Koji Seki - Actor Profile

Koji Seki

Acting
Updated: Apr 17, 2026
4Total Films
7.9 Highest Rated
Born: Nov 25, 1982
Birth Place: Saitama, Japan

About Koji Seki

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.

Koji Seki Movies & Career Overview

The filmography of Koji Seki reflects exceptional commercial consistency. Across 4 major appearances, the actor has built a reputation through performances in multiple genres and storytelling styles.

Dominant Genre

A large portion of Koji Seki's work falls within the Animation genre, where audiences tend to respond most strongly to their on-screen presence.

Success Ratio

Approximately 100% of Koji Seki's films maintain ratings above 6.5, indicating a consistent level of audience approval.

One of the most highly rated entries in their career remains Umamusume: Pretty Derby - Beginning of a New Era, which stands out as a key performance.

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Best Koji Seki Movies Ranked

Must-watch hits from Koji Seki's career based on audience ratings.

Full Filmography

Every movie Koji Seki has appeared in, with audience ratings and verdicts.

Koji Seki - Frequently Asked Questions

What is the best movie of Koji Seki?

According to audience ratings, the best movie starring Koji Seki is "Umamusume: Pretty Derby - Beginning of a New Era" with a rating of 7.9/10.

How many movies has Koji Seki acted in?

Koji Seki has been featured in at least 4 major films throughout their career.

What are some other popular movies by Koji Seki?

Other notable films include "HAIKYU!! The Dumpster Battle", "Sword Art Online the Movie – Progressive – Scherzo of Deep Night", and "DAN DA DAN: First Encounter".

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