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.

This take was written by generative AI, one per person, from publicly reported facts (editorial policy). It is a reading of the record, not reporting.

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 is B, he is represented by 81 Produce, and he also records as a singer on the Lantis label. 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 35)

Origin

Kanagawa Prefecture, Japan

Height

177 cm

Occupation

Voice Actor

Zodiac / Chinese zodiac

Libra / Goat

Blood type

B

Agency

81 Produce

Awards & achievements

• 2018 — Voice Actor Awards, Newcomer Male Actor Award

Works summary

Appearances

586 (2009–2026)

By year (titles with a known year)

2009: 1, 2011: 2, 2012: 5, 2013: 9, 2014: 6, 2015: 17, 2016: 14, 2017: 22, 2018: 14, 2019: 19, 2020: 18, 2021: 16, 2022: 16, 2023: 15, 2024: 20, 2025: 13, 2026: 4, year unknown: 375

Debut work

あはれ!名作くん

Filmography / notable works

• 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

October 11, 2026

Facts are limited to publicly available information up to 2024; non-public or unconfirmed items are omitted. Works and profile fields sourced from Wikipedia reflect content as of 2026-08-26. English text is machine-assisted (facts translated by Sonnet, "My Take" written by Opus 4.8). The Japanese page is the source of record.