 Mukuro is often seen with a playful smile and seems apathetic to the suffering of others.Appearing as the series' first antagonist, Mukuro is not averse to disposing of those who get in his way, and is not easily intimidated, usually speaking to others in a very direct and arrogant manner.Prior to his first appearance, he, along with Ken Joshima and Chikusa Kakimoto, is mentioned to have been locked up in a high security Italian prison, which is reserved for the most dangerous of Mafia criminals, who have even committed crimes against the Mafia itself.