Shota Aizawa, known as the pro hero Eraser Head, serves as homeroom teacher for Class 1-A at U.A. High School. He attended U.A. alongside Hizashi Yamada (Present Mic) and Oboro Shirakumo, forming a tight-knit trio called "the three dumbigos of Class A." During his second year, self-doubt about his Quirk's limitations nearly derailed his hero path until Oboro urged him toward combat support specialization. Oboro's death during their training left Aizawa increasingly solitary and fiercely committed to preventing similar student tragedies. This trauma resurged when he discovered Oboro's reanimated corpse as the Nomu Kurogiri, causing profound emotional turmoil. Aizawa presents with perpetually tired eyes, unkempt shoulder-length black hair, and frequent stubble. His standard attire includes a worn black jumpsuit, utility belt, boots, and a bandage-like capture weapon. He often carries a yellow sleeping bag for naps, compensating for chronic sleep deprivation from workaholic habits. After multiple battles, he bears a crescent scar under his right eye, later wears an eye-patch over that eye, and uses a prosthetic right leg—self-amputated during the Paranormal Liberation War to preserve his Quirk. He prioritizes logical efficiency, manifesting as bluntness or perceived insensitivity. His teaching employs high-pressure tactics like expulsion threats he terms "logical ruses." Despite his stern exterior, he deeply invests in students' growth and safety, adapting methods to psychological needs—such as feigning capture during Momo Yaoyorozu's exam to build her confidence. He demonstrates fierce protectiveness in crises, shielding students like Tsuyu Asui from lethal harm despite his own injuries. His Quirk, Erasure, nullifies others' Quirks through sustained eye contact, making his hair float and eyes glow red until blinking. Ineffective against mutant-types, it demands precise timing. He compensates with exceptional combat skills, mastering close-quarters binding cloth techniques over six years. His resilience includes fighting with shattered bones during the USJ incident and amputating his own leg mid-battle. In the "Make It! Do-or-Die Survival Training" OVA, Aizawa designs a disaster rescue exercise for Class 1-A's Provisional Hero License prep. He splits students into teams, tasking Team A with rescuing a dummy from a collapsing six-story mall in Ground Beta. The simulation features power outages, structural instability, fires, and flooding. Observing remotely with Recovery Girl, Aizawa escalates crises—building tremors, water inundation—intervening only when essential. He deems overcoming such challenges critical for hero licensure. All students evacuate successfully, though some sustain injuries like Tenya Ida's unconsciousness. Aizawa considers the outcome proof of their potential and plans intensified training.