Mezou Shouji trains as a Pro Hero in U.A. High School's Class 1-A, distinguished by his heteromorphic physique: six muscular arms connected by skin webs, with primary hands and auxiliary stumps, an elongated face bearing black eyes, no visible nose, and prominent scars around his mouth. He perpetually wears a pale blue mask concealing his lower face and neck, stemming from a childhood incident where his unmasked appearance frightened a girl, reflecting Fukuoka Prefecture's prejudice against mutant-type Quirks. His hero costume includes an indigo mask attached to a blue tank top with white eye motifs and an eye-patterned belt. Eight years post-graduation, he adopts a taller, bulkier frame and a ponytail. Despite his intimidating form, Shouji embodies gentleness, selflessness, and cooperation. He bears no resentment, exemplified when he forgave Fumikage Tokoyami after Dark Shadow injured him. Unfazed by others' fear, like Pony Tsunotori's discomfort, he maintains minimalism, eschewing material desires to prioritize protection. This instinct surfaces when shielding a child from rain with duplicated limbs and defending civilians from debris during the Final War. His heroism aims to dismantle societal discrimination against heteromorphs, seeking a better future rather than vengeance, and rejecting violent shortcuts to justice. His Quirk, Dupli-Arms, replicates sensory organs or limbs at his appendages' tips. Duplicated eyes, ears, and mouths enhance perception—detecting Toru Hagakure's distant movements or enabling multi-directional communication. His physical prowess spans strength (540kg force, crushing objects, carrying multiple people), speed (evading Kurogiri and outpacing Dark Shadow while injured), reflexes (dodging projectiles), stamina (sustained sprints post-Tsunotori), and durability (withstanding dismemberment, Dabi's flames, Nine's lasers, and Spinner's sword strikes via duplicated limb shields). Academically, he ranked 6th in the Quirk Apprehension Test and 10th in midterms, showcasing analytical skill in deducing Mr. Compress's Quirk mechanics and Dark Shadow's emotional triggers. Shouji faced discrimination in Fukuoka, prompting his masked existence. Key U.A. events include the U.S.J. incident, Forest Training Camp invasion (losing an arm and suffering burns rescuing Izuku Midoriya), and Nabu Island, where he protected Mahoro and Katsuma Shimano from Nine, tackling him despite grave injuries. He interned under Gang Orca to hone sensory techniques. During the Final War, Spinner tore Shouji's mask during a heteromorph riot at Central Hospital, exposing his scars. Shouji confronted the rioters, empathizing with their pain but condemning violence. He advocated forging positive legacies over dwelling on injustice, aided by Koji Koda's Quirk awakening that calmed the crowd. Eight years post-war, Shouji graduates as the No. 9 Pro Hero and receives the Imamura Peace Prize, cementing his impact on hero society and heteromorph acceptance.