Board Thread:Naruto Discussions/@comment-25100062-20140718213149/@comment-28861328-20140719173952

Sasuke is an emotional child who acts according to his feelings. That is well established. If he feels good, he acts rather mellow. If he's feeling rather murderous, well then damn the world. As a fellow writer, I see why Kishimoto is writing Sasuke this way. You say its because his personality actually changes. I say its because Sasuke merely acts on his feelings and those can vary from mellow to completely psychotic.