Shota Aizawa, the underground hero Eraser Head, cuts a gaunt figure with his tall frame, perpetually disheveled shoulder-length black hair, and eyes heavy with exhaustion. His unkempt stubble and casual disregard for appearances shift only during formal events, where he trades scruff for sharp attire. His signature black combat gear includes a utility belt and a scarf concealing yellow goggles—tools complementing his Erasure Quirk, which nullifies others’ abilities. Years of battle leave visible marks: a scar beneath his right eye from the U.S.J. Incident, an eyepatch and prosthetic leg post-Shigaraki confrontation, and cropped hair in later years. At U.A. High, a younger Aizawa grappled with introversion and self-doubt over his Quirk until friendships with Hizashi Yamada (Present Mic) and Oboro Shirakumo (Loud Cloud) bolstered his confidence. Shirakumo’s death during a mission shattered this growth, steering Aizawa toward solitary underground hero work. This loss cemented his belief in merciless preparedness, later defining his teaching ethos. As an instructor, Aizawa employs harsh tactics—like expulsion threats—to simulate heroism’s brutal realities, though he covertly re-enrolls students. His stern exterior masks fierce protectiveness: shielding Tsuyu Asui during U.S.J.’s chaos, severing his own leg to preserve his Quirk mid-battle. He melds Erasure with a cloth-based capture weapon and precise martial arts, honed over years, to dismantle foes through strategy and Quirk cancellation. Key clashes—holding off the League of Villains, battling High-End Nomus—highlight his tactical brilliance. The *Vigilantes* spin-off unveils his past mentorship under Midnight, who nudged him toward teaching. Discovering Shirakumo’s corpse repurposed into Kurogiri, a League enforcer, reignites old wounds, spurring Aizawa to hunt the scientist behind this desecration. Evolving from an aloof teacher to a mentor valuing students as peers, he guides Hitoshi Shinso, seeing their shared reliance on wit over raw power. Guardianship of Eri and wry exchanges with Ms. Joke reveal layers of dry humor and loyalty. Personal quirks include a penchant for cats—evidenced by a school-day kitten rescue—and sparse living, his fatigue offset by naps in a yellow sleeping bag. Rare smiles flicker during student triumphs or clever ploys. Aizawa’s journey—from traumatized student to a guardian shaping resilient heroes—underscores a life dedicated to averting past tragedies, weaving loss into lessons of endurance and duty. His legacy lies in balancing relentless pragmatism with unspoken care, forging protectors ready to face a perilous world.