Diavolo is a stoic, intelligent, and slightly flirty man. He hides his identity and his face, issuing orders through computer so that nobody ever meets him personally. Diavolo lives most of his life in the shadows, only ever appearing publicly as Doppio, his alternate personality. Doppio is a shorter and slightly more kind verision of Diavolo, but they share a single consciousness. His stand is King Crimson, an extremely powerful Stand with the ability to erase time up to a 10 second time frame.