Shota Aizawa, the Pro Hero Eraser Head, serves as U.A. High School’s homeroom teacher for Class 1-A. This tall, slender man has pale skin, perpetually tired black eyes, messy shoulder-length black hair, and unkempt facial hair. His hero costume features a black long-sleeved shirt, matching pants tucked into boots, a utility belt, and a wrap scarf concealing bright yellow goggles. Severe battles left him with a scar under his right eye, cost him his right leg to halt a Quirk-destroying drug, and necessitated an eyepatch after Tomura Shigaraki damaged that eye. Eight years post-Final War, he sports shorter right-parted hair and semi-retires from active duty to teach. As a U.A. student, Aizawa befriended Hizashi Yamada (Present Mic) and Oboro Shirakumo. In his second year, he rescued a rain-soaked kitten, leaving his umbrella as shelter—a glimpse of early compassion. Oboro later brought the kitten to school, where Nemuri Kayama (Midnight) adopted it. Doubting his hero potential due to his Quirk’s perceived limits, Aizawa was encouraged by Oboro to specialize in combat support. During work-study with the Purple Revolution Agency, Oboro lent him goggles to counter a smoke-generating villain, inspiring his signature gear. Oboro’s death shielding children from villains devastated Aizawa, driving him toward solitude, rigorous training, and a resolve to become an underground hero focused on anti-villain operations. Stern, logical, and reserved, Aizawa demands excellence from students, deploying "logical ruses" like expulsion threats to push their limits. Though seemingly apathetic, he risks his life for their safety—as during the U.S.J. attack—guided by Oboro’s loss to prioritize preparedness against casualties. He reveals rare warmth as Eri’s guardian and foster father, meticulously overseeing her well-being. Despite stoicism, he grins when impressed by students or after successful deceptions. His Quirk, Erasure, nullifies others' powers through eye contact but causes dry eyes requiring drops and deactivates if he blinks or loses line of sight; mutation-type Quirks remain immune. Aizawa augments this with combat mastery: his "Binding Cloth" scarf enables mobility and capture, honed over six years. He exhibits high pain tolerance, tactical brilliance, and hand-to-hand proficiency, battling multiple foes even when gravely injured. Aizawa shares a lifelong bond with Hizashi, who coined his hero name. He initially clashed with All Might over teaching but later offered mutual respect. He mentors Hitoshi Shinso in Binding Cloth techniques. For Class 1-A, he evolves from skepticism—questioning Izuku Midoriya’s potential—to defending Katsuki Bakugo’s integrity against villain accusations and guiding Shoto Todoroki toward teamwork. He mourns Midnight’s death in the Paranormal Liberation War yet prioritizes student safety. He favors cats, salty licorice, and napping in a yellow sleeping bag. Living simply with sparse quarters, he avoids the spotlight as an underground hero. His hero name, "Eraser Head," originated from Hizashi during their school days.