Voice Range: Mid Level
Voice Example: https://www.youtube.com/watch?v=Zg1ptpsyZbQ

* Note: Ladies, you are allowed to audition for this character.

Mario is an Acting Prelate of the Holy Church. A pretty boy with blonde hair and fair skin, Mario tends to dress casually. Although he may not appear so, he holds a position of great responsibility while still in his early teens. He detests the inept and indolent, and often lashes out verbally, but he is also a compassionate, dutiful person at his core. His talents in assessing character and abilities, his skillful balancing of hard and soft power, his leadership and ability to use resources to control the game, and his fighting style using a Piano Machine to control nuns like marionettes, have all earned him the nickname "Mario the Puppeteer."

A pretty boy with a sadistic personality. Although he may not appear so, he holds a position of great responsibility while still in his early teens. He detests the inept and indolent, and often lashes out verbally, but he is also a compassionate, dutiful person at his core. Mario enjoys flexing his authority and causing trouble, only relenting when he knows he’s bitten off more than he can chew. While officially working to coordinate the Church's Executors in dealing with the vampire problem that has arisen in Souya, he has the ulterior motivation of acquiring Roa’s research on immortality in order to extend the life of his grandfather. He is willing to betray the Church’s mission of eliminating Roa in pursuit of this research, offering to spare Roa’s life until he can obtain the information, and intending to keep his current incarnation alive long enough to interrogate him.

He shows a strong dislike for an older brother of his who Ciel rescued in the past. When Shiki asks about whether this sibling is genuinely his brother, he replies that it would be smart for him to leave things unsaid.

He has a low opinion of Noel, viewing her erratic behavior with suspicion and half-jokingly threatening to have her executed for disobeying him. He considers her completely incompetent as an ordinary person in over her head. Yuugo Ando speculates that he has some interest in her despite his dislike, since he rarely pays any attention to the individual character of ordinary Executors. When he discovers her actions brutally torturing young and starving vampires and even a human who was associating with them solely to vent her stress in Ciel's route, he is disgusted by her sadism.