Toshihiko Seki
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Toshihiko Seki, born on June 11, 1962, in Sendai, Miyagi Prefecture, Japan, is a celebrated Japanese voice actor, actor, singer, and narrator. He has been active in the entertainment industry since 1983 and is affiliated with 81 Produce, a prominent talent agency. Seki is known for his versatility, often voicing characters with serious or easily agitated personalities, such as Duo Maxwell in Mobile Suit Gundam Wing, Iruka Umino in Naruto, Kaien Shiba in Bleach and Riki in Ai no Kusabi. He has also portrayed deranged villains like Legato Bluesummers in Trigun and Muzan Kibutsuji in Demon Slayer: Kimetsu no Yaiba. One of his most iconic roles is Momotaros in Kamen Rider Den-O, a character he has reprised in numerous productions. In addition to his work in anime, Seki has contributed to video games, movies, and dubbing. His talent and dedication have earned him recognition, including being ranked as the 9th favorite voice actor in the 26th Annual Reader's Poll by Animage Magazine in 2004.
Known for
Credits
Demon Slayer: Kimetsu no Yaiba Infinity Castle (2025)
as Muzan Kibutsuji (voice)
Castle in the Sky (1986)
as (voice)
Black Clover: Sword of the Wizard King (2023)
as Conrad Leto (voice)
Detective Conan: Quarter of Silence (2011)
as Shogo Hikawa (voice)
Road to Ninja: Naruto the Movie (2012)
as Iruka Umino (voice)
Ocean Waves (1993)
as Yutaka Matsuno (voice)
Mazinger Z: Infinity (2017)
as Tetsuya Tsurugi (voice)
My Hero Academia: World Heroes' Mission (2021)
as Eddie Soul (voice)
Ninja Scroll (1993)
as Yurimaru (voice)
X (1996)
as Shougo
Hades Project: Zeorymer Extinction (1989)
as Masato Akitsu / Masaki Kihara (voice)
Saiyuki: Requiem (2001)
as Genjo Sanzo (voice)
Kamen Rider × Super Sentai: Super Hero Wars (2012)
as Momotaros - Kamen Rider Den-O Sword Form (voice)
Kamen Rider × Super Sentai: Ultra Super Hero Wars (2017)
as Momotaros - Kamen Rider Den-O Sword Form (voice)
Hunter x Hunter: The Last Mission (2013)
as Wing (voice)
Kamen Rider Heisei Generations Forever (2018)
as Momotaros / Kamen Rider Den-O Sword Form (voice)
Ranma 1/2 the Movie 2: Nihao My Concubine (1992)
as Mousse (voice)
Demon Slayer: Kimetsu no Yaiba - Sibling's Bond (2019)
as Muzan Kibutsuji (voice)
Kamen Rider Decade: All Riders vs. Dai-Shocker (2009)
as Momotaros / Kamen Rider Den-O (voice)
Ranma 1/2 the Movie: Big Trouble in Nekonron, China (1991)
as Mousse (voice)
Inferious Interplanetary War Chronicle - Condition Green (1991)
as Soo Laform (voice)
Chō Uchū Keiji Gyaban Infiniti Taiyō ga Naita Hi (2026)
as Cosmo Gavarion System Voice / Gavarion Trigger System Voice
Nintama Rantarō: Invincible Master of the Dokutake Ninja (2024)
as Hansuke Doi (voice)
Twilight of the Dark Master (1997)
as Shijo Tsunami (voice)
The Birth of Kitaro: The Mystery of GeGeGe (2023)
as Kitarou's Father (voice)
Gundam Wing: The Endless Waltz (1998)
as Duo Maxwell (voice)
The Samurai (1987)
as Takeshi Chimatsuri
Naruto OVA 12: The Day Naruto Became Hokage (2016)
as Iruka Umino (voice)
Goddamn (1990)
as Hans Schultz
Wild 7: Biker Knights (1994)
as Dairoku Hiba
Super Space Sheriff Gavan Infinity: Jo-Chaku Course (2026)
as Gavarion Trigger System Voice (voice)
Kamen Rider Saber + Kikai Sentai Zenkaiger: Super Hero Chronicles (2021)
as Momotaros (voice) / Kamen Rider Den-O (voice)
Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai (2014)
as Kamen Rider Den-O Sword Form (voice)
Kamen Rider Den-O & Kiva: Climax Deka (2008)
as Momotaros (voice)
Nintama Rantaro the Movie: Ninjutsu Academy - All Hands on Deck! (2011)
as Hansuke Doi (voice)
TOKYO CITY Melhen 2 (1990)
Actor
Demon Slayer: Kimetsu no Yaiba - Asakusa Arc (2022)
as Muzan Kibutsuji (voice)
Kamen Rider Den-O The Movie: I'm Born! (2007)
as Momotaros (voice)
Bio Hunter (1995)
as Komada
Kamen Rider Kiva: King of the Castle in the Demon World (2008)
as Penetentiary Officer Sanjo
OOO, Den-O, All Riders: Let's Go Kamen Riders (2011)
as Momotaros / Kamen Rider Den-O Sword Form (voice)
Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship (2009)
as Momotaros (voice)
Legend of Crystania: The Motion Picture (1995)
as Nasser (voice)
Campus Special Investigator Hikaruon (1987)
as Hikaru Shihodo / Hikaruon (voice)
Angel Cop (1989)
as Tachihara (voice)
Kamen Rider × Kamen Rider W & Decade: Movie War 2010 (2009)
as Kamen Rider Den-O (voice)
Sunlight All Around! Ka - su - mi: You Were in My Dreams (1988)
as Reporter B (voice)
Call Me Tonight (1986)
as Hayata (voice)
Love Wedge 2 (1994)
as Riki (voice)
Nadia: The Secret of Blue Water - Nautilus Story II (1991)
as Fate (voice)
Genocyber (1994)
as Sakomizu (voice)
Farewell Kamen Rider Den-O: Final Countdown (2008)
as Momotaros (voice)
Ultraman Super Fighter Legend (1996)
as Ultraseven / Ultraman Leo (voice)
Love Wedge 1 (1992)
as Riki (voice)
Nadia: The Secret of Blue Water - The Motion Picture (1991)
as Falt (voice)
The Irresponsible Captain Tylor: Tylor's War (1994)
as Ru Baraba Dom (voice)
Hades Project: Zeorymer Separation (1988)
as Masaki Kihara (voice)
Ryokunohara Labyrinth - Sparkling Phantom (1990)
as Hiroki Imashi
Kamen Rider Den-O: Final Trilogy Special Edition (2008)
as Momotaros (voice)
Mobile Suit Gundam: The Origin II – Artesia's Sorrow (2015)
as Char Aznable (voice)
Super Kamen Rider Den-O Trilogy - Episode Red: Zero's Star Twinkle (2010)
as Momotaros (voice)
The Weathering Continent (1992)
as Tieh (voice)
Higurashi: When They Cry - Outbreak (2013)
as Kyousuke Irie (voice)
Animation Store Manager (2002)
as Ryuu Raiba (voice)
Balthus: Tia's Radiance (1988)
as Eud (voice)
OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~ (2011)
as Momotaros (voice)
Super Kamen Rider Den-O Trilogy - Episode Yellow: Treasure de End Pirates (2010)
as Momotaros (voice)
Kamen Rider Den-O: Singing, Dancing, Great Training!! (2007)
as Momotaros (voice)
Kaze wo Nuke! (1988)
Actor
Suikoden Demon Century (1993)
as Takateru Suga (voice)
Scarlet Demon (1989)
Actor
Midoriyama High School, Koshien Edition (Movie) (1990)
Actor
Super Kamen Rider Den-O Trilogy - Episode Blue: The Dispatched Imagin is Newtral (2010)
as Momotaros (voice)
Marina the Manga Artist Goes to Camelot (1990)
as Bijomaru Shizuka (voice)
Moonlight Pierce (1991)
as Hiroshi Takama (voice)
Reign: The Conqueror Movie (2000)
as Alexander
Violinist of Hamelin: The Movie (1996)
as Raiel (voice)
Zillion: Burning Night (1988)
as J.J. (voice)
TO-Y (1987)
as Shouji (voice)
Calico Cat Holmes and the Lord of the Haunted Castle (1992)
as Yoshitaro Katayama (voice)
Hisashi Eguchi's Kotobuki Goro Show (1991)
as Piston Akagi (voice)
Kamen Rider Den-O: The Birth of Pretty Den-O! (2020)
as Momotaros (voice)
Kamen Rider Den-O: Final Stage (2007)
as Momotaros
Oruorane the Cat Player (1992)
as The Cellist
10th Anniversary Project: Masked Rider LIVE & SHOW (2009)
as Kamen Rider Den-O Sword Form (voice)
Download: Devil's Circuit (1992)
as Sid (voice)
Momotaros' Summer Vacation (2007)
as Momotaros (voice)
The End of the Century Darling (1996)
as Todorokki Kouhei (voice)
Kiss Me on the Apple of My Eye (1993)
as Naoto (voice)
Demon Hunter Makaryūdo (1989)
as Shou Kurogane (voice)
Maryuu Senki (1987)
Actor
Paranoia Agent: Part 1 (2004)
as まにわ みつひろ
Handsome Girl (1991)
as Ichiya Kumagai (voice)
Dorami-chan: A Blue Straw Hat (1994)
as Crow (voice)
Baby Felix & Friends (2000)
as Felix The Cat
Yawara! Go Get 'Em, Wimpy Kids!! (1992)
as (voice)
Trusty Ginjiro (1991)
as Hideki Mitsui (voice)
Crayon Shin-chan Midsummer Night: I Have Arrived! The Storm is Called Den-O vs. Shin-O! 60 Minute Special!! (2007)
as Momotaros (voice)
Dragon Century (1988)
as Carmine (voice)
I'm Not an Angel! (1994)
as Bunta Kouno (voice)
Milky Passion: Dougenzaka - The Castle of Love (1990)
as Ootsuki (voice)
Imagin Anime: Momotaros Forever!/Imajin Terminal Station (2008)
as Momotaros (voice)
Kamen Rider Kiva & Den-O: DenLiner, Into Space! (2009)
as Momotaros (voice)
Momotaros' King of the Crimson Castle (2008)
as Momotaros (voice)
Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!- (2009)
as Momotaros (voice)
Cinderella Express (1989)
as Yuji Shimano
Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!- (2017)
as Momotaros
Kamen Rider × Kamen Rider × Kamen Rider The Movie Cho-Den-O Trilogy Movie Released Memorial Special Stage: Imagin Super Climax Tour 2010 (2010)
Actor
Saiyuki Interactive (2002)
Actor
Kamen Rider Decade: Final Stage (2010)
as Momotaros / Kamen Rider Den-O (Sword Form)
Yuukan Club (1991)
Actor
Yawara! Atlanta Special (1996)
Actor
Heart-Coloured Killer Ticket (1990)
as Chuta Misora (voice)
Chimera: Angel of Death (1997)
as Ron (voice)