Kappei Yamaguchi
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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.
Known for
Credits
Kiki's Delivery Service (1989)
as Tombo (voice)
Detective Conan: The Phantom of Baker Street (2002)
as Shinichi Kudo (voice)
One Piece Film Red (2022)
as Usopp (voice)
Detective Conan: One-Eyed Flashback (2025)
as Shinichi Kudo (voice)
Detective Conan: Black Iron Submarine (2023)
as Shinichi Kudou (voice)
Detective Conan: Quarter of Silence (2011)
as Shinichi Kudo (voice)
One Piece Film: GOLD (2016)
as Usopp (voice)
Death Note Relight 1: Visions of a God (2007)
as L (voice)
Detective Conan: Crossroad in the Ancient Capital (2003)
as Shinichi Kudo (voice)
Detective Conan: Captured in Her Eyes (2000)
as Shinichi Kudo (voice)
Detective Conan: Private Eye in the Distant Sea (2013)
as Shinichi Kudo (voice)
Detective Conan: The Last Wizard of the Century (1999)
as Shinichi Kudo / Kaito Kuroba (voice)
Lupin the Third vs. Detective Conan: The Movie (2013)
as Shinichi Kudo / Kaito Kuroba (voice)
Assassination Classroom the Movie: Our Time (2026)
as Futoshi (voice)
The Boy and the Beast (2015)
as Teenage Jiromaru (voice)
Detective Conan: The Private Eyes' Requiem (2006)
as Shinichi Kudo (voice) / Kaito Kuroba (voice)
One Piece: The Movie (2000)
as Usopp (voice)
One Piece Film: Z (2012)
as Usopp (voice)
One Piece: The Desert Princess and the Pirates: Adventure in Alabasta (2007)
as Usopp / Lashes (voice)
One Piece Film: Strong World (2009)
as Usopp (voice)
Detective Conan: The Darkest Nightmare (2016)
as Shinichi Kudo (voice)
Case Closed: The Fourteenth Target (1998)
as Shinichi Kudo (voice)
Detective Conan: Dimensional Sniper (2014)
as Shinichi Kudo (voice)
Detective Conan: The Scarlet Bullet (2021)
as Shinichi Kudo (voice)
Death Note Relight 2: L's Successors (2009)
as L (voice)
Case Closed: Countdown to Heaven (2001)
as Shinichi Kudo (voice)
One Piece: Baron Omatsuri and the Secret Island (2005)
as Usopp (voice)
One Piece: Giant Mecha Soldier of Karakuri Castle (2006)
as Usopp (voice)
One Piece: Episode of Skypiea (2018)
as Usopp (voice)
Detective Conan: Full Score of Fear (2008)
as Shinichi Kudo (voice)
Detective Conan: The Time Bombed Skyscraper (1997)
as Shinichi Kudo (voice)
Detective Conan: The Raven Chaser (2009)
as Shinichi Kudo (voice)
Mazinger Z: Infinity (2017)
as Mucha (voice)
Detective Conan: The Lost Ship in the Sky (2010)
as Shinichi Kudo / Kaito Kid (voice)
Dream 9 Toriko x One Piece x Dragon Ball Z Super Collaboration Special!! (2013)
as Usopp (voice)
One Piece 3D: Straw Hat Chase (2011)
as Usopp (voice)
Detective Conan: Jolly Roger in the Deep Azure (2007)
as Shin'ichi Kudo (voice)
Case Closed: The Crimson Love Letter (2017)
as Shinichi Kudo (voice)
One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends (2014)
as Usopp (voice)
Detective Conan: Magician of the Silver Sky (2004)
as Kaito Kid / Shinichi Kudou (voice)
Detective Conan: Strategy Above the Depths (2005)
as Shinichi Kudou (voice)
Ranma 1/2 the Movie 2: Nihao My Concubine (1992)
as Ranma Saotome ♂ (voice)
Detective Conan: Sunflowers of Inferno (2015)
as Shinichi Kudo / Kaitou Kid (voice)
Detective Conan: The Eleventh Striker (2012)
as Shinichi Kudo (voice)
Detective Conan: The Million-Dollar Pentagram (2024)
as Kaito Kid / Shinichi Kudou (voice)
Inuyasha the Movie: Affections Touching Across Time (2001)
as Inuyasha (voice)
Battle Angel (1993)
as Yūgo (voice)
One Piece: Clockwork Island Adventure (2001)
as Usopp (voice)
One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008)
as Usopp (voice)
Detective Conan: The Disappearance of Conan Edogawa - The Worst Two Days in History (2015)
as Shinichi Kudo (voice)
Ressha Sentai ToQger vs. Kyoryuger: The Movie (2015)
as Ticket (voice)
Yu-Gi-Oh! Bonds Beyond Time (2010)
as Daitokuji (voice)
One Piece: Curse of the Sacred Sword (2004)
as Usopp (voice)
Detective Conan: Episode One - The Great Detective Turned Small (2017)
as Shinichi Kudo (voice)
Ranma 1/2: Team Ranma vs. the Legendary Phoenix (1994)
as Ranma Saotome ♂ (voice)
One Piece: Chopper's Kingdom on the Island of Strange Animals (2002)
as Usopp (voice)
Zyuden Sentai Kyoryuger vs. Go-Busters: The Great Dinosaur War (2014)
as ToQger equipment (voice)
One Piece: Adventure of Nebulandia (2015)
as Usopp (voice)
Detective Conan: The Bride of Halloween (2022)
as Shinichi Kudo (voice)
One Piece: Dead End Adventure (2003)
as Usopp (voice)
Hunter x Hunter: Phantom Rouge (2013)
as Feitan (voice)
One Piece: Episode of Luffy - Hand Island Adventure (2012)
as Usopp (voice)
Inuyasha the Movie 4: Fire on the Mystic Island (2004)
as Inuyasha (voice)
Grappler Baki: The Ultimate Fighter (1994)
as Baki Hanma
One Piece: Heart of Gold (2016)
as Usopp (voice)
Pokémon: Pikachu's Rescue Adventure (1999)
as Parasect (voice)
Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train (2023)
as Kaito Kuroba (voice)
One Piece: Stampede (2019)
as Usopp (voice)
One Piece Episode of East Blue (2017)
as Usopp (voice)
Escaflowne: The Movie (2000)
as Shesta (voice)
Inuyasha the Movie 3: Swords of an Honorable Ruler (2003)
as Inuyasha (voice)
One Piece Film Gold: Episode 0 (2016)
as Usopp (voice)
One Piece: Dream Soccer King! (2002)
as Usopp (voice)
One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream! (2003)
as Usopp (voice)
Animal Crossing: The Movie (2006)
as Fûta (voice)
Urotsukidōji II: Legend of the Demon Womb (1991)
as Young Munchausen II (voice)
Lupin the Third vs. Detective Conan (2009)
as Shinichi Kudo (voice)
Gintama: Yoshiwara in Flames (2026)
as Inorin (voice)
One Piece Episode of Nami: Tears of a Navigator and the Bonds of Friends (2012)
as Usopp (voice)
Samurai X: The Motion Picture (1997)
as Yasuharu Musashino
Inuyasha the Movie 2: The Castle Beyond the Looking Glass (2002)
as Inuyasha (voice)
Detective Conan vs. Kid the Phantom Thief (2024)
as Kaito Kuroba / Kaito Kid (voice)
ワンピース特別編 わかりやすいルフィ大百科 (2005)
as 乌索普
One Piece: Jango's Dance Carnival (2001)
as Usopp (voice)
Plastic Little: The Adventures of Captain Tita (1994)
as Nicole (voice)
Pretty Cure All Stars New Stage: Friends of the Future (2012)
as Flappy
Pretty Cure All Stars DX2: The Light of Hope - Protect the Rainbow Jewel! (2010)
as Flappy (voice)
One Piece Episode of Sabo: The Three Brothers' Bond - The Miraculous Reunion and the Inherited Will (2015)
as Usopp (voice)
Ranma 1/2 the Movie: Big Trouble in Nekonron, China (1991)
as Ranma Saotome ♂ (voice)
Camp Pikachu (2002)
as Barubeat (voice)
Dead Leaves (2004)
as Retro (voice)
A Tree of Palme (2002)
as Roualt (voice)
Case Closed: Zero the Enforcer (2018)
as Shinichi Kudo / Kaito Kid (voice)
Pretty Cure All Stars DX: Everyone Is a Friend - A Miracle All Pretty Cures Together (2009)
as Flappy (voice)
Ressha Sentai ToQger vs. Kamen Rider Gaim: Spring Break Combined Special (2014)
as Ticket / ToQger Equipment (voice)
One Piece Episode of Merry: The Tale of One More Friend (2013)
as Usopp (voice)
Peacemaker Kurogane: Belief (2018)
as Shinpachi Nagakura (voice)
The Adventures of Tyrano Boy (2015)
as Zesta (voice)
Heart and Yummie (2010)
as Heart (voice)
Detective Conan: The Scarlet School Trip (2019)
as Shinichi Kudo (voice)
Hanappe Bazooka (1992)
as Hanahei Yamada (voice)
Space Battleship Yamato Resurrection (2009)
as Ryohei Nakanishi (voice)
Nineteen 19 (1990)
as Hiroaki Kusano (voice)
Pretty Cure All Stars DX3: Deliver the Future! The Rainbow-Colored Flower That Connects the World (2011)
as Flappy
A Wind Named Amnesia (1990)
as Johnny (voice)
Asura (2012)
Actor
One Piece: Romance Dawn Story (2008)
as Usopp (voice)
Kindaichi Case Files Movie 1: The Opera House Murders (1996)
as Hajime Kindaichi (Voice)
Delinquent in Drag (1992)
as Suke Banji (voice)
One Piece Episode of Alabasta Prologue (2011)
as Usopp (voice)
Alice in Wonderland –Dive in Wonderland– (2025)
as The White Rabit (voice)
Netrun-mon the Movie (2004)
as BB Runner
ODDTAXI in the Woods (2022)
as Eiji Kakihana (voice)
Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai (2014)
as ToQger Equipment Voice
Ranma ½: Nightmare! Incense of Spring Sleep (2008)
as Ranma Saotome ♂ (voice)
Luffy's Fall! The Unexplored Region - Grand Adventure in the Ocean's Navel (2000)
as Usopp (voice)
Chibi Maruko-chan (2019)
as Kenichi Oono (voice)
Chibi Maruko-chan: My Favorite Song (1992)
as Kenichi Oono (voice)
Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread! (2006)
as Flappy (voice)
Atashin'chi: The 3D Movie (2010)
as Fujino (voice)
Case Closed: The Fist of Blue Sapphire (2019)
as Shinichi Kudo / Kaito Kuroba (voice)
Ressha Sentai ToQger The Movie: Galaxy Line S.O.S. (2014)
as Ticket / ToQger Equipment / Narrator (voice)
Yona Yona Penguin (2009)
as Mulmul (voice)
One Piece Special: Protect! The Last Great Stage (2003)
as Usopp (voice)
Butt Attack Punisher Girl Gautaman: The Birth of Gautaman (1994)
as Shibuya (voice)
Ressha Sentai ToQger Returns: Super ToQ #7 of Dreams (2015)
as Ticket (voice)
Ultraman Super Fighter Legend (1996)
as Astra / Announcer Banjou (voice)
Violence Jack: Hell's Wind (1990)
as Saburo Tenma
Shuriken Sentai Ninninger vs. ToQger the Movie: Ninjas in Wonderland (2016)
as Ticket (voice), ToQger Equipment Voice
Coicent (2010)
as White Deer (voice)
Inferious Interplanetary War Chronicle - Condition Green (1991)
as Oscar Cloud (voice)
Tokyo Babylon 1 (1992)
as Subaru Sumeragi
One Piece Special: The Detective Memoirs of Chief Straw Hat Luffy (2005)
as Usopp (voice)
Futari wa Precure Splash☆Star: Maji Doki Theater (2006)
as Flappy (voice)
One Piece: Glorious Island (2012)
as Usopp (voice)
Pretty Guardian Sailor Moon: Act Zero (2005)
Actor
One Piece 3D: Gekisou! Trap Coaster (2011)
as Usopp (voice)
Super Sentai Strongest Battle Director's Cut (2019)
as ToQger Arsenal (voice)
Tokyo Babylon 2 (1994)
as Subaru Sumeragi
Tottoi (1992)
as Billia (voice)
Noiseman Sound Insect (1997)
as Manabu (voice)
Ryokunohara Labyrinth - Sparkling Phantom (1990)
as Kanata Tokino
Urusei Yatsura: The Obstacle Course Swim Meet, It's a Rumic World: Urusei Yatsura (2008)
as (voice)
Mouse Story: The Adventures of George and Gerald (2007)
as Chamberlain
Crows (1994)
Actor
Eternal Family (1997)
as Sasuke (voice)
Kishin Douji Zenki Gaiden: Anki Kitan (1997)
as Zenki
Persona4 the ANIMATION -The Factor of Hope- (2012)
as Kuma (voice)
TIGER & BUNNY: The Beginning (2012)
as Robin Baxter (voice)
Dragon Knight: Wheel of Time (1998)
as Kakeru
Butt Attack Punisher Girl Gautaman R: The Final Battle Between Love & Tragedy! (1994)
as Shibuya (voice)
Serena x One Piece: Sennyuu!! Sauzando Sunny-gou (2011)
as Usopp (voice)
The Heroic Legend of Arslan II (1992)
Actor
Tomcat's Big Adventure (2014)
as Michael (voice)
Giant Robo: The Day the Earth Stood Still (1992)
as Daisaku Kusama
Dragon Quest - Emblem of Roto (1996)
Actor
One Piece: The Great Treasure of Tongari Island (2016)
as Usopp (voice)
Gosho Aoyama’s Collection of Short Stories (1999)
Actor
Magical Circle Guru Guru (1996)
Actor
Pretty Guardian Sailor Moon Special Act: We're Getting Married!！ (2004)
Actor
Nagasaki 1945 ~ The Angelus Bells (2005)
Actor
Detective Conan: The 17-Year-Old Truth (2025)
as Shinichi Kudo (voice)
Bronze: Zetsuai Since 1989 (1996)
as Shibuya (voice)
Boyfriend (1992)
as Ougi (voice)
Shadow Skill: Epilogue (1995)
as Scrib Lowengren (voice)
Welcome to Lodoss Island! (1998)
as Etoh (voice)
Madara (1991)
as (voice)
Ressha Sentai ToQger DVD Special: Farewell, Ticket! The Wasteland Super ToQ Battle! (2014)
as Ticket (voice)
Ressha Sentai ToQger Final Live Tour 2015 (2015)
as Ticket / ToQger Equipment Voice (voice)
Shadow Skill: The Movie (1996)
as Scrib Lowengren
Detective Conan: Black History (2007)
Actor
Kamiwaza Wanda (2017)
Actor
It's a Rumic World: 50th Anniversary Weekly★Shonen Sunday (2008)
as Inuyasha / Ranma Saotome ♂ (voice)
Silent Mobius Gaiden: The End of the Edo Period (1993)
Actor
The Heroic Legend of Arslan (1991)
Actor
Blue Memories: Boys, Colonizing Manchuria and Mongolia (1993)
as Kyota Suzuki (voice)
Devil Hunter Yohko (1990)
Actor
Baby Felix & Friends (2000)
as Poindexter
Neighborhood Story The Movie (1996)
as Tsutomu Yamaguchi (voice)
Appleland Story (1992)
as Virgil
Samurider: Nazo no Tenkousei (1991)
as 山口
Barefoot Gin Rei (1994)
as Daisaku Kusama (voice)
Trusty Ginjiro (1991)
as Ginjiro Yamazaki (voice)
Virgin Fleet (1998)
as Sada
Bonobono: Secret of the Kumomo Tree (2002)
as Araiguma-kun
Bondage Queen Kate (1994)
as Dick (voice)
One Piece - En route vers l'épisode 1000 (2021)
as Comédien de doublage de Usopp – Japon
Conan vs. Kaito Kid (1997)
as Kaito Kid
Pokémon Mystery Dungeon: Explorers of Time & Darkness (2007)
as Chimchar (voice)
The Mighty Gin Rei (1994)
as Daisaku Kusama (voice)
K.O. Beast (1992)
Actor
Engimon (2018)
Actor
Stage Play 「Spooky Kitaro」 (2025)
Actor
My Dread is School! Kanako Inuki Shout Collection (1999)
as Bukita
Tomorrow Will Be Better! Half a Sweet Potato (2005)
Actor
Okaeri: Furusato no Karatsu (2017)
as Sora Hiroi (voice)
VISUALIVE Persona 4 (2012)
as Kuma (voice)
Pichu & Pikachu's Winter Vacation 2001 (2000)
as Delibird (voice)
Desperate Love 1989 (1992)
as Katsumi Shibuya (voice)
One Piece: The Adventure in Grand Line (2002)
as Usopp (voice)
Detective Conan Magic File (2007)
Actor
Unification of Japan Gaiden: Yamazaki Family — Joji and His Merry Friends (2024)
Actor
Twinbee PARADISE (1998)
Actor
La Blue Girl: Climax Taizen (2002)
as Nin-Nin