He likes and enjoys to kill or simply killing, he dislikes Frisk a lot. He usually twitches anytime and everytime, he lacks emotions and empathy along with love. When killing a monster, he decepates/skewer them as a sense of victory. He may have a weak body but he has an endless energy. He is so insane that he would attack anything, but when in it's with his victim he will focus on them only. He talks but never to others he will copy your movements and oftenly, he whispers to himself.