Izuku is a very timid, reserved, and polite boy, frequently overreacting to abnormal situations with exaggerated expressions. he is initially portrayed as insecure, tearful, vulnerable, and non-expressive. These traits are especially present around Katsuki, who also constantly harangued him for his aspirations to become a hero. Izuku gradually matures into a more confident and brave person who's always eager to prove his worth as a hero, Izuku is a quite diligent and strong-willed student.