Vinegar Doppio, underboss of the Italian crime syndicate Passione, shares a body with Diavolo, the organization’s enigmatic leader, as part of a fractured split personality. His youthful appearance—marked by a slim frame, freckled face, light irises, and pink-to-purple hair pulled into a ponytail—clashes with Diavolo’s imposing physique, raising initial confusion over his paternal connection to a teenage daughter, later resolved by their shared physical form. Doppio’s casual attire, including a cropped sweater and studded jeans, underscores his unassuming facade. Loyal to a fault and prone to erratic behavior, Doppio interacts with Diavolo through hallucinations of improvised “phones,” oblivious to their cohabitation. Though typically courteous and playful, he harbors a volatile temper when interrupted. His devotion compels him to execute dangerous missions for Diavolo, though memory gaps caused by their mental link often erase crucial details post-task. Born to an imprisoned mother, Doppio remained in her womb for two years before adoption by a priest. A childhood of isolation and perceived inadequacy culminated in tragedy when he discovered his mother’s preserved corpse, triggering the murder of his guardian and the destruction of his hometown—an anime-exclusive backstory illuminating his fractured psyche. As a Stand user, Doppio channels partial abilities of Diavolo’s King Crimson, wielding Epitaph’s ten-second precognition and the Stand’s disembodied arms in combat. Diavolo temporarily activates these powers during crises, such as Doppio’s battle against Risotto Nero. An alternate reality in *JORGE JOESTAR* depicts a Doppio with an independent Stand that morphs objects into communication tools, reinforcing his telephonic motif. Throughout *Vento Aureo*, Doppio aids Diavolo’s anonymity by mimicking Trish Una’s spiritual aura. His final act unfolds during the Chariot Requiem arc, where his soul, displaced into Bruno Bucciarati’s body, meets a fatal gunshot from Guido Mista. Even in death, he desperately seeks connection with Diavolo, clinging to loyalty amid abandonment. Doppio’s psyche exhibits dissociative identity disorder and schizophrenia-like symptoms: memory voids, object-based hallucinations, and migraines during personality shifts. Diavolo covertly manipulates these lapses, erasing his awareness of their coexistence. Non-canonical portrayals, such as *JORGE JOESTAR*, explore alternate iterations where Doppio operates independently, trading his docility for aggression while retaining communication-themed Stand abilities.