Sasuke Uchiha is one of the most important Naruto ... the story develops in a direction that's different from Kishimoto-sensei's outline. Various factors can explain this. But the biggest reason ...

Once thought to be the only surviving member of the Uchiha clan besides its destroyer Itachi, Sasuke Uchiha spends the first part of the series hellbent on vengeance. He's willing to do anything ...