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