Orochimaru was overlooked for the position of the fourth Hokage of Konohagakure and since then wanted to kill Hiruzen Sarutobi and destroy Konohagakure once and for all. But, after he was beaten and then resurrected by Sasuke Uchiha, he decided to see how Sasuke Uchiha would achieve his goals and decided to give up plotting against Konohagakure. He is under strict surveillance right now and it seems that he means no harm.
4. Nagato Uzumaki
Nagato Uzumaki was a member of the Akatsuki and in order, to bring Akatsuki the nine tails fox he invaded and almost killed all the people inside Konohagakure. Later, when Naruto Uzumaki told him about his vision, Nagato’s mind changed and he used Rinne Rebirth to bring all of whom he killed back to life and died in the process. His last actions before his death changed him from villain to a hero.
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