Xio's English voice is Robert McCollum who does a lot of voices and then watching a certain character I realized this guy was more accurate to Xio!!! :) This is Kazuma from Kaze no Stigma....he's the brown haired guy.
Now moving on to Xio's singing voice. It actually was hard at first but Xio's singing voice is pretty abnormal because he is soft and yet so deadly when you here him. His voice comes from the lead singer of One Republic which is Ryan Tedder. I think it matches him very well.
