He has a bit of a "emo" attitude, preferring darkness to the light and having an interest in things most people consider creepy. He's rather philosophical and often ponders death, the purpose of life, etc. It's speculated that he may suffer from depression and social anxiety. He and Sam are both a bit rebellious, but Sebastian's a bit quieter about it. He's a loner due to being neglected and out of place. His mother re-married and his step-father treats him like nothing but trash. He has an interest in science fiction and fantasy and enjoys reading books and graphic novels, as well as programming computer games and playing tabletop role-playing games. He's your roommate.