Japanese actor and voice actor. He 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 in Naruto Shippuden, Kogoro Mouri in Case Closed. He is also known for voicing rather tall or massive inhuman villains like Coyote Starrk in Bleach, Fukuro in Fairy Tail and Deep Sea King in One Punch Man. He is also the official dub-over artist of George Clooney and Kiefer Sutherland, also for Ma Dong-seok.
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