Jin Bubaigawara, alias Twice, wields the Quirk "Double" to create perfect clones of people or objects after precise measurements. These autonomous duplicates replicate the original's appearance, personality, abilities, and Quirks, disintegrating into liquid upon fatal injury. Originally limited to two clones per target, self-duplication bypassed this as the clones could also use Double. Severe trauma prevented Jin from cloning himself for years, a limitation he later overcame. His ultimate technique, "Sad Man's Parade," generates an overwhelming army through exponential self-cloning. Jin displays an unstable personality marked by rapid contradictions in speech and behavior, stemming from dissociative identity disorder (OSDD-1) triggered by Quirk-related trauma. His distinctive black-and-gray full-body costume and mask—featuring a gray upper half with white eye sockets and a black lower mouth covering—stabilize his mental state, creating a cohesive identity. Without it, his dissociative symptoms worsen, causing internal arguments between split personalities. He stores measuring tapes in his wristbands for cloning and combat, wielding them as razor-sharp weapons capable of slicing solid ice. Orphaned in middle school after his parents died in a villain attack, Jin faced neglect and instability. As a teenager, he accidentally injured a pedestrian in a motorcycle accident while obeying traffic laws, resulting in a criminal record, job loss, and homelessness. Overwhelmed by loneliness, he abused his Quirk to create clones for companionship and labor, declaring himself their "king." The clones rebelled, questioning their identities and initiating a nine-day conflict where they restrained Jin and fought each other to the death. The sole survivor, Jin sustained a forehead scar and lost certainty about being the original, plunging him into chronic dissociation and self-doubt. Recruited into the League of Villains by broker Giran, Jin found acceptance for his instability and formed strong bonds, fiercely protecting allies like Himiko Toga. His loyalty intensified after Magne's death during a failed alliance with yakuza leader Overhaul, fueling his desire for vengeance. Jin's strategic acrobatic skills and clone tactics proved invaluable; Tomura Shigaraki considered his Quirk essential for the League's goals, while antagonists like Overhaul and the Meta Liberation Army sought to exploit it. Pro Hero Hawks later identified him as the most dangerous lieutenant in the Paranormal Liberation Front—the League's evolved form—due to his Quirk's catastrophic potential. Confronting Skeptic's clones during the Meta Liberation Army conflict forced Jin to revisit his trauma. He ultimately realized he was the original Jin, overcoming his fear of self-cloning. This breakthrough solidified his resolve to protect the League, which he viewed as his home. Despite lingering dissociative episodes, he prioritized his allies' safety above all else. In the Paranormal Liberation War, Hawks targeted Jin to prevent mass cloning. As Jin prepared to unleash Sad Man's Parade, Hawks fatally stabbed him. In his final moments, Jin created a clone to rescue Toga and Mr. Compress, expressing contentment in saving his friends. His death highlighted the duality of his legacy: a villain deemed irredeemable by hero society, yet a devoted protector to his allies. This complexity challenged simplistic notions of heroism and villainy, emphasizing his role as a victim of societal failure and untreated mental illness.