Koji Seki

Known for: Acting

Born: 1982-11-25 (age 43)

From: 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.

Filmography (37)

TV★ 8.1
Akane-banashi
2026
as Chusuke Chuotei (voice)
TV★ 8.4
You and I Are Polar Opposites
2026
as Convenience Store Manager (voice)
TV★ 7.0
Inexpressive Kashiwada and Expressive Oota
2025
as Mathematics Teacher (voice)
TV★ 7.3
Solo Camping for Two
2025
as Izakaya Manager (voice)
TV★ 6.3
Turkey! Time to Strike
2025
as Samurai (voice)
TV★ 7.3
Welcome to the Outcast's Restaurant!
2025
as Merchant (voice)
TV★ 6.8
Summer Pockets
2025
as (voice)
TV★ 7.8
Catch Me at the Ballpark!
2025
as Kaiser (voice)
TV★ 7.7
Puniru Is a Kawaii Slime
2024
as Academic Researchers (voice)
TV★ 8.0
Orb: On the Movements of the Earth
2024
as Knight (voice)
TV★ 8.5
Dan Da Dan
2024
as TV Station Producer (voice)
TV★ 6.6
Let This Grieving Soul Retire
2024
as Greg Zangief (voice)
MOVIE★ 7.6
DAN DA DAN: First Encounter
2024
as TV Station Producer (voice)
MOVIE★ 8.6
Umamusume: Pretty Derby - Beginning of a New Era
2024
as (voice)
TV★ 7.5
Mission: Yozakura Family
2024
as Detective (voice)
MOVIE★ 7.8
HAIKYU!! The Dumpster Battle
2024
as Patient (voice)
TV★ 7.1
Tearmoon Empire
2023
as Priest (voice)
TV★ 8.8
Frieren: Beyond Journey's End
2023
as Villager (voice)
TV★ 8.2
I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
2023
as (voice)
TV★ 7.1
The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far
2023
as Sebas (voice)
TV★ 8.1
NieR:Automata Ver1.1a
2023
as Kingdom Citizen (voice)
MOVIE★ 7.7
Sword Art Online the Movie – Progressive – Scherzo of Deep Night
2022
as Naijan (voice)
TV★ 8.3
BLUE LOCK
2022
as Reporter B (voice)
TV★ 8.5
SPY x FAMILY
2022
as Rahden (voice)
TV★ 7.1
Star Wars: Visions
2021
as Eno's Father / Resistance Member (voice)
TV★ 7.2
Remake Our Life!
2021
as (voice)
TV★ 7.9
I've Been Killing Slimes for 300 Years and Maxed Out My Level
2021
as Store Customer E (voice)
TV★ 7.3
Super Cub
2021
as Clerk (voice)
TV★ 8.3
Yashahime: Princess Half-Demon
2020
as Thug (voice)
TV★ 8.6
JUJUTSU KAISEN
2020
as Fumi's Father (voice)
TV★ 8.2
Tower of God
2020
as (voice)
TV★ 7.3
ID: INVADED
2020
as Staff (voice)
TV★ 8.4
The Quintessential Quintuplets
2019
as Teacher (voice)
TV★ 8.0
March Comes In Like a Lion
2016
as Authorized Person 3 (voice)
TV★ 8.6
Haikyu!!
2014
as Kai Akakura (voice)
TV★ 8.2
Sword Art Online
2012
as Technical Staff (voice)
TV★ 8.0
Daily Lives of High School Boys
2012
as Basketball Guy (voice)