Koji Seki

Koji Seki

Age: 42 years old
Born: November 25, 1982 in Saitama, Japan
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.
Orb: On the Movements of the Earth

Orb: On the Movements of the Earth

TV | 2025
Knight (voice)
One Episode
Catch Me at the Ballpark!

Catch Me at the Ballpark!

TV | 2025
Kaiser (voice)
One Episode
Summer Pockets

Summer Pockets

TV | 2025
(voice)
3 Episodes
Welcome to the Outcast's Restaurant!

Welcome to the Outcast's Restaurant!

TV | 2025
Merchant (voice)
One Episode
Puniru Is a Kawaii Slime

Puniru Is a Kawaii Slime

TV | 2025
Academic Researcher (voice)
One Episode
Turkey! Time to Strike

Turkey! Time to Strike

TV | 2025
Samurai (voice)
One Episode
Solo Camping for Two

Solo Camping for Two

TV | 2025
Izakaya Manager (voice)
One Episode
Star Wars: Visions

Star Wars: Visions

TV | 2025
One Episode
DAN DA DAN: First Encounter

DAN DA DAN: First Encounter

Movie | 2024
TV Station Producer (voice)
HAIKYU!! The Dumpster Battle

HAIKYU!! The Dumpster Battle

Movie | 2024
Patient (voice)
Umamusume: Pretty Derby – Beginning of a New Era

Umamusume: Pretty Derby – Beginning of a New Era

Movie | 2024
(voice)
Dan Da Dan

Dan Da Dan

TV | 2024
TV Station Producer (voice)
One Episode
Dan Da Dan

Dan Da Dan

TV | 2024
Male Client (voice)
One Episode
Tower of God

Tower of God

TV | 2024
(voice)
One Episode
Dan Da Dan

Dan Da Dan

TV | 2024
Male Teacher (voice)
One Episode
Mission: Yozakura Family

Mission: Yozakura Family

TV | 2024
Detective (voice)
One Episode
Mission: Yozakura Family

Mission: Yozakura Family

TV | 2024
(voice)
One Episode
Mission: Yozakura Family

Mission: Yozakura Family

TV | 2024
Battalion member (voice)
One Episode
Let This Grieving Soul Retire

Let This Grieving Soul Retire

TV | 2024
Greg Zangief (voice)
14 Episodes
Puniru Is a Kawaii Slime

Puniru Is a Kawaii Slime

TV | 2024
Academic Researchers (voice)
2 Episodes
NieR:Automata Ver1.1a

NieR:Automata Ver1.1a

TV | 2023
Kingdom Citizen (voice)
One Episode
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

TV | 2023
(voice)
7 Episodes
The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far

The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far

TV | 2023
Sebas (voice)
One Episode
JUJUTSU KAISEN

JUJUTSU KAISEN

TV | 2023
Fumi's Father (voice)
One Episode
NieR:Automata Ver1.1a

NieR:Automata Ver1.1a

TV | 2023
Machine Creature (voice)
One Episode
Tearmoon Empire

Tearmoon Empire

TV | 2023
Priest (voice)
2 Episodes
Tearmoon Empire

Tearmoon Empire

TV | 2023
Man (voice)
One Episode
Tearmoon Empire

Tearmoon Empire

TV | 2023
Soldier (voice)
One Episode
Tearmoon Empire

Tearmoon Empire

TV | 2023
Merchant (voice)
One Episode
Sword Art Online the Movie – Progressive – Scherzo of Deep Night

Sword Art Online the Movie – Progressive – Scherzo of Deep Night

Movie | 2022
Naijan (voice)
BLUE LOCK

BLUE LOCK

TV | 2022
Reporter B (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2022
Staff member (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2022
Yokai (voice)
2 Episodes
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2022
Raccoon dog in Mamiana Island (voice)
One Episode
Super Cub

Super Cub

TV | 2021
Clerk (voice)
2 Episodes
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

TV | 2021
Store Customer E (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Chimimoryo (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Bird of Paradise (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Peasant (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Townsfolk (voice)
2 Episodes
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Subordinate (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Demon (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Fisherman (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Rock Demon (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Palanquin Carrier (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Green ogre (voice)
One Episode
Remake Our Life!

Remake Our Life!

TV | 2021
(voice)
One Episode
Sword Art Online

Sword Art Online

TV | 2020
Technical Staff (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Thug (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Old man (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Peddler (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Official (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Guard (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Villager (voice)
4 Episodes
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Vassal (voice)
3 Episodes
Haikyu!!

Haikyu!!

TV | 2020
Kai Akakura (voice)
4 Episodes
ID: INVADED

ID: INVADED

TV | 2020
Staff (voice)
One Episode
Sword Art Online

Sword Art Online

TV | 2019
Goblin (voice)
One Episode
The Quintessential Quintuplets

The Quintessential Quintuplets

TV | 2019
Teacher (voice)
One Episode
The Quintessential Quintuplets

The Quintessential Quintuplets

TV | 2019
Homeroom Teacher (voice)
2 Episodes
March Comes In Like a Lion

March Comes In Like a Lion

TV | 2018
Authorized Person 3 (voice)
One Episode
Daily Lives of High School Boys

Daily Lives of High School Boys

TV | 2012
Basketball Guy (voice)
One Episode
Daily Lives of High School Boys

Daily Lives of High School Boys

TV | 2012
Boy B (voice)
One Episode
Orb: On the Movements of the Earth

Orb: On the Movements of the Earth

TV | 2025
Knight (voice)
One Episode
Catch Me at the Ballpark!

Catch Me at the Ballpark!

TV | 2025
Kaiser (voice)
One Episode
Summer Pockets

Summer Pockets

TV | 2025
(voice)
3 Episodes
Welcome to the Outcast's Restaurant!

Welcome to the Outcast's Restaurant!

TV | 2025
Merchant (voice)
One Episode
Puniru Is a Kawaii Slime

Puniru Is a Kawaii Slime

TV | 2025
Academic Researcher (voice)
One Episode
Turkey! Time to Strike

Turkey! Time to Strike

TV | 2025
Samurai (voice)
One Episode
Solo Camping for Two

Solo Camping for Two

TV | 2025
Izakaya Manager (voice)
One Episode
Star Wars: Visions

Star Wars: Visions

TV | 2025
One Episode
Dan Da Dan

Dan Da Dan

TV | 2024
TV Station Producer (voice)
One Episode
Dan Da Dan

Dan Da Dan

TV | 2024
Male Client (voice)
One Episode
Tower of God

Tower of God

TV | 2024
(voice)
One Episode
Dan Da Dan

Dan Da Dan

TV | 2024
Male Teacher (voice)
One Episode
Mission: Yozakura Family

Mission: Yozakura Family

TV | 2024
Detective (voice)
One Episode
Mission: Yozakura Family

Mission: Yozakura Family

TV | 2024
(voice)
One Episode
Mission: Yozakura Family

Mission: Yozakura Family

TV | 2024
Battalion member (voice)
One Episode
Let This Grieving Soul Retire

Let This Grieving Soul Retire

TV | 2024
Greg Zangief (voice)
14 Episodes
Puniru Is a Kawaii Slime

Puniru Is a Kawaii Slime

TV | 2024
Academic Researchers (voice)
2 Episodes
NieR:Automata Ver1.1a

NieR:Automata Ver1.1a

TV | 2023
Kingdom Citizen (voice)
One Episode
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

TV | 2023
(voice)
7 Episodes
The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far

The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far

TV | 2023
Sebas (voice)
One Episode
JUJUTSU KAISEN

JUJUTSU KAISEN

TV | 2023
Fumi's Father (voice)
One Episode
NieR:Automata Ver1.1a

NieR:Automata Ver1.1a

TV | 2023
Machine Creature (voice)
One Episode
Tearmoon Empire

Tearmoon Empire

TV | 2023
Priest (voice)
2 Episodes
Tearmoon Empire

Tearmoon Empire

TV | 2023
Man (voice)
One Episode
Tearmoon Empire

Tearmoon Empire

TV | 2023
Soldier (voice)
One Episode
Tearmoon Empire

Tearmoon Empire

TV | 2023
Merchant (voice)
One Episode
BLUE LOCK

BLUE LOCK

TV | 2022
Reporter B (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2022
Staff member (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2022
Yokai (voice)
2 Episodes
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2022
Raccoon dog in Mamiana Island (voice)
One Episode
Super Cub

Super Cub

TV | 2021
Clerk (voice)
2 Episodes
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

TV | 2021
Store Customer E (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Chimimoryo (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Bird of Paradise (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Peasant (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Townsfolk (voice)
2 Episodes
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Subordinate (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Demon (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Fisherman (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Rock Demon (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Palanquin Carrier (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2021
Green ogre (voice)
One Episode
Remake Our Life!

Remake Our Life!

TV | 2021
(voice)
One Episode
Sword Art Online

Sword Art Online

TV | 2020
Technical Staff (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Thug (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Old man (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Peddler (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Official (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Guard (voice)
One Episode
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Villager (voice)
4 Episodes
Yashahime: Princess Half-Demon

Yashahime: Princess Half-Demon

TV | 2020
Vassal (voice)
3 Episodes
Haikyu!!

Haikyu!!

TV | 2020
Kai Akakura (voice)
4 Episodes
ID: INVADED

ID: INVADED

TV | 2020
Staff (voice)
One Episode
Sword Art Online

Sword Art Online

TV | 2019
Goblin (voice)
One Episode
The Quintessential Quintuplets

The Quintessential Quintuplets

TV | 2019
Teacher (voice)
One Episode
The Quintessential Quintuplets

The Quintessential Quintuplets

TV | 2019
Homeroom Teacher (voice)
2 Episodes
March Comes In Like a Lion

March Comes In Like a Lion

TV | 2018
Authorized Person 3 (voice)
One Episode
Daily Lives of High School Boys

Daily Lives of High School Boys

TV | 2012
Basketball Guy (voice)
One Episode
Daily Lives of High School Boys

Daily Lives of High School Boys

TV | 2012
Boy B (voice)
One Episode