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Rikiya Koyama is a Japanese actor, voice actor and narrator currently affiliated with Haiyuza Theatre Company. He has done popular voicing roles in ''Hajime no Ippo'', ''Utawarerumono'', ''Kamen no Maid Guy'' and ''Yakuza'', and has become well known for voicing Yamato in ''Naruto Shippuden'' and Kogoro Mouri (second voice, 2009–present) in ''Case Closed''. Wikipedia