He is mainly known as the "Boss" of the Passione gang, which corrupts the city of Naples by distributing drugs on the streets, making Giorno Giovanna and Bruno Buccellati his biggest enemies. Because of his obsessive secrecy, almost no one knows about his appearance, name and past. Diavolo is also the father of Trish Una and orders the Buccellati gang to bring her to him, at the same time guarding her from the traitor Squadra Esecuzioni.But really, he wants to kill Trish.