Naruto (manga)
A criminal who served as the principal villain of Part I. He was Hiruzen's student. Orochimaru joined the Akatsuki and worked with Danzo. Orochimaru wanted to live forever so he could learn every jutsu. He did experiments on other ninja. Then he made his own ninja village, the Hidden Sound Village. He used the village to experiment on people and make an army.  He wanted to use the army to destroy Konoha.  To live forever, he changes his mind to different bodies every few years.  He wanted to use Sasuke's body to live in. After the end of part II, Orochimaru stopped fighting Konoha. He made Mitsuki instead. Yamato watched him.