Shota Aizawa, the Underground Hero Eraser Head, serves as homeroom teacher for Class 1-A at U.A. High School. He possesses a slender, tall frame, pale skin, and messy shoulder-length black hair partially obscuring his face. His perpetually fatigued look features stubbly facial hair and half-opened black eyes. His hero costume includes a black long-sleeved unitard-like top and pants, a utility belt, boots, and his signature white capturing weapon wrapped around his neck, supplemented by yellow goggles in combat to hide eye movements. Significant injuries alter his appearance: a deep scar under his right eye from the U.S.J. incident; a self-amputated right leg replaced by a prosthetic to stop a quirk-destroying bullet during the Paranormal Liberation War; and a lost right eye clawed by Tomura Shigaraki, resulting in an eyepatch. Post-war, he sports shorter hair parted to the right, covering the missing eye. As a U.A. student, Aizawa was gloomy and introverted, doubting his hero potential due to his quirk's limits. Friendships with classmates Oboro Shirakumo and Hizashi Yamada (Present Mic) drew him out, Oboro's encouragement proving pivotal. The trio planned a hero agency together, but Oboro's death during a villain attack profoundly shaped Aizawa. This tragedy cemented his hero commitment yet intensified solitary tendencies, driving him toward covert villain suppression as an Underground Hero. Years later, discovering Oboro's corpse repurposed into the Nomu Kurogiri caused severe grief, compelling Aizawa to confront the responsible scientist and strengthening his resolve to shield students from similar fates. Aizawa's personality is stern, reserved, and logic-driven, showing little regard for social niceties. He frequently naps in a sleeping bag, projecting apathy, yet holds high expectations for students, employing harsh methods to prepare them for heroism's harsh realities. He utilizes "logical ruses"—deliberate deceptions like threatening expulsion to motivate—later reinstating expelled students to teach resilience. Despite his severity, he deeply cares for student safety and growth, risking his life to protect them during attacks. This protectiveness extends to his role as Eri's guardian and foster father, attending to her needs diligently. His trauma over Oboro's death informs his teaching philosophy: preventing needless student deaths while shaping heroes who inspire others and live long lives. His quirk, Erasure, nullifies emitter- and transformation-type quirks via eye contact, the effect ending if he blinks. Prolonged use causes severe eye dryness. Compensating for his quirk's limits, he mastered the Binding Cloth combat style over six years, wielding his capture weapon for mobility, restraint, and close combat. He exhibits exceptional stamina, fighting through injuries like shattered limbs and skull fractures during U.S.J., and amputating his own leg without hesitation to preserve his quirk. His tactical intellect enables rapid quirk analysis and coordination, such as suppressing High-End Nomus during raids. Key relationships define his development. His lifelong friendship with Hizashi Yamada (Present Mic) endures despite contrasting personalities; Hizashi coined his hero name "Eraser Head." Aizawa initially clashed with All Might over teaching methods and favoritism toward Izuku Midoriya, but mutual respect grew post-All Might's retirement, with Aizawa offering support. Among students, he initially dismissed Izuku Midoriya as hopeless but acknowledged his growth, especially after Izuku defended him during the Paranormal Liberation War. He recognized Katsuki Bakugo's potential despite brashness, defending him publicly and mentoring his progress. He also trained Hitoshi Shinso, gifting him a capture weapon and facilitating his transfer to the hero course. As Eri's guardian, he balances her safety with quirk development, using Erasure to contain her rewind ability. Post-Paranormal Liberation War, Aizawa continues teaching with permanent injuries, adapting his methods. He coordinates strategies against Tomura Shigaraki, leveraging Neito Monoma's copied Warp Gate and Erasure quirks. His focus remains ensuring student survival and growth, honoring Oboro's memory by fostering heroes who value their lives while inspiring others.