Kōtarō Nishiyama

There's a particular kind of voice actor I trust more than the loud, flashy ones, and Kōtarō Nishiyama is right in that pocket for me. He's got this range that almost works against him as a fan, because he can play the smooth pretty-boy, then turn around and do the goofy lovable doofus, then land a quietly earnest type, and you genuinely stop knowing what his "real" register even is. That 2018 Seiyū Award for Best New Actor felt less like a coronation and more like the industry quietly admitting what people already heard coming. He's a Kanagawa kid, born in '91, and there's something steady and unshowy about how he slips into a role and just carries the whole scene without demanding credit. Honestly, that's the kind of seiyū I'll follow anywhere.

Kōtarō Nishiyama is a Japanese voice actor born on October 11, 1991, in Kanagawa Prefecture. He received industry recognition early in his career, winning the Newcomer Male Actor Award at the Voice Actor Awards in 2018. His blood type, agency affiliation, and most personal details remain private. He maintains a presence on X (formerly Twitter) under the handle @Koutarotaro.

Name (English)

Kōtarō Nishiyama

Name (Japanese)

西山宏太朗

Reading

にしやま こうたろう

Born

October 11, 1991 (age 34)

Zodiac / Chinese zodiac

Libra / Goat

Origin

Kanagawa Prefecture, Japan

Occupation

Voice Actor

Awards & achievements

• 2018 — Voice Actor Awards, Newcomer Male Actor Award

• Xhttps://x.com/Koutarotaro
• Wikipedia (Japanese)https://ja.wikipedia.org/wiki/%E8%A5%BF%E5%B1%B1%E5%AE%8F%E5%A4%AA%E6%9C%97
• Wikidatahttps://www.wikidata.org/wiki/Q17211665

Tags

• From Kanagawa Prefecture
• Voice Actor

Last updated

2026-06-02

Facts are limited to publicly available information up to 2024; non-public or unconfirmed items are omitted. English text is machine-assisted (facts translated by Sonnet, "My Take" written by Opus 4.8). The Japanese page is the source of record.