Besides the "Yaaaarrhhh!" screaming during combat, Alto calms down a lot after about episode nine, when he and Michael reconcile. Well, he gets still pissed at Brera, but who wouldn't?
Anyway, Alto is not emo at all. His complaining about his situation is kept to a bare minimum, as to establish that, yes, he has problems with his family. Any bouts of self-justification are normally triggered from outside forces ( Michael at first, then Yasaburo later on ), which simply indicates that he is not exactly comfortable leaving the tradition of being the next Ranzo behind, but determined to make his own future.