Orochimaru (Naruto)
In the first part of the series, Orochimaru tried to destroy his former home, invading it with an army of ninja, and killed his former master, but failed to destroy completely the village. He later took Sasuke Uchiha as his apprentice, but was betrayed by him after training him during two and a half years. Sasuke attacked Orochimaru when he was close to death, but Sasuke could not kill him and absorbed him in his body instead.