Koji Seki — Marquee

Koji Seki

Acting · b. 1982 · 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.

Known for

JUJUTSU KAISEN

8.6

JUJUTSU KAISEN

2020 · Series · Fumi's Father (voice)

SPY x FAMILY

8.5

SPY x FAMILY

2022 · Series · Rahden (voice)

Let This Grieving Soul Retire

6.6

Let This Grieving Soul Retire

2024 · Series · Greg Zangief (voice)

Sword Art Online

8.2

Sword Art Online

2012 · Series · Technical Staff (voice) / Goblin (voice)

Haikyu!!

8.6

Haikyu!!

2014 · Series · Kai Akakura (voice)

Frieren: Beyond Journey's End

8.8

Frieren: Beyond Journey's End

2023 · Series · Villager (voice)

Dan Da Dan

8.5

Dan Da Dan

2024 · Series · TV Station Producer (voice) / Male Client (voice) / Male Teacher (voice)

The Quintessential Quintuplets

8.4

The Quintessential Quintuplets

2019 · Series · Teacher (voice) / Homeroom Teacher (voice)

BLUE LOCK

8.3

BLUE LOCK

2022 · Series · Reporter B (voice)

Tower of God

8.2

Tower of God

2020 · Series · (voice)

Star Wars: Visions

7.1

Star Wars: Visions

2021 · Series · Eno's Father / Resistance Member (voice)

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

8.2

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

2023 · Series · (voice)

All acting credits37

Akane-banashi

7.9

Akane-banashi

2026 · Series · Chusuke Chuotei (voice)

You and I Are Polar Opposites

8.4

You and I Are Polar Opposites

2026 · Series · Convenience Store Manager (voice)

Summer Pockets

6.8

Summer Pockets

2025 · Series · (voice)

Solo Camping for Two

7.5

Solo Camping for Two

2025 · Series · Izakaya Manager (voice)

Catch Me at the Ballpark!

7.8

Catch Me at the Ballpark!

2025 · Series · Kaiser (voice)

Inexpressive Kashiwada and Expressive Oota

7.0

Inexpressive Kashiwada and Expressive Oota

2025 · Series · Mathematics Teacher (voice)

Welcome to the Outcast's Restaurant!

7.3

Welcome to the Outcast's Restaurant!

2025 · Series · Merchant (voice)

Turkey! Time to Strike

6.3

Turkey! Time to Strike

2025 · Series · Samurai (voice)

Dan Da Dan

8.5

Dan Da Dan

2024 · Series · TV Station Producer (voice) / Male Client (voice) / Male Teacher (voice)

Puniru Is a Kawaii Slime

7.7

Puniru Is a Kawaii Slime

2024 · Series · Academic Researchers (voice) / Academic Researcher (voice)

Mission: Yozakura Family

7.5

Mission: Yozakura Family

2024 · Series · Detective (voice) / Battalion member (voice)

Orb: On the Movements of the Earth

8.0

Orb: On the Movements of the Earth

2024 · Series · Knight (voice)

Let This Grieving Soul Retire

6.6

Let This Grieving Soul Retire

2024 · Series · Greg Zangief (voice)

HAIKYU!! The Dumpster Battle

7.8

HAIKYU!! The Dumpster Battle

2024 · Patient (voice)

Umamusume: Pretty Derby - Beginning of a New Era

8.6

Umamusume: Pretty Derby - Beginning of a New Era

2024 · (voice)

DAN DA DAN: First Encounter

7.6

DAN DA DAN: First Encounter

2024 · TV Station Producer (voice)

Frieren: Beyond Journey's End

8.8

Frieren: Beyond Journey's End

2023 · Series · Villager (voice)

NieR:Automata Ver1.1a

8.1

NieR:Automata Ver1.1a

2023 · Series · Kingdom Citizen (voice) / Machine Creature (voice)