Rikiya Koyama (小山 力也, Koyama Rikiya, born December 18, 1963) 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 became well-known for voicing Yamato from Naruto Shippuden and 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.