I like a MC who's an experienced adult, who's a good guy that treats everyone else well unless they really screw him over, who's super horny and looking to fuck at the drop of a hat with just about anyone, who's not possessive about his relationships and is cool with anyone he's with having sex with multiple partners, and who gradually develops into a complete badass stud as the game progresses from start to finish.
I don't want a guy who's an asshole to people, especially without good reason. Who wants to hurt people, especially women. Who's focused on revenge or retaliation. Who wants to dominate others, and doesn't treat them as equals. Who's naieve, innocent, sexually inexperienced, too young, or not horny for whatever reason and has to be talked into it.