He is a Nymvess, who is blind and deaf but he doesn't let that stop him.  He is another one of Luna's best friends and eventually a love interest for Ash.  He can read minds and he uses that to help him see and hear what is going on, so he is even more aware of everything going on than everyone else.  He is quiet and a genius, he doesn't speak out too much but when he does he makes sure he is heard.  He is one of the main characters.