Probably that asshole who's probably going to get himself (and the rest of the group) into deep shit and stay alive out of spite
Santo is a little prick, plain and simple. He's very charismatic, especially for his age, but it seems as though he doesn't think of other people as...well, people, but rather objects which he's in every right to use to his own advantage. He has a pretty short fuse, inherited from his father's side of the family, and whenever that fuse blows his first instinct is to use violence against whoever made it do so. His high temper means that he doesn't often have a chance to plan out his actions, but when he does he plans them well and will resort to desperate measures to go through with those plans, not thinking twice to "take care of" any poor sap who gets in his way and most likely won't feel any remorse for it afterwards. In fact, he'll probably be laughing all the way to prison. He's extremely sarcastic and has a very hard time taking anything seriously. If somebody comes crying to him about their problems for God knows what reason he'll either laugh in their face and outright tell them that he doesn't give a shxt or "charm" them with his "witty" sarcasm. Empathy? Pah, he's probably never heard of such a word.
Oddly enough, however, he is actually capable of showing affection. Not so much towards other people, but when it comes to animals he suddenly melts into a soppy old lady. He shows several early signs of psychopathy, but taking pleasure in hurting animals is not one of them. He is also a devout Roman Catholic.
His devilishly good looks and irresistible charm...?
Uh...he was born in Naples, Italy, but had to leave his country and stay with his extended family in Magnolia because of a few business-related issues at home.