Personal Info

Known For

Acting

Known Credits

Gender

Male

Birthday

1982-11-25 (42 years old)

Place of Birth

Saitama, Japan

Also Known As

Kouji Seki
関幸司
Kōji Seki

Koji Seki

Biography

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. On April 1, 2022, he transferred to Raccoon Dog.

Known For

8.6%

Jujutsu Kaisen

Oct 3, 2020

8.2%

Sword Art Online

Jul 8, 2012

8.2%

Sword Art Online

Jul 8, 2012

8.6%

Haikyu!!

Apr 6, 2014

8.5%

The Quintessential Quintuplets

Jan 11, 2019

8.5%

The Quintessential Quintuplets

Jan 11, 2019

8.7%

Dan Da Dan

Oct 4, 2024

8.7%

Dan Da Dan

Oct 4, 2024

8.7%

Dan Da Dan

Oct 4, 2024

8.3%

Tower of God

Apr 2, 2020

8.2%

BLUE LOCK

Oct 9, 2022

8.2%

I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too

Apr 7, 2023

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Acting

2024		Puniru Is a Kawaii Slime as Academic Researchers (voice)
2024		Orb: On the Movements of the Earth as Knight (voice)
2024		Dan Da Dan as TV Station Producer (voice)
2024		Dan Da Dan as Male Client (voice)
2024		Dan Da Dan as Male Teacher (voice)
2024		Let This Grieving Soul Retire as Greg Zangief (voice)
2024		DAN DA DAN: First Encounter as TV Station Producer (voice)
2024		Mission: Yozakura Family as Detective (voice)
2024		Mission: Yozakura Family as (voice)
2024		Mission: Yozakura Family as Battalion member (voice)

2023		I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too as (voice)
2023		The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far as Sebas (voice)
2023		NieR:Automata Ver1.1a as Kingdom Citizen (voice)
2023		NieR:Automata Ver1.1a as Machine Creature (voice)

2022		Sword Art Online the Movie – Progressive – Scherzo of Deep Night as Naijan (voice)
2022		BLUE LOCK as Reporter B (voice)

2021		Remake Our Life! as (voice)
2021		I've Been Killing Slimes for 300 Years and Maxed Out My Level as Store Customer E (voice)
2021		Super Cub as Clerk (voice)

2020		Jujutsu Kaisen as Fumi's Father (voice)
2020		Yashahime: Princess Half-Demon as Thug (voice)
2020		Yashahime: Princess Half-Demon as Old man (voice)
2020		Yashahime: Princess Half-Demon as Peddler (voice)
2020		Yashahime: Princess Half-Demon as Official (voice)
2020		Yashahime: Princess Half-Demon as Guard (voice)
2020		Yashahime: Princess Half-Demon as Villager (voice)
2020		Yashahime: Princess Half-Demon as Chimimoryo (voice)
2020		Yashahime: Princess Half-Demon as Bird of Paradise (voice)
2020		Yashahime: Princess Half-Demon as Peasant (voice)
2020		Yashahime: Princess Half-Demon as Townsfolk (voice)
2020		Yashahime: Princess Half-Demon as Subordinate (voice)
2020		Yashahime: Princess Half-Demon as Vassal (voice)
2020		Yashahime: Princess Half-Demon as Demon (voice)
2020		Yashahime: Princess Half-Demon as Fisherman (voice)
2020		Yashahime: Princess Half-Demon as Rock Demon (voice)
2020		Yashahime: Princess Half-Demon as Palanquin Carrier (voice)
2020		Yashahime: Princess Half-Demon as Green ogre (voice)
2020		Yashahime: Princess Half-Demon as Staff member (voice)
2020		Yashahime: Princess Half-Demon as Yokai (voice)
2020		Yashahime: Princess Half-Demon as Raccoon dog in Mamiana Island (voice)
2020		Tower of God as (voice)

2019		The Quintessential Quintuplets as Teacher (voice)
2019		The Quintessential Quintuplets as Homeroom Teacher (voice)

2016

March Comes In Like a Lion as Authorized Person 3 (voice)

2014

Haikyu!! as Kai Akakura (voice)

2012		Sword Art Online as Technical Staff (voice)
2012		Sword Art Online as Goblin (voice)
2012		Daily Lives of High School Boys as Basketball Guy (voice)
2012		Daily Lives of High School Boys as Boy B (voice)