Yuuga Aoyama trains as a Pro Hero under the alias "Shining Hero: Can't Stop Twinkling" within U.A. High School's Class 1-A. Born wealthy yet initially Quirkless, he developed an inferiority complex. His parents, seeking to fulfill his hero dream and avoid discrimination, contacted All For One, who granted him the "Navel Laser" Quirk. This power emits potent laser beams from his navel, but causes intestinal distress if used beyond one second. A specialized belt controls involuntary energy leakage, publicly attributed to a birth defect. The transaction forced his family into servitude under All For One, compelling Yuga to become an unwilling mole within U.A. under threat of death. Yuga cultivates a flamboyant, narcissistic persona marked by dramatic poses, French phrases, and a craving for attention, often ending sentences with a star symbol (☆). This facade conceals profound guilt and isolation from his traitorous role. He struggles socially, frequently eating alone or avoiding others, yet possesses sharp observational skills—noticing Ochaco Uraraka's feelings for Izuku Midoriya before she acknowledged them. Awkward attempts to connect, like gifting cheese to Midoriya, reflect a genuine desire for camaraderie and recognition of their shared Quirk incompatibility struggles. Enrolled at U.A. on All For One's orders, Yuga leaked information during key events. He informed villains of Class 1-A's location during the U.S.J. Arc but hid during the attack. At the Sports Festival, he placed 42nd in the obstacle race, joined Hitoshi Shinso's cavalry team via brainwashing, and lost to Mina Ashido in the tournament due to his Quirk's drawbacks. His traitorous actions included disclosing the summer training camp location, enabling the League of Villains' ambush. Despite this, he sometimes aided classmates, helping save Fumikage Tokoyami during the camp raid and nearly rescuing Katsuki Bakugo. Yuga's internal conflict intensified when All For One escaped prison and commanded him to lure Midoriya into a trap. Overwhelmed by guilt, he attempted self-sacrifice but was intercepted by Toru Hagakure and Midoriya. He confessed to Class 1-A and U.A. staff, expecting condemnation but receiving support as a victim of coercion. In the Final War, he collaborated with Shinso to feign betrayal, tricking All For One into a vulnerable position for a joint attack with Midoriya, symbolizing his rejection of fear for hope. Post-war, Yuga voluntarily suspended his U.A. enrollment to atone independently, though authorities permitted his return. He re-enrolled in a Hero program and achieved his goal as a Pro Hero eight years later. Now a sidekick for Toru Hagakure, he maintains amicable ties with former classmates, celebrating successes like Shoto Todoroki's rise to No. 2 Hero. His hero costume evolved post-graduation, featuring a shortened visor and black glasses. His Quirk, Navel Laser, emits high-powered beams capable of penetrating concrete. Training at U.A. and interning under the Equipped Hero: Yoroi Musha improved his control, reducing intestinal side effects. His costume enables laser emission from elbows and knees, facilitating techniques like "Navel Buffet Laser" (rapid-fire shots) and "Navel Saber" (a light-based sword). He also harnesses recoil for mobility, such as aerial propulsion. His combat style emphasizes ranged support and tactical distractions, demonstrated during battles on Nabu Island and against Nine's group.