There are three parts of him. Doppio, the Innocent, Diavolo the Devil, and Soliddo Nazo is the fictionalized version of himself that was the capofamiglia of the Passione mafia. Before coming to Luceti, Soliddo Nazo was just that, a story Diavolo made up to cover his tracks. In Luceti, it became its own persona. He's pretty much a genius.