I mean when i saw the first episode i said "Ok good guys: Aang, Katara & Sokka, Bad guys: Prince Zuko"
But seeing more episodes i noticed he's just a trouble and traumaticed (for his scar) boy that get his face burned up, was banished from by his own father (!!!) and is like prisoner of his own obsession (Of capturingt tha Avatar to regain his honor) and he has sense of family for example in the epsode that his Uncle Iroh is capture by Earth Benders he decide to let the Avatar go and save his uncle first then off course the change of heart when he get from the Avatar side
What do you think?
He was really evil and then something changed him or just a trouble guy that decided to regain his honor putting himself side by side with the Avatar?