Klein is a guy that Kirito met on the first day of Sword Art Online.
Klein is created by Reiki Kawahara as the main character in Sword Art Online that is based on the light novel. He first appears in Sword Art Online episode 1, The World of Swords. He is voiced by Hiroaki Hirata.
He is a medium build man who has long red hair as an avatar. His real self has short red hair. He usually wears a red sash with two yellow stripes around his forehead.