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 Million-Dollar Pentagram (2024)
as Kaito Kid / Shinichi Kudou (voice)
Detective Conan: Quarter of Silence (2011)
as Shinichi Kudo (voice)
Gintama the Movie 2026: Yoshiwara in Flames (2026)
as Inorin (voice)
One Piece Film Red (2022)
as Usopp (voice)
One Piece: Baron Omatsuri and the Secret Island (2005)
as Usopp (voice)
Assassination Classroom the Movie: Our Time (2026)
as Futoshi (voice)
Detective Conan: One-Eyed Flashback (2025)
as Shinichi Kudo (voice)
Mazinger Z: Infinity (2017)
as Mucha (voice)
The Boy and the Beast (2015)
as Teenage Jiromaru (voice)
One Piece: Curse of the Sacred Sword (2004)
as Usopp (voice)
One Piece Film: Z (2012)
as Usopp (voice)
Detective Conan: The Phantom of Baker Street (2002)
as Shinichi Kudo (voice)
Detective Conan: Black Iron Submarine (2023)
as Shinichi Kudou (voice)
One Piece: Episode of Skypiea (2018)
as Usopp (voice)
One Piece Film: Strong World (2010)
as Usopp (voice)
Detective Conan: The Disappearance of Conan Edogawa - The Worst Two Days in History (2015)
as Shinichi Kudo (voice)
Case Closed: Countdown to Heaven (2001)
as Shinichi Kudo (voice)
Detective Conan: Captured in Her Eyes (2000)
as Shinichi Kudo (voice)
Detective Conan: The Time Bombed Skyscraper (1997)
as Shinichi Kudo (voice)
One Piece Film: GOLD (2016)
as Usopp (voice)
One Piece Episode of East Blue (2017)
as Usopp (voice)
Luffy's Fall! The Unexplored Region - Grand Adventure in the Ocean's Navel (2000)
as Usopp (voice)
One Piece: Glorious Island (2012)
as Usopp (voice)
Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train (2023)
as Kaito Kuroba (voice)
Detective Conan: The Bride of Halloween (2022)
as Shinichi Kudo (voice)
Detective Conan: Dimensional Sniper (2014)
as Shinichi Kudo (voice)
One Piece: Jango's Dance Carnival (2001)
as Usopp (voice)
Detective Conan: Crossroad in the Ancient Capital (2003)
as Shinichi Kudo (voice)
Detective Conan: The Darkest Nightmare (2016)
as Shinichi Kudo (voice)
One Piece: Adventure of Nebulandia (2015)
as Usopp (voice)
Detective Conan: The Private Eyes' Requiem (2006)
as Shinichi Kudo (voice) / Kaito Kuroba (voice)
Case Closed: The Crimson Love Letter (2017)
as Shinichi Kudo (voice)
Detective Conan: The Raven Chaser (2009)
as Shinichi Kudo (voice)
Detective Conan: Sunflowers of Inferno (2015)
as Shinichi Kudo / Kaitou Kid (voice)
Detective Conan: The Scarlet Bullet (2021)
as Shinichi Kudo (voice)
Case Closed: The Fourteenth Target (1998)
as Shinichi Kudo (voice)
One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends (2014)
as Usopp (voice)
Detective Conan: Jolly Roger in the Deep Azure (2007)
as Shin'ichi Kudo (voice)
Detective Conan: The Lost Ship in the Sky (2010)
as Shinichi Kudo / Kaito Kid (voice)
Detective Conan: Strategy Above the Depths (2005)
as Shinichi Kudou (voice)
Detective Conan: The Counterfeit Case of Ultra 30 (2026)
as Shinichi Kudo (voice)
Detective Conan: The Last Wizard of the Century (1999)
as Shinichi Kudo / Kaito Kuroba (voice)
Detective Conan: Full Score of Fear (2008)
as Shinichi Kudo (voice)
Detective Conan: Magician of the Silver Sky (2004)
as Kaito Kid / Shinichi Kudou (voice)
One Piece: Dream Soccer King! (2002)
as Usopp (voice)
Detective Conan: Private Eye in the Distant Sea (2013)
as Shinichi Kudo (voice)
One Piece: The Movie (2000)
as Usopp (voice)
Detective Conan: The Eleventh Striker (2012)
as Shinichi Kudo (voice)
One Piece Mugiwara Chase (2011)
as Usopp (voice)
Death Note Relight 1: Visions of a God (2007)
as L (voice)
Lupin the Third vs. Detective Conan (2009)
as Shinichi Kudo (voice)
Ranma 1/2: Team Ranma vs. the Legendary Phoenix (1994)
as Ranma Saotome ♂ (voice)
One Piece: Clockwork Island Adventure (2001)
as Usopp (voice)
One Piece: Giant Mecha Soldier of Karakuri Castle (2006)
as Usopp (voice)
One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream! (2003)
as Usopp (voice)
One Piece: The Desert Princess and the Pirates: Adventure in Alabasta (2007)
as Usopp / Lashes (voice)
Lupin the Third vs. Detective Conan: The Movie (2013)
as Shinichi Kudo / Kaito Kuroba (voice)
Zyuden Sentai Kyoryuger vs. Go-Busters: The Great Dinosaur War (2014)
as ToQger equipment (voice)
One Piece Episode of Sabo: The Three Brothers' Bond - The Miraculous Reunion and the Inherited Will (2015)
as Usopp (voice)
One Piece: Dead End Adventure (2003)
as Usopp (voice)
Nineteen 19 (1990)
as Hiroaki Kusano (voice)
Twinbee PARADISE (1998)
Actor
Death Note Relight 2: L's Successors (2009)
as L (voice)
Inuyasha the Movie: Affections Touching Across Time (2001)
as Inuyasha (voice)
Inuyasha the Movie 3: Swords of an Honorable Ruler (2003)
as Inuyasha (voice)
Ressha Sentai ToQger vs. Kamen Rider Gaim: Spring Break Combined Special (2014)
as Ticket / ToQger Equipment (voice)
One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008)
as Usopp (voice)
Serena x One Piece: Sennyuu!! Sauzando Sunny-gou (2011)
as Usopp (voice)
Battle Angel (1993)
as Yūgo (voice)
One Piece Episode of Alabasta Prologue (2011)
as Usopp (voice)
Nagasaki 1945 ~ The Angelus Bells (2005)
Actor
Inuyasha the Movie 2: The Castle Beyond the Looking Glass (2002)
as Inuyasha (voice)
Ranma 1/2 the Movie 2: Nihao My Concubine (1992)
as Ranma Saotome ♂ (voice)
Animal Crossing: The Movie (2006)
as Fûta (voice)
One Piece: Chopper's Kingdom in the Strange Animal Island (2002)
as Usopp (voice)
Dream 9 Toriko x One Piece x Dragon Ball Z Super Collaboration Special!! (2013)
as Usopp (voice)
One Piece: Heart of Gold (2016)
as Usopp (voice)
One Piece Episode of Merry: The Tale of One More Friend (2013)
as Usopp (voice)
Detective Conan: Episode One - The Great Detective Turned Small (2017)
as Shinichi Kudo (voice)
Escaflowne: The Movie (2000)
as Shesta (voice)
Inuyasha the Movie 4: Fire on the Mystic Island (2004)
as Inuyasha (voice)
Ressha Sentai ToQger vs. Kyoryuger: The Movie (2015)
as Ticket (voice)
A Wind Named Amnesia (1990)
as Johnny (voice)
Atashin'chi: The 3D Movie (2010)
as Fujino (voice)
Hunter x Hunter: Phantom Rouge (2013)
as Feitan (voice)
Yu-Gi-Oh! Bonds Beyond Time (2010)
as Daitokuji (voice)
Urotsukidōji II: Legend of the Demon Womb (1991)
as Young Munchausen II (voice)
Ranma 1/2 the Movie: Big Trouble in Nekonron, China (1991)
as Ranma Saotome ♂ (voice)
One Piece Fan Letter (2024)
as Usopp
Inferious Interplanetary War Chronicle - Condition Green (1991)
as Oscar Cloud (voice)
Samurai X: The Motion Picture (1997)
as Yasuharu Musashino
One Piece 3D: Gekisou! Trap Coaster (2011)
as Usopp (voice)
One Piece: Episode of Luffy - Hand Island Adventure (2012)
as Usopp (voice)
Kamiwaza Wanda (2017)
Actor
Detective Conan: Black History (2007)
Actor
One Piece: Romance Dawn Story (2008)
as Usopp (voice)
One Piece: The Great Treasure of Tongari Island (2016)
as Usopp (voice)
Stage Play 「Spooky Kitaro」 (2025)
Actor
Pretty Guardian Sailor Moon Special Act: We're Getting Married!！ (2004)
Actor
ODDTAXI in the Woods (2022)
as Eiji Kakihana (voice)
One Piece: Stampede (2019)
as Usopp (voice)
Urusei Yatsura: The Obstacle Course Swim Meet, It's a Rumic World: Urusei Yatsura (2008)
as (voice)
HANAKAPPA's Traffic Safety: Turn Right, Left, Right in Search of a Cake (2013)
as Garizo (voice)
Conan vs. Kaito Kid (1997)
as Kaito Kid
Grappler Baki: The Ultimate Fighter (1994)
as Baki Hanma
Detective Conan vs. Kid the Phantom Thief (2024)
as Kaito Kuroba / Kaito Kid (voice)
Case Closed: Zero the Enforcer (2018)
as Shinichi Kudo / Kaito Kid (voice)
Alice in Wonderland –Dive in Wonderland– (2025)
as The White Rabit (voice)
One Piece Film Gold: Episode 0 (2016)
as Usopp (voice)
Devil Hunter Yohko (1990)
Actor
Bonobono: Secret of the Kumomo Tree (2002)
as Araiguma-kun
Planetarium HANAKAPPA: Bloom! Pop! Space Travel (2018)
as Garizo (voice)
One Piece Episode of Nami: Tears of a Navigator and the Bonds of Friends (2012)
as Usopp (voice)
The Heroic Legend of Arslan II (1992)
Actor
Plastic Little: The Adventures of Captain Tita (1994)
as Nicole (voice)
The Adventures of Tyrano Boy (2015)
as Zesta (voice)
TIGER & BUNNY: The Beginning (2012)
as Robin Baxter (voice)
Heart and Yummie (2010)
as Heart (voice)
Appleland Story (1992)
as Virgil
One Piece: The Adventure in Grand Line (2002)
as Usopp (voice)
Pokémon: Pikachu's Rescue Adventure (1999)
as Parasect (voice)
Dead Leaves (2004)
as Retro (voice)
A Lazy Day in Thousand Sunny (2026)
as Usopp
Detective Conan: The Scarlet School Trip (2019)
as Shinichi Kudo (voice)
Asura (2012)
Actor
Pa-Pa-Pa the Movie: Perman: Tako de Pon! Ashi wa Pon! (2004)
Actor
That's HANAKAPPA Musical: Bread or Rice, Which Is It!? (2013)
as Garizo (voice)
Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai (2014)
as ToQger Equipment Voice
Pretty Cure All Stars DX3: Deliver the Future! The Rainbow-Colored Flower That Connects the World (2011)
as Flappy
K.O. Beast (1992)
Actor
Guitar wo Motta Shounen: Kikaider VS Inazuman (2003)
as Saburo Kazeta/Inazuman
Kishin Douji Zenki Gaiden: Anki Kitan (1997)
as Zenki
Space Battleship Yamato Resurrection (2009)
as Ryohei Nakanishi (voice)
My Dread is School! Kanako Inuki Shout Collection (1999)
as Bukita
Chibi Maruko-chan (1990)
as Kenichi Oono (voice)
Mouse Story: The Adventures of George and Gerald (2007)
as Chamberlain
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 Special: Protect! The Last Great Stage (2003)
as Usopp (voice)
Butt Attack Punisher Girl Gautaman: The Birth of Gautaman (1994)
as Shibuya (voice)
Madara (1991)
as (voice)
A Tree of Palme (2002)
as Roualt (voice)
Eternal Family (1997)
as Sasuke (voice)
Pretty Cure All Stars DX: Everyone Is a Friend - A Miracle All Pretty Cures Together (2009)
as Flappy (voice)
Samurider: Nazo no Tenkousei (1991)
as 山口
Yona Yona Penguin (2009)
as Mulmul (voice)
One Piece Special: The Detective Memoirs of Chief Straw Hat Luffy (2005)
as Usopp (voice)
Tottoi (1992)
as Billia (voice)
Dragon Knight: Wheel of Time (1998)
as Kakeru
Ultraman Super Fighter Legend (1996)
as Astra / Announcer Banjou (voice)
The Mighty Gin Rei (1994)
as Daisaku Kusama (voice)
Pretty Cure All Stars DX2: The Light of Hope - Protect the Rainbow Jewel! (2010)
as Flappy (voice)
Ranma ½: Nightmare! Incense of Spring Sleep (2008)
as Ranma Saotome ♂ (voice)
Chibi Maruko-chan: My Favorite Song (1992)
as Kenichi Oono (voice)
Case Closed: The Fist of Blue Sapphire (2019)
as Shinichi Kudo / Kaito Kuroba (voice)
Delinquent in Drag (1992)
as Suke Banji (voice)
Ressha Sentai ToQger Returns: Super ToQ #7 of Dreams (2015)
as Ticket (voice)
Ressha Sentai ToQger The Movie: Galaxy Line S.O.S. (2014)
as Ticket / ToQger Equipment / Narrator (voice)
Ryokunohara Labyrinth - Sparkling Phantom (1990)
as Kanata Tokino
Violence Jack: Hell's Wind (1990)
as Saburo Tenma
Kindaichi Case Files : The Opera House Murders (1996)
as Hajime Kindaichi (Voice)
Camp Pikachu (2002)
as Barubeat (voice)
Coicent (2010)
as White Deer (voice)
Persona4 the ANIMATION -The Factor of Hope (2012)
as Kuma (voice)
Peacemaker Kurogane: Belief (2018)
as Shinpachi Nagakura (voice)
Noiseman Sound Insect (1997)
as Manabu (voice)
Hanappe Bazooka (1992)
as Hanahei Yamada (voice)
Giant Robo: The Day the Earth Stood Still (1992)
as Daisaku Kusama
Dragon Quest - Emblem of Roto (1996)
Actor
Neighborhood Story The Movie (1996)
as Tsutomu Yamaguchi (voice)
Butt Attack Punisher Girl Gautaman R: The Final Battle Between Love & Tragedy! (1994)
as Shibuya (voice)
The Heroic Legend of Arslan (1991)
Actor
Pokémon Mystery Dungeon: Explorers of Time & Darkness (2007)
as Chimchar (voice)
Netrun-mon the Movie (2004)
as BB Runner
Detective Conan: The 17-Year-Old Truth (2025)
as Shinichi Kudo (voice)
Crows (1994)
Actor
Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread! (2006)
as Flappy (voice)
Blue Memories: Boys, Colonizing Manchuria and Mongolia (1993)
as Kyota Suzuki (voice)
Gosho Aoyama’s Collection of Short Stories (1999)
Actor
HANAKAPPA: Adventure in the Butterfly Kingdom (2013)
as Garizo (voice)
Tomcat's Big Adventure (2014)
as Michael (voice)
Virgin Fleet (1998)
as Sada
Shuriken Sentai Ninninger vs. ToQger the Movie: Ninjas in Wonderland (2016)
as Ticket (voice), ToQger Equipment Voice
Detective Conan Magic File (2007)
Actor
Pretty Cure All Stars New Stage: Friends of the Future (2012)
as Flappy
Shadow Skill: Epilogue (1995)
as Scrib Lowengren (voice)
Super Sentai Strongest Battle Director's Cut (2019)
as ToQger Arsenal (voice)
Boyfriend (1992)
as Ougi (voice)
Pretty Guardian Sailor Moon: Act Zero (2005)
Actor
Ressha Sentai ToQger Final Live Tour 2015 (2015)
as Ticket / ToQger Equipment Voice (voice)
Baby Felix & Friends (2000)
as Poindexter
Trusty Ginjiro (1991)
as Ginjiro Yamazaki (voice)
One Piece - En route vers l'épisode 1000 (2021)
as Comédien de doublage de Usopp – Japon
It's a Rumic World: 50th Anniversary Weekly★Shonen Sunday (2008)
as Inuyasha / Ranma Saotome ♂ (voice)
Barefoot Gin Rei (1994)
as Daisaku Kusama (voice)
Silent Mobius Gaiden: The End of the Edo Period (1993)
Actor
Welcome to Lodoss Island! (1998)
as Etoh (voice)
Shadow Skill: The Movie (1996)
as Scrib Lowengren
Desperate Love 1989 (1992)
as Katsumi Shibuya (voice)
Tokyo Babylon 1 (1992)
as Subaru Sumeragi
Tokyo Babylon 2 (1994)
as Subaru Sumeragi
Engimon (2018)
Actor
Bronze: Zetsuai Since 1989 (1996)
as Shibuya (voice)
Tomorrow Will Be Better! Half a Sweet Potato (2005)
Actor
Unification of Japan Gaiden: Yamazaki Family — Joji and His Merry Friends (2024)
Actor
Futari wa Precure Splash☆Star: Maji Doki Theater (2006)
as Flappy (voice)
Okaeri: Furusato no Karatsu (2017)
as Sora Hiroi (voice)
Magical Circle Guru Guru (1996)
Actor
Pichu & Pikachu's Winter Vacation 2001 (2000)
as Delibird (voice)
Ressha Sentai ToQger DVD Special: Farewell, Ticket! The Wasteland Super ToQ Battle! (2014)
as Ticket (voice)
VISUALIVE Persona 4 (2012)
as Kuma (voice)
La Blue Girl: Climax Taizen (2002)
as Nin-Nin
Bondage Queen Kate (1994)
as Dick (voice)