Rex is an elf paladin. A standard knight in shining armor. Hes the leader of the group, but lacks a lot of confidence. He puts on a brave face for his team, and is strong of will and might. He grits his teeth, and pulls everyone together. He makes light of the situation and is an optimist.  I imagine his voice to be deep, strong, but not overconfident or cocky. Hes just an good hearted man who's willing to be the leader if no one else steps up, and doesn't take everything so seriously.