Portrait of Koji Seki

Koji Seki

Bio: Koji Seki (関 幸司, Seki Kōji, born November 25, 1982) is a Japanese voice actor from Saitama Prefecture who is affiliated with Raccoon Dog. He graduated from Pro-Fit Voice Actor Training School and joined the agency Pro-Fit
Born: Thu, Nov 25 1982
Birthplace: Saitama, Japan
Koji Seki is 41 years old
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Acting Roles
Crew Roles

Movies (Acting Roles)

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Poster of Sword Art Online the Movie – Progressive – Scherzo of Deep Night
Sword Art Online the Movie – Progressive – Scherzo of Deep Night
Koji Seki was
39 in Sword Art Online the Movie – Progressive – Scherzo of Deep Night
as 'Naijan (voice)'.
Sat, Oct 22 2022
Poster of Princess Onmitsu
Princess Onmitsu
Koji Seki was
25 in Princess Onmitsu
as 'Evil Ninja (voice)'.
Mon, Dec 10 2007

TV Shows (Acting Roles)

Sorted by Release Date
Ages in TV shows are based off the first air date and may not be accurate. View individual episode details for accurate ages
Poster of I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
Koji Seki was
40+ in I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
as '(voice)'.
First Air Date
Fri, Apr 07 2023
Poster of The Aristocrat's Otherworldly Adventure
The Aristocrat's Otherworldly Adventure
Koji Seki was
40+ in The Aristocrat's Otherworldly Adventure
as 'Sebas (voice)'.
First Air Date
Mon, Apr 03 2023
Poster of NieR:Automata Ver1.1a
NieR:Automata Ver1.1a
Koji Seki was
40+ in NieR:Automata Ver1.1a
as 'Kingdom Citizen (voice), Machine Creature (voice)'.
First Air Date
Sun, Jan 08 2023
Poster of BLUE LOCK
BLUE LOCK
Koji Seki was
39+ in BLUE LOCK
as 'Reporter B (voice)'.
First Air Date
Sun, Oct 09 2022
Poster of Remake Our Life!
Remake Our Life!
Koji Seki was
38+ in Remake Our Life!
as '(voice)'.
First Air Date
Sat, Jul 03 2021
Poster of I've Been Killing Slimes for 300 Years and Maxed Out My Level
I've Been Killing Slimes for 300 Years and Maxed Out My Level
Koji Seki was
38+ in I've Been Killing Slimes for 300 Years and Maxed Out My Level
as 'Store Customer E (voice)'.
First Air Date
Sat, Apr 10 2021
Poster of Super Cub
Super Cub
Koji Seki was
38+ in Super Cub
as 'Clerk (voice)'.
First Air Date
Wed, Apr 07 2021
Poster of Yashahime: Princess Half-Demon
Yashahime: Princess Half-Demon
Koji Seki was
37+ in Yashahime: Princess Half-Demon
as 'Thug (voice), Old man (voice), Peddler (voice), Official (voice), Guard (voice), Chimimoryo (voice), Villager (voice), Bird of Paradise (voice), Peasant (voice), Subordinate (voice), Townsfolk (voice), Vassal (voice), Fisherman (voice), Demon (voice), Palanquin Carrier (voice), Rock Demon (voice), Green ogre (voice), Staff member (voice), Yokai (voice), Raccoon dog in Mamiana Island (voice)'.
First Air Date
Sat, Oct 03 2020
Poster of Jujutsu Kaisen
Jujutsu Kaisen
Koji Seki was
37+ in Jujutsu Kaisen
as 'Fumi's Father (voice)'.
First Air Date
Sat, Oct 03 2020
Poster of The Quintessential Quintuplets
The Quintessential Quintuplets
Koji Seki was
36+ in The Quintessential Quintuplets
as 'Teacher (voice), Homeroom Teacher (voice)'.
First Air Date
Fri, Jan 11 2019
Poster of March Comes in Like a Lion
March Comes in Like a Lion
Koji Seki was
33+ in March Comes in Like a Lion
as 'Authorized Person 3 (voice)'.
First Air Date
Sat, Oct 08 2016
Poster of Haikyu!!
Haikyu!!
Koji Seki was
31+ in Haikyu!!
as 'Kai Akakura (voice)'.
First Air Date
Sun, Apr 06 2014
Poster of Sword Art Online
Sword Art Online
Koji Seki was
29+ in Sword Art Online
as 'Technical Staff (voice), Goblin (voice)'.
First Air Date
Sun, Jul 08 2012
Poster of Daily Lives of High School Boys
Daily Lives of High School Boys
Koji Seki was
29+ in Daily Lives of High School Boys
as 'Basketball Guy (voice), Habara's Older Brother (voice)'.
First Air Date
Tue, Jan 10 2012