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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.

Assassination Classroom the Movie: Our Time
as Futoshi (voice)

Gintama: Yoshiwara in Flames
as Inorin (voice)
BEAT RUNNERS
as Vivace (voice)

Mechanical Marie
as Carl Ojisan (voice)

Detective Conan: The 17-Year-Old Truth
as Shinichi Kudo (voice)

Alice in Wonderland –Dive in Wonderland–
as The White Rabit (voice)

Stage Play 「Spooky Kitaro」

Detective Conan: One-Eyed Flashback
as Shinichi Kudo (voice)

Ranma1/2
as Ranma Saotome (voice)

Mecha-Ude: Mechanical Arms
as Yakumo (voice)

Unification of Japan Gaiden: Yamazaki Family — Joji and His Merry Friends

Detective Conan: The Million-Dollar Pentagram
as Kaito Kid / Shinichi Kudou (voice)

Train to the End of the World
as Shizuru's father (voice)

Bakuage Sentai Boonboomger
as Ticket (voice)

BUCCHIGIRI?!
as Komao (voice)

Detective Conan vs. Kid the Phantom Thief
as Kaito Kuroba / Kaito Kid (voice)

Detective Conan: Black Iron Submarine
as Shinichi Kudou (voice)

Detective Conan: The Story of Ai Haibara: Black Iron Mystery Train
as Kaito Kuroba (voice)

Urusei Yatsura
as Saizo (voice)

One Piece Film Red
as Usopp (voice)

Detective Conan: The Bride of Halloween
as Shinichi Kudo (voice)

Miss Shachiku and the Little Baby Ghost
as "Cute" Voiceover of the Week (voice)

Estab-Life: Great Escape
as Mikhail (voice)

ODDTAXI in the Woods
as Eiji Kakihana (voice)

One Piece - En route vers l'épisode 1000
as Comédien de doublage de Usopp – Japon

The Ancient Magus' Bride: The Boy from the West and the Knight of the Blue Storm
as Oberon (voice)

Detective Conan: The Scarlet Bullet
as Shinichi Kudo (voice)

Space Academy
as Jii-chan (voice)

ODDTAXI
as Eiji Kakihana (voice)

航海王:和之国总集篇
as 配音

One Pace
as Usopp

The Gymnastics Samurai
as Bigbird Aragaki (voice)

JUJUTSU KAISEN
as Kechizu (voice)

Yashahime: Princess Half-Demon
as Inuyasha (voice)

BOFURI: I Don't Want to Get Hurt, so I'll Max Out My Defense.
as Shin (voice)

Detective Conan: The Scarlet School Trip
as Shinichi Kudo (voice)

Super Sentai Strongest Battle Director's Cut
as ToQger Arsenal (voice)

Vinland Saga
as Jabbathe (voice)

Chibi Maruko-chan
as Kenichi Oono (voice)

Case Closed: The Fist of Blue Sapphire
as Shinichi Kudo / Kaito Kuroba (voice)

Super Sentai Strongest Battle!!
as ToQger Arsenal (voice)

One Piece: Stampede
as Usopp (voice)

RADIANT
as Master Lord Majesty (voice)

One Piece: Episode of Skypiea
as Usopp (voice)

Super Dragon Ball Heroes
as Fu (voice)

Peacemaker Kurogane: Belief
as Shinpachi Nagakura (voice)

Case Closed: Zero the Enforcer
as Shinichi Kudo / Kaito Kid (voice)

GeGeGe no Kitaro
as Ittan Momen

Engimon

One Piece Episode of East Blue
as Usopp (voice)

Mazinger Z: Infinity
as Mucha (voice)

The Ancient Magus' Bride
as Oberon (voice)

Case Closed: The Crimson Love Letter
as Shinichi Kudo (voice)

Makeruna!! Aku no Gundan!
as Pepu (voice)

Okaeri: Furusato no Karatsu
as Sora Hiroi (voice)

Kamiwaza Wanda

Detective Conan: Episode One - The Great Detective Turned Small
as Shinichi Kudo (voice)

One Piece: Heart of Gold
as Usopp (voice)

One Piece: The Great Treasure of Tongari Island
as Usopp (voice)

One Piece Film: GOLD
as Usopp (voice)