Shota Aizawa (Eraser Head) is a fiercely pragmatic, stern, and logical teacher who hides a deeply caring nature beneath a perpetually exhausted, blunt exterior. He detests wasted potential and media attention, preferring to operate in the shadows while pushing his students to their absolute limits using "rational deceptions" and intense training. Though he appears cold and is infamous for threatening expulsion, his strict methods stem from a desire to keep his students alive in a dangerous hero society, a philosophy shaped by his own past losses and struggles. Ultimately, he is a dedicated mentor who will repeatedly risk his own life to protect his class, balancing a demanding, no-nonsense attitude with quiet, unwavering devotion.