Yūga Aoyama attends U.A. High School's Class 1-A, projecting flamboyance and a self-declared "superior" attitude while concealing deep-rooted vulnerabilities. Born Quirkless into affluence, his condition fostered crippling insecurities. Seeking relief, his family approached All For One, who forcibly implanted the "Navel Laser" Quirk. This artificial power clashed with his physiology, triggering abdominal agony and involuntary energy discharges beyond one-second usage, necessitating a lifelong support belt for management. Threatened with death by All For One, Aoyama and his parents became unwilling double agents. He leaked strategic intelligence to the League of Villains, enabling assaults on the Unforeseen Simulation Joint and Forest Training Camp. During the U.S.J. attack, he evaded notice by hiding—an absence classmates overlooked. Tormented by guilt, he masked his self-loathing with theatrical behavior, isolating himself during meals and shunning connections as the "U.A. Traitor." His Navel Laser Quirk releases abdominal energy beams, initially hampered by pain and exhaustion. U.A. training refined his control, yielding advanced techniques: - **Navel Buffet Laser**: Shoulder and knee cannons repelling groups. - **Navel Saber**: A luminous blade for melee combat. - **Warp Refraction: Navel Laser**: A wide-scatter beam for evasion or ally support. Preferring ranged tactics over direct fights, he demonstrated ingenuity in the Final War by feigning betrayal to ensnare All For One with Hitoshi Shinso and Izuku Midoriya. Aoyama's arc pivoted on Midoriya, whose shared Quirklessness made him an emblem of heroism. Aoyama covertly sought his guidance through cryptic pleas. Exposure as the traitor brought anticipated condemnation, but Class 1-A and Shota Aizawa recast him as a victim. Aizawa's defense galvanized Aoyama to oppose All For One alongside peers. Post-conflict, he suspended U.A. enrollment for solitary atonement, later rejoining to graduate as a Pro Hero and Toru Hagakure’s sidekick. In *My Hero Academia the Movie: Heroes Rising*, Aoyama aided Nabu Island's defense against Nine. Coordinating with Momo Yaoyorozu, his full-power Navel Laser separated Nine, Slice, and Chimera, proving his combat reliability. Eight years post-war, he sustains bonds with Class 1-A colleagues while thriving as an accomplished hero.