Describe Kouki Uchiyama here. Born on August 16, 1990, Uchiyama is a senior high school student as of 2008. He 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.