Kaito Kuroba (voice)
One Piece Special: Protect! The Last Great Stage
Usopp (voice)
One Piece Episode of East Blue
Usopp (voice)
Neighborhood Story The Movie
Tsutomu Yamaguchi (voice)
Ressha Sentai ToQger Final Live Tour 2015
Ticket (voice), ToQger Equipment Voice
One Piece Special: The Detective Memoirs of Chief Straw Hat Luffy
Usopp (voice)
Welcome to Lodoss Island!
Etoh (voice)
Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai
ToQger Equipment Voice
Gosho Aoyama’s Collection of Short Stories
One Piece: Episode of Alabasta - Prologue
Usopp (voice)
One Piece 3D: Gekisou! Trap Coaster
Usopp (voice)
One Piece: Glorious Island
Usopp (voice)
One Piece Film Gold: Episode 0
Usopp (voice)
Detective Conan: Black Iron Submarine
Shinichi Kudou (voice)
Case Closed: The Million-Dollar Pentagram
Kaito Kid / Shinichi Kudou (voice)
Detective Conan Magic File 2: Shinichi Kudo, The Case of the Mysterious Wall and the Black Lab
主演
Detective Conan vs. Kid the Phantom Thief
Kaito Kuroba / Kaito Kid (voice)
Engimon
1+2=Paradise
Yūsuke Yamamoto (voice)
Shows
Pretty Guardian Sailor Moon
Artemis (voice)
Flint: The Time Detective
Kyoichiro Narugami
Fancy Lala
Taro Yoshida
My Family
Fujino
Samurai Pizza Cats
Yattarou
Pecola
Bashatt
Stitch!
Kijimuna
Nadia: The Secret of Blue Water
Hamahama (voice)
Step Up Love Story
DearS
Case Closed
Jimmy Kudo
B'T X
Camilla (voice)
Kiba
Hugh
Miracle Girls
Yuuya Noda
Baccano!
Red Baron
Ken Kurenai
Baccano!
Chic Jefferson (voice)
Kamikaze Kaitou Jeanne
Noin Claude
Neo Angelique Abyss
Rune
InuYasha
InuYasha (voice)
Our Home's Fox Deity
Ayakashi: Samurai Horror Tales
Kaikaimaru (voice)
Shippuu! Iron Leaguer
Kiwami Juurouta
Wedding Peach
Takuro Amano
Papuwa
Dr. Gunma
Ranma ½
Ranma Saotome
Devil Hunter Yohko
Wakabayashi Osamu (voice)
Magi: Adventure of Sinbad
Valefor (voice)
Yu-Gi-Oh! GX
Professor Daitokuji / Lyman Banner (voice)
Powerpuff Girls Z
CLAMP School Detectives
Cyber Team in Akihabara
Crane Bahnsteik
Android Kikaider
Saburo Kazeda (voice)
Baby and Me
One Outs
Satoshi Ideguchi (voice)
Galaxy Warring State Chronicle Rai
Neighborhood Story
Tsutomu Yamaguchi (Voice)
Valkyria Chronicles
Gun Frontier
Eyeshield 21
Raimon Tarou
Red Baron
Fake Ken
Lil' Red Riding Hood Cha-Cha
Eden's Bowy
Jorrne
Zenki
Zenki
Rizelmine
Tomonori Iwaki
Angelic Layer
Doki Doki School Hours
Kenta Suetake
Betterman
Keita Aono
Pretty Cure Splash Star
Flappy
Sister Princess
Hanada Shounen-shi
Haruhiko
Majikoi - Oh! Samurai Girls
Ikuro Fukumoto (voice)
Papuwa
Chappy
Gravitation
Ryuichi Sakuma (voice)
Tokyo Babylon
Subaru Sumeragi (voice)
RG Veda
Ryū-ō (voice)
One Piece
Usopp (voice)
Rin-ne
Sabato Rokudou
The Little Judge from Hell
Enma (voice)
Giant Robo: The Day the Earth Stood Still
Daisaku Kusama
Revolutionary Girl Utena
Shiori's boyfriend (voice)
Battle Angel
Yugo (voice)
Makeruna!! Aku no Gundan!
Pepu (voice)
Mighty Space Miners
Ushiwaka Nanbu (voice)
Persona 4 The Golden Animation
Kuma
Space Pirate Captain Herlock: Outside Legend - The Endless Odyssey
Tochiro (voice)
Record of Lodoss War
Etoh (voice)
GeGeGe no Kitaro
Ittan Momen
Captain Tsubasa J
Ryou Ishizaki (voice)
JoJo's Bizarre Adventure
Shigechi (voice)
Super Dragon Ball Heroes
Fu (voice)
RADIANT
Master Lord Majesty
Magic Kaito 1412
Kaito Kuroba / Shinichi Kudo (voice)
Case Closed
Shinichi Kudo (voice)
Sgt. Frog
Tororo
1+2=Paradise
Yūsuke Yamamoto
Magic Kaito: Kid the Phantom Thief
Kuroba Kaito
Rampo Kitan: Game of Laplace
Shitai-kun
Angel's Feather
Hamura Shou
In Search of the Lost Future
Osafune Kenny Eitarou
BOFURI: I Don't Want to Get Hurt, so I'll Max Out My Defense.
Shin (voice)
Showa Genroku Rakugo Shinju
Amaken (voice)
Hikonin Sentai Akibaranger
Chief Clerk Blu-Ray (voice)
Hikonin Sentai Akibaranger
Chief Editor HVD (voice)
Free Kick Toward Tomorrow
Toto
Legend of the Dragon Kings
Amaru Ryudou
The Heroic Legend of Arslan: Age of Heroes
Arslan (voice)
Vinland Saga
Jabbathe (voice)
The Ancient Magus' Bride
Oberon (voice)
Slow Step
Akiba Shuu
Fire Emblem
Julian (voice)
Monkey Typhoon
Goku (voice)
Viper GTS
Ogawa
Please Save My Earth
Hirohiko Kazama (voice)
The Gymnastics Samurai
Bigbird Aragaki (voice)
Ranma ½
Ranma Saotome ♂ (voice)
Mouse
Sorata Muon (voice)
Yat, The Space Patrol
カナビー
ODDTAXI
Eiji Kakihana (voice)
Jewel BEM Hunter Lime
バース
Jujutsu Kaisen
Kechizu (voice)
The Ancient Magus' Bride: The Boy from the West and the Knight of the Blue Storm
Oberon (voice)
Ressha Sentai ToQger
Ticket (voice)
The Cockpit
Soldier Utsunomiya (voice)
La Blue Girl
Nin-Nin (voice)
Dragon Knight: Wheel of Time
Kakeru (voice)
Bondage Queen Kate
Dick (voice)
The Law of Ueki
Hideyoshi Soya (voice)
The Legend of Lyon: Flare
Eon
Can Can Bunny Extra
Kenta (voice)
Lady Blue
Nin-Nin (voice)
Persona4 the ANIMATION
Teddie (voice)
Yashahime: Princess Half-Demon
Inuyasha (voice)
KO Century Beast Warriors
Wan Dababatta
Jungle King Taa-chan
Etekichi
Mobile Fighter G Gundam
Sai Saici (voice)
Ghastly Prince Enma Burning Up
Here Is Greenwood
Tenma Koizumi (voice)
Ayane's High Kick
Kappei Inagaki (voice)
Space Academy
Jii-chan (voice)
Hakkenden: Legend of the Dog Warriors
Sosuke Inukawa (voice)
GinRei
The Twelve Kingdoms
Rokuta (voice)
Madara
Madara (voice)
Peacemaker
Shinpachi Nagakura (voice)
Zetsuai-1989
Katsumi Shibuya (voice)
Shadow Skill
Low (voice)
超爆裂異次元メンコバトル ギガントシューター つかさ
Super Zugan
Urusei Yatsura
B-Bo (voice)
Urusei Yatsura
Tsuyuo (voice)
Danganronpa: The Animation
Hifumi Yamada (voice)
Cowboy Bebop
Rhint (voice)
Armored Dragon Legend Villgust
Bostov (voice)
Reinou Tantei Miko: Phantom Hunter Miko
Rokuro Kanda (voice)
Tokusou Sentai Dekaranger
Thousanian Gineka (voice)
Tensou Sentai Goseiger
Ain-I of the Neutral (voice)
Doubutsu Sentai Zyuohger
Illusion (voice)
Death Note
L (voice)
Sore Ike! Zukkoke Sannin-gumi
Hachibee
Hunter x Hunter
Feitan (voice)
Genji Tsuushin Agedama
Hikari Yumenokōji
BUCCHIGIRI?!
Komao (voice)
One Piece Characters Log
Usopp
Urusei Yatsura
Saizo (voice)
Pop Team Epic
Popuko (voice)