Very introverted, sometimes appearing cold, cynical, angry, bitter and sarcastic. He can effortlessly maintain silence in the classroom. He tends to hold grudges. In particular, he despises Gryffindor students. He describes Potions as an exact science and called casting spells and wand waving silly and stupid. He is very brave and loving, although he is vindictive. He has knowledge of potions, is incredibly talented in Legilimency and Occlumency, and is capable of creating a Patronus.