In 2020, Nishiyama made his debut as singer from Lantis with mini album CITY. Nishiyama shared the award with Taku Yashiro and Shun Horie. In 2018, he won the Best New Actor Award at the 12th Seiyuu Awards. In 2017, he published a photo essay book Tarorizumu. In 2016, Nishiyama released his first personal book Nishiyama-san Chi no Koutaro-kun. As part of Ooimachi Cream Soda, Nishiyama also acts in various stage plays. In 2015, he launched the entertainment group 'Ooimachi Cream Soda' along with Reona Irie and Yuu Taniguchi. In May 2011, he joined the company 81 Produce. In 2009, he participated in the 3rd 81 Audition and won a special award, after which he entered 81 Produce's training school.

In 2009, while in high school, he participated in NHK's nationwide high school broadcast competition.

During high school, he participated in the Creative Course (which included voice actor and broadcast major) of his school. Nishiyama wanted to work using his voice since his 6th year of elementary school in junior high school, he was suggested by a friend to become a voice actor. In 2018, he won the Best New Actor Award at the 12th Seiyu Awards. His major roles are Atsushi Kinugawa in Cute High Earth Defense Club Love!, Sakutaro Kirara in Jewelpet: Magical Change, Kazunori Uesugi in Tantei Team KZ Jiken Note, Yoshiharu Hisomu in Kiznaiver and Ryūichi Kashima in School Babysitters. He is currently affiliated with 81 Produce. Koutaro Nishiyama ( 西山宏太朗, Nishiyama Kōtarō, born October 11, 1991) is a Japanese voice actor and singer from Kanagawa Prefecture, Japan.

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