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)
Detective Conan: Quarter of Silence (2011)
as Shogo Hikawa (voice)
X: The Movie (1996)
as Shougo
My Hero Academia: World Heroes' Mission (2021)
as Eddie Soul (voice)
Ninja Scroll (1993)
as Yurimaru (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)
Demon Slayer: Kimetsu no Yaiba - Sibling's Bond (2019)
as Muzan Kibutsuji (voice)
Ranma 1/2 the Movie 2: Nihao My Concubine (1992)
as Mousse (voice)
Chō Uchū Keiji Gyaban Infiniti Taiyō ga Naita Hi (2026)
as Cosmo Gavarion System Voice / Gavarion Trigger System Voice
Balthus: Tia's Radiance (1988)
as Eud (voice)
Kamen Rider Decade: All Riders vs. Dai-Shocker (2009)
as Momotaros / Kamen Rider Den-O (voice)
Hunter x Hunter: The Last Mission (2013)
as Wing (voice)
Demon Slayer: Kimetsu no Yaiba - Asakusa Arc (2022)
as Muzan Kibutsuji (voice)
Kamen Rider × Kamen Rider W & Decade: Movie War 2010 (2009)
as Kamen Rider Den-O (voice)
Kamen Rider × Super Sentai: Ultra Super Hero Wars (2017)
as Momotaros - Kamen Rider Den-O Sword Form (voice)
The Samurai (1987)
as Takeshi Chimatsuri
Kamen Rider Heisei Generations Forever (2018)
as Momotaros / Kamen Rider Den-O Sword Form (voice)
Kamen Rider Kiva: King of the Castle in the Demon World (2008)
as Penetentiary Officer Sanjo
Mobile Suit Gundam: The Origin II - Artesia's Sorrow (2015)
as Char Aznable (voice)
Gundam Wing: The Endless Waltz (1998)
as Duo Maxwell (voice)
OOO, Den-O, All Riders: Let's Go Kamen Riders (2011)
as Momotaros / Kamen Rider Den-O Sword Form (voice)
Ranma 1/2 the Movie: Big Trouble in Nekonron, China (1991)
as Mousse (voice)
Twilight of the Dark Master (1997)
as Shijo Tsunami (voice)
Bio Hunter (1995)
as Komada
Kamen Rider Den-O & Kiva: Climax Deka (2008)
as Momotaros (voice)
Kamen Rider Den-O The Movie: I'm Born! (2007)
as Momotaros (voice)
Nintama Rantarō: Invincible Master of the Dokutake Ninja (2024)
as Hansuke Doi (voice)
Hades Project: Zeorymer Separation (1988)
as Masato Akitsu (voice)
Kamen Rider Saber + Kikai Sentai Zenkaiger: Super Hero Chronicles (2021)
as Momotaros (voice) / Kamen Rider Den-O (voice)
Nadia: The Secret of Blue Water - The Motion Picture (1991)
as Falt (voice)
Saiyuki: Requiem (2001)
as Genjo Sanzo (voice)
Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship (2009)
as Momotaros (voice)
The Birth of Kitaro: The Mystery of GeGeGe (2023)
as Kitarou's Father (voice)
Naruto OVA 12: The Day Naruto Became Hokage (2016)
as Iruka Umino (voice)
Kamen Rider × Super Sentai: Super Hero Wars (2012)
as Momotaros - Kamen Rider Den-O Sword Form (voice)
Farewell Kamen Rider Den-O: Final Countdown (2008)
as Momotaros (voice)
Angel Cop (1989)
as Tachihara (voice)
Nintama Rantaro the Movie: Ninjutsu Academy - All Hands on Deck! (2011)
as Hansuke Doi (voice)
Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai (2014)
as Kamen Rider Den-O Sword Form (voice)
Campus Special Investigator Hikaruon (1987)
as Hikaru Shihodo / Hikaruon (voice)
Ultraman Super Fighter Legend (1996)
as Ultraseven / Ultraman Leo (voice)
Inferious Interplanetary War Chronicle - Condition Green (1991)
as Soo Laform (voice)
The Weathering Continent (1992)
as Tieh (voice)
Goddamn (1990)
as Hans Schultz
Higurashi: When They Cry - Outbreak (2013)
as Kyousuke Irie (voice)
Reign: The Conqueror Movie (2000)
as Alexander
Hades Project: Zeorymer Extinction (1989)
as Masato Akitsu / Masaki Kihara (voice)
Marina the Manga Artist Goes to Camelot (1990)
as Bijomaru Shizuka (voice)
Ryokunohara Labyrinth - Sparkling Phantom (1990)
as Hiroki Imashi
Calico Cat Holmes and the Lord of the Haunted Castle (1992)
as Yoshitaro Katayama (voice)
Super Kamen Rider Den-O Trilogy - Episode Yellow: Treasure de End Pirates (2010)
as Momotaros (voice)
Nadia: The Secret of Blue Water - Nautilus Story II (1991)
as Fate (voice)
Kiss Me on the Apple of My Eye (1993)
as Naoto (voice)
Violinist of Hamelin: The Movie (1996)
as Raiel (voice)
Genocyber (1994)
as Sakomizu (voice)
Sunlight All Around! Ka - su - mi: You Were in My Dreams (1988)
as Reporter B (voice)
Kamen Rider Den-O: Final Trilogy Special Edition (2008)
as Momotaros (voice)
Kamen Rider Den-O: Singing, Dancing, Great Training!! (2007)
as Momotaros (voice)
Yuukan Club (1991)
Actor
Kamen Rider Den-O: The Birth of Pretty Den-O! (2020)
as Momotaros (voice)
Kaze wo Nuke! (1988)
Actor
Animation Store Manager (2002)
as Ryuu Raiba (voice)
Demon Hunter Makaryūdo (1989)
as Shou Kurogane (voice)
TO-Y (1987)
as Shouji (voice)
Maryuu Senki (1987)
Actor
Super Kamen Rider Den-O Trilogy - Episode Blue: The Dispatched Imagin is Newtral (2010)
as Momotaros (voice)
I'm Not an Angel! (1994)
as Bunta Kouno (voice)
Wild 7: Biker Knights (1994)
as Dairoku Hiba
Super Kamen Rider Den-O Trilogy - Episode Red: Zero's Star Twinkle (2010)
as Momotaros (voice)
Scarlet Demon (1989)
Actor
Midoriyama High School, Koshien Edition (Movie) (1990)
Actor
Zillion: Burning Night (1988)
as J.J. (voice)
Oruorane the Cat Player (1992)
as The Cellist
Suikoden Demon Century (1993)
as Takateru Suga (voice)
Kamen Rider Decade: Final Stage (2010)
as Momotaros / Kamen Rider Den-O (Sword Form)
Handsome Girl (1991)
as Ichiya Kumagai (voice)
Download: Devil's Circuit (1992)
as Sid (voice)
Yawara! Go Get 'Em, Wimpy Kids!! (1992)
as (voice)
Love Wedge 2 (1994)
as Riki (voice)
Kamen Rider Kiva & Den-O: DenLiner, Into Space! (2009)
as Momotaros (voice)
Call Me Tonight (1986)
as Hayata (voice)
Moonlight Pierce (1991)
as Hiroshi Takama (voice)
Hisashi Eguchi's Kotobuki Goro Show (1991)
as Piston Akagi (voice)
Love Wedge 1 (1992)
as Riki (voice)
Kamen Rider Den-O: Final Stage (2007)
as Momotaros
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)
Baby Felix & Friends (2000)
as Felix The Cat
OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~ (2011)
as Momotaros (voice)
Cinderella Express (1989)
as Yuji Shimano
10th Anniversary Project: Masked Rider LIVE & SHOW (2009)
as Kamen Rider Den-O Sword Form (voice)
Dorami-chan: A Blue Straw Hat (1994)
as Crow (voice)
Trusty Ginjiro (1991)
as Hideki Mitsui (voice)
The End of the Century Darling (1996)
as Todorokki Kouhei (voice)
Imagin Anime: Momotaros Forever!/Imajin Terminal Station (2008)
as Momotaros (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
Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!- (2017)
as Momotaros
Milky Passion: Dougenzaka - The Castle of Love (1990)
as Ootsuki (voice)
TOKYO CITY Melhen 2 (1990)
Actor
Yawara! Atlanta Special (1996)
Actor
Heart-Coloured Killer Ticket (1990)
as Chuta Misora (voice)
Momotaros' Summer Vacation (2007)
as Momotaros (voice)
Saiyuki Interactive (2002)
Actor
Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!- (2009)
as Momotaros (voice)
Momotaros' King of the Crimson Castle (2008)
as Momotaros (voice)
Paranoia Agent: Part 1 (2004)
as まにわ みつひろ
Super Space Sheriff Gavan Infinity: Jo-Chaku Course (2026)
as Gavarion Trigger System Voice (voice)
Chimera: Angel of Death (1997)
as Ron