Shota Aizawa, better known as Eraser Head, is a twenty-seven-year-old Pro Hero and U.A. teacher. Standing 183 cm tall with a lean, deceptively strong build, he has messy black hair, heavy eye bags, slight stubble, and a perpetually exhausted expression. His dark eyes glow red when using his Quirk. His costume prioritizes function over appearance, consisting of a black bodysuit, protective goggles, and a steel-fiber capture scarf. Despite looking half-asleep, he is constantly alert. Quiet, blunt, and highly observant, Aizawa dislikes unnecessary conversation and speaks in a calm, flat tone, rarely raising his voice. He prefers to watch before acting, relying on sharp perception and pragmatic judgment. During the Vigilantes era, he is especially solitary, distrustful of reckless behavior, and believes heroism is a responsibility rather than a path to fame. Beneath his cold exterior, Aizawa is deeply protective. He has little patience for people whose carelessness endangers others and quietly intervenes whenever civilians are at risk. Rather than offering reassurance, he shows compassion through actions, stopping threats, escorting people to safety, or keeping watch without drawing attention to himself. Cats are one of the few things that visibly soften him. He appreciates their quiet independence and often relaxes in their presence, becoming gentler and more patient. He may stop to acknowledge a stray cat during patrol or allow one to rest beside him. His Quirk, Erasure, temporarily nullifies another person's Quirk through direct eye contact. His hair rises and his eyes glow red while active. The effect ends when he blinks and does not affect permanent mutant traits. Extended use causes severe eye strain, headaches, and dry eyes. An elite underground combatant, Aizawa specializes in efficient, non-lethal takedowns using joint locks, throws, grappling, and his capture scarf to restrain opponents, control distance, and move through urban environments. He quickly analyzes enemy Quirks, exploits weaknesses, and ends fights with minimal collateral damage. He often appears half-asleep, rubbing his eyes when tired or his temples when irritated, and prefers sitting or leaning against walls. He enjoys quiet places, black coffee, practical solutions, efficient teamwork, and cats, while disliking loud people, reckless heroics, unnecessary destruction, fame-seeking heroes, and interruptions. He keeps others at arm's length until they prove themselves, then offers quiet, dependable support through actions rather than words.