Yes, Luca was a hell of an insane kid because he saw his mother being raped. Few years of psycho therapy might've changed him, if he lived in different time.
Maybe his problem was the fact that he was surrounded by (more or less) corrupted, unfriendly people that only cared about his title. I mean, all the girls on the court only pay attention on money and titles. He probably NEVER had a chance to meet anyone who'd be a true friend to him, thus helping him in a certain way to get over his mother's death. If he met a girl that'd like HIM (not his title, or his gold), he might've turned out to be a different person. Of course, it's impossible to meet such a girl when you're a prince living in a palace, surrounded by people that don't giva a dime about you as a person. Yeah, I think being a prince is not always as great as it seems.
But I'm still not sure about him being a teenage girls' poster icon. But hey, on the other hand, better Luca then someone like Sheena
Sir Maldon, the mighty knight of Greenland, bringer of fear and destruction, destroyer of wine barrels, pride of Imperial Heavily Armored Knights Special Elite Destroyer Unit, evil monsters' WORST nightmare!!!!!!!!