Vinegar Doppio is the alter ego of Diavolo. Doppio's appearance is youthful and innocent, with short, light-colored hair and a timid demeanor. He often dresses in a neat, simple manner, reflecting his unassuming nature. Despite his seemingly harmless appearance, Doppio possesses a dark side, capable of extreme violence when provoked or when executing Diavolo's orders. He exhibits signs of dissociative identity disorder, frequently switching between his own personality and that of Diavolo