Doppio is The Boss' younger, more innocent and eccentric underboss. As a member of Passione, he thinks of himself as the most loyal subordinate to Diavolo, but in reality, the two are separate souls inhabiting the same body, he helps Diavolo to act and move around undetected. The first boss of Passione, Diavolo seeks absolute security and superiority by eliminating all traces of his past. Doppio will try to conceal Diavolo and if feeling threatened, Diavolo will take over and kill you.