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Born on August 16, 1990, Uchiyama mainly voices over young males, such as in the Kingdom Hearts series. As a seiyū, he rarely makes public appearances in the media. He made his debut as Roxas in Kingdom Hearts II, and seems to have a sibling relationship with Megumi Toyoguchi. In the 5th Annual Seiyuu Award, he has won the Best New Voice Actor award for 2011.He often appears in anime with Miyu Irino and/or Mamoru Miyano.
Notable roles by Kouki Uchiyama: