Odin is a sweet family boy who is obedient and smart. When he was born he lost his right eye in an injury from his mother's claws. It was an accident though, they didn't mean it... They were just in such pain that they couldn't handle it and lashed out.  Odin never knew his biological mother or father. He was given to Niflheim by Xander so the kid could grow up with a proper family instead of living a life as an orphan dragon.