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.
| Movie | Detective Conan: One-Eyed Flashback | Shinichi Kudo (voice) | 2025-04-18 |
| Movie | Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train | Kaito Kuroba (voice) | 2023-01-06 |
| Movie | Detective Conan: Black Iron Submarine | Shinichi Kudou (voice) | 2023-04-14 |
| Movie | Detective Conan: The Bride of Halloween | Shinichi Kudo (voice) | 2022-04-15 |
| Movie | One Piece Film Red | Usopp (voice) | 2022-08-06 |
| Movie | One Piece: Stampede | Usopp (voice) | 2019-01-03 |
| Movie | Case Closed: The Fist of Blue Sapphire | Shinichi Kudo / Kaito Kuroba (voice) | 2019-04-12 |
| Movie | Chibi Maruko-chan | Kenichi Oono (voice) | 2019-04-18 |
| Movie | Detective Conan: The Scarlet School Trip | Shinichi Kudo (voice) | 2019-11-22 |
| Movie | Case Closed: Zero the Enforcer | Shinichi Kudo / Kaito Kid (voice) | 2018-04-13 |
| Movie | Peacemaker Kurogane: Belief | Shinpachi Nagakura (voice) | 2018-06-02 |
| Movie | One Piece: Episode of Skypiea | Usopp (voice) | 2018-08-25 |
| Movie | Detective Conan: Episode One - The Great Detective Turned Small | Shinichi Kudo (voice) | 2017-01-20 |
| Movie | One Piece Episode of East Blue | Usopp (voice) | 2017-08-26 |
| Movie | Case Closed: The Crimson Love Letter | Shinichi Kudo (voice) | 2017-04-15 |
| Movie | One Piece: Episode of East Blue | Usopp (voice) | 2017-08-26 |
| Series | The Ancient Magus' Bride | Oberon (voice) | 2017-10-08 |
| Movie | Mazinger Z: Infinity | Mucha (voice) | 2017-10-27 |
| Series | Showa Genroku Rakugo Shinju | Amaken (voice) | 2016-01-09 |
| Movie | Shuriken Sentai Ninninger vs. ToQger the Movie: Ninjas in Wonderland | Ticket (voice), ToQger Equipment Voice | 2016-01-23 |
| Movie | One Piece Film: GOLD | Usopp (voice) | 2016-07-23 |
| Movie | Detective Conan: The Darkest Nightmare | Shinichi Kudo (voice) | 2016-04-16 |
| Movie | The Disappearance of Conan Edogawa: The Worst Two Days in History | Shin'ichi Kudou (voice) | 2015-01-30 |
| Series | Rin-ne | Sabato Rokudou | 2015-04-04 |
| Movie | Ressha Sentai ToQger vs. Kyoryuger: The Movie | Ticket (voice) | 2015-01-17 |
| Movie | Detective Conan: Sunflowers of Inferno | Shinichi Kudo / Kaitou Kid (voice) | 2015-04-18 |
| Movie | One Piece Episode of Sabo: The Three Brothers' Bond - The Miraculous Reunion and the Inherited Will | Usopp (voice) | 2015-08-22 |
| Movie | One Piece: Adventure of Nebulandia | Usopp (voice) | 2015-12-20 |
| Movie | The Adventures of Tyrano Boy | Bard (voice) | 2015-06-06 |
| Movie | The Boy and the Beast | Teenage Jiromaru (voice) | 2015-07-11 |
| Movie | Ressha Sentai ToQger Returns: Super ToQ #7 of Dreams | Ticket (voice) | 2015-06-24 |
| Movie | Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai | ToQger Equipment Voice | 2014-03-29 |
| Movie | Ressha Sentai ToQger vs. Kamen Rider Gaim: Spring Break Combined Special | Ticket / ToQger Equipment (voice) | 2014-03-30 |
| Movie | Zyuden Sentai Kyoryuger vs. Go-Busters: The Great Dinosaur War | ToQger equipment (voice) | 2014-01-18 |
| Movie | Detective Conan: The Sniper from Another Dimension | Shinichi Kudo (voice) | 2014-04-19 |
| Movie | Ressha Sentai ToQger The Movie: Galaxy Line S.O.S. | Ticket / ToQger Equipment / Narrator (voice) | 2014-07-19 |
| Series | Persona 4 The Golden Animation | Kuma | 2014-07-11 |
| Movie | Hunter x Hunter: Phantom Rouge | Feitan (voice) | 2013-01-12 |
| Movie | Detective Conan: Private Eye in the Distant Sea | Shinichi Kudo (voice) | 2013-04-19 |
| Movie | Lupin the Third vs. Detective Conan: The Movie | Shinichi Kudo / Kaito Kuroba (voice) | 2013-12-07 |
| Movie | One Piece Episode of Merry: The Tale of One More Friend | Usopp (voice) | 2013-12-31 |
| Movie | One Piece Episode of Nami: Tears of a Navigator and the Bonds of Friends | Usopp (voice) | 2012-08-25 |
| Movie | Detective Conan: The Eleventh Striker | Shinichi Kudo (voice) | 2012-04-14 |
| Movie | TIGER & BUNNY: The Beginning | Robin Baxter (voice) | 2012-09-22 |
| Series | JoJo's Bizarre Adventure | Shigechi (voice) | 2012-10-06 |
| Movie | Asura | 2012-09-29 | |
| Movie | One Piece: Episode of Luffy - Hand Island Adventure | Usopp (voice) | 2012-12-15 |
| Movie | One Piece Film: Z | Usopp (voice) | 2012-12-15 |
| Movie | Pretty Cure All Stars DX3: Deliver the Future! The Rainbow-Colored Flower That Connects the World | Flappy | 2011-03-19 |
| Movie | One Piece 3D: Straw Hat Chase | Usopp (voice) | 2011-03-19 |
| Series | Majikoi - Oh! Samurai Girls | Ikuro Fukumoto (voice) | 2011-10-02 |
| Series | Persona 4: The Animation | Kuma | 2011-10-07 |
| Movie | Pretty Cure All Stars DX2: The Light of Hope - Protect the Rainbow Jewel! | Flappy (voice) | 2010-03-14 |
| Movie | Yu-Gi-Oh!: Bonds Beyond Time | Daitokuji (voice) | 2010-01-23 |
| Movie | Detective Conan: The Lost Ship in the Sky | Shinichi Kudo / Kaito Kid (voice) | 2010-04-17 |
| Movie | Heart and Yummie | Heart (voice) | 2010-10-16 |
| Movie | Detective Conan: The Raven Chaser | Shinichi Kudo (voice) | 2009-04-18 |
| Series | Valkyria Chronicles | Unknown | 2009-04-04 |
| Movie | Lupin the Third vs. Detective Conan | Shinichi Kudo (voice) | 2009-03-27 |
| Movie | Death Note Relight 1: Visions of a God | L (voice) | 2009-09-23 |
| Movie | Death Note Relight 2: L's Successors | L (voice) | 2009-10-07 |
| Movie | Yona Yona Penguin | Mulmul (voice) | 2009-12-23 |
| Movie | One Piece Film: Strong World | Usopp (voice) | 2009-12-12 |
| Movie | Space Battleship Yamato Resurrection | Ryohei Nakanishi (voice) | 2009-12-12 |
| Movie | One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom | Usopp (voice) | 2008-03-01 |
| Series | Stitch! | Kijimuna | 2008-10-08 |
| Movie | Detective Conan: Full Score of Fear | Shinichi Kudo (voice) | 2008-04-19 |
| Movie | Detective Conan: Jolly Roger in the Deep Azure | Shin'ichi Kudo (voice) | 2007-04-21 |
| Movie | One Piece: The Desert Princess and the Pirates: Adventure in Alabasta | Usopp / Lashes (voice) | 2007-03-03 |
| Series | Baccano! | Chic Jefferson (voice) | 2007-07-27 |
| Movie | One Piece: Giant Mecha Soldier of Karakuri Castle | Usopp (voice) | 2006-03-04 |
| Movie | Angel's Feather | Hamura, Shou (voice) | 2006-04-28 |
| Movie | Animal Crossing: The Movie | Fûta (voice) | 2006-12-16 |
| Series | The Law of Ueki | Hideyoshi Soya (voice) | 2005-04-04 |
| Movie | Detective Conan: Strategy Above the Depths | Shinichi Kudou (voice) | 2005-04-09 |
| Series | Eyeshield 21 | Raimon Tarou | 2005-04-06 |
| Series | Sgt. Frog | Tororo | 2004-04-03 |
| Movie | One Piece: Curse of the Sacred Sword | Usopp (voice) | 2004-03-06 |
| Series | Doki Doki School Hours | Kenta Suetake | 2004-04-04 |
| Movie | Dead Leaves | Retro (voice) | 2004-01-17 |
| Movie | Detective Conan: Magician of the Silver Sky | Kaito Kid / Shinichi Kudou (voice) | 2004-04-17 |
| Movie | Inuyasha the Movie 4: Fire on the Mystic Island | Inuyasha (voice) | 2004-12-23 |
| Series | Yu-Gi-Oh! GX | Lyman Banner | 2004-10-06 |
| Movie | Detective Conan: Crossroad in the Ancient Capital | Shinichi Kudo (voice) | 2003-04-19 |
| Series | Papuwa | Chappy | 2003-09-30 |
| Series | Pretty Guardian Sailor Moon | Artemis (voice) | 2003-10-04 |
| Movie | Inuyasha the Movie 3: Swords of an Honorable Ruler | Inuyasha (voice) | 2003-12-20 |
| Movie | A Tree of Palme | Roualt (voice) | 2002-03-16 |
| Series | Rizelmine | Tomonori Iwaki | 2002-04-02 |
| Movie | One Piece: Dream Soccer King! | Usopp (voice) | 2002-03-02 |
| Series | Gun Frontier | Unknown | 2002-03-28 |
| Series | The Twelve Kingdoms | Rokuta (voice) | 2002-04-09 |
| Movie | Camp Pikachu | Barubeat (voice) | 2002-07-13 |
| Movie | Detective Conan: The Phantom of Baker Street | Shinichi Kudo (voice) | 2002-04-20 |
| Series | Space Pirate Captain Herlock: Outside Legend - The Endless Odyssey | Tochiro | 2002-12-21 |
| Movie | One Piece: Clockwork Island Adventure | Usopp (voice) | 2001-03-03 |
| Movie | One Piece: Jango's Dance Carnival | Usopp (voice) | 2001-03-03 |
| Movie | Case Closed: Countdown to Heaven | Shinichi Kudo (voice) | 2001-04-21 |
| Series | Angelic Layer | Unknown | 2001-04-01 |
| Movie | Inuyasha the Movie: Affections Touching Across Time | Inuyasha (voice) | 2001-12-15 |
| Movie | Detective Conan: Conan vs. Kid vs. Yaiba - The Grand Battle for the Treasure Sword!! | 2000-03-26 | |
| Movie | One Piece: The Movie | Usopp (voice) | 2000-03-04 |
| Movie | Detective Conan: Captured in Her Eyes | Shinichi Kudo (voice) | 2000-04-22 |
| Series | Android Kikaider | Saburo Kazeda (voice) | 2000-10-16 |
| Movie | Escaflowne: The Movie | Shesta (voice) | 2000-06-24 |
| Series | InuYasha | InuYasha (voice) | 2000-10-16 |
| Movie | Detective Conan: The Last Wizard of the Century | Shinichi Kudo / Kaito Kuroba (voice) | 1999-04-17 |
| Series | Eden's Bowy | Jorrne | 1999-04-06 |
| Movie | Pokémon: Pikachu's Rescue Adventure | Parasect (voice) | 1999-07-17 |
| Series | One Piece | Usopp (voice) | 1999-10-20 |
| Movie | Case Closed: The Fourteenth Target | Shinichi Kudo (voice) | 1998-04-18 |
| Series | Flint: The Time Detective | Kyoichiro Narugami | 1998-10-01 |
| Movie | Virgin Fleet | Sada | 1998-04-25 |
| Movie | Eternal Family | Sasuke (voice) | 1997-04-01 |
| Movie | Jungle de Ikou! | Takuma Kusanagi (voice) | 1997-03-26 |
| Series | Revolutionary Girl Utena | Shiori's boyfriend (voice) | 1997-04-02 |
| Movie | Detective Conan: The Time Bombed Skyscraper | Shinichi Kudo (voice) | 1997-04-19 |
| Movie | Rurouni Kenshin: Requiem for the Ishin Patriots | Yasuharu Musashino | 1997-12-20 |
| Series | CLAMP School Detectives | Unknown | 1997-05-03 |
| Series | Detective Conan | Shinichi Kudo (voice) | 1996-01-08 |
| Movie | Ultraman Super Fighter Legend | Astra / Announcer Banjou (voice) | 1996-09-25 |
| Movie | Magical Circle Guru Guru | 1996-04-20 | |
| Series | Zenki | Zenki | 1995-01-09 |
| Series | Wedding Peach | Takuro Amano | 1995-04-05 |
| Movie | Plastic Little: The Adventures of Captain Tita | Nicole (voice) | 1994-03-21 |
| Movie | Twin Dolls | Onimaru | 1994-01-02 |
| Series | Mobile Fighter G Gundam | Sai Saici (voice) | 1994-04-22 |
| Movie | Crows | 1994-01-28 | |
| Movie | Junkers Come Here | Passenger (voice) | 1994-07-20 |
| Movie | Butt Attack Punisher Girl Gautaman R: The Final Battle Between Love & Tragedy! | Shibuya (voice) | 1994-10-24 |
| Series | Captain Tsubasa J | Ryou Ishizaki (voice) | 1994-10-21 |
| Movie | Armed Dragon Fantasy Villgust | 1993-01-21 | |
| Movie | Battle Angel | Yūgo (voice) | 1993-06-21 |
| Movie | The Cockpit | Soldier Utsunomiya | 1993-10-23 |
| Movie | Please Save My Earth | Hirohiko Kazama (voice) | 1993-12-17 |
| Movie | K.O. Beast | 1992-05-02 | |
| Movie | Tottoi | Billia (voice) | 1992-01-01 |
| Movie | Giant Robo: The Day the Earth Stood Still | Daisaku Kusama | 1992-07-22 |
| Movie | Hanappe Bazooka | Hanahei Yamada (voice) | 1992-09-04 |
| Series | Tokyo Babylon | Subaru Sumeragi (voice) | 1992-10-21 |
| Movie | The Heroic Legend of Arslan | Arslan | 1991-08-07 |
| Movie | Ranma 1/2 the Movie: Big Trouble in Nekonron, China | Ranma Saotome ♂ (voice) | 1991-11-02 |
| Series | Samurai Pizza Cats | Yattarou | 1990-02-01 |
| Series | Nadia: The Secret of Blue Water | Hamahama | 1990-04-13 |
| Movie | A Wind Named Amnesia | Johnny (voice) | 1990-12-22 |
| Movie | Violence Jack: Hell's Wind | Saburo Tenma | 1990-12-21 |
| Movie | Kiki's Delivery Service | Tombo (voice) | 1989-07-29 |
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