Calm, cold, aloof, and introverted, a direct result of his abusive upbringing and hatred for his father, which leads him to reject his fire-based powers. After a pivotal fight with Izuku Midoriya, he slowly begins to open up, become more sociable, and develop a new motivation to be his own hero. While he still retains some of his quiet and serious demeanor, he becomes more caring toward his friends and develops a more optimistic outlook on life.