He also starred in 2010 live-action film Wonderful World with fellow voice actors, Mamoru Miyano, Tomokazu Sugita, Tomokazu Seki, Yuka Hirata, Showtaro Morikubo and Daisuke Namikawa.

He also does an attractive dubbing for the voice of the pediatrician, Dr. Doug Ross (George Clooney) in the American TV drama ER, which has been broadcast in Japan since 1996 by NHK (Japan Broadcasting Corporation). This dubbing made him leap to fame in Japan. Since then, he has dubbed all the roles played by George Clooney in films after The Peacemaker and has also played leading characters in many major plays.

He graduated from Ritsumeikan University, where he read law, in 1986, and entered Toho Gakuen College and majored in drama. After graduation, he joined the Haiyuza Theatre Company in 1988. His first production with the company was The Idiot, in which he played the role of a servant. He came to the attention of the public when he was selected at an audition to play the role of Sebastian in Twelfth Night, directed by Michael Pennington. Since then, he has appeared in many plays, including The Merchant of Venice, staged October and November 2005. He played the role of Antonio. The play was performed in the UK, the Netherlands, Romania, and Japan and received a favorable reception. He played in Japanese TV dramas which dealt with social problems, such as The School Will Change When the Headmaster Changes and Unjust Accusation.

Rikiya Koyama (小山 力也 , Koyama Rikiya, born December 18, 1963 in Kyoto) is a Japanese actor and voice actor who is a member of Haiyuza Theatre Company. He has done popular voicing roles in Hajime no Ippo, Utawarerumono and Kamen no Maid Guy. He is also known by the nicknames “Rikki” and “Riki-chan”. Koyama become well known for voicing Yamato from Naruto Shippuden, Kogoro Mouri from Case Closed. He’s also known for voicing rather tall or massive inhuman villains like Coyote Starrk from Bleach, Fukuro from Fairy Tail and Deep Sea King from One Punch Man.