Orochimaru (大蛇丸, Orochimaru) was one of the most powerful ninja Konohagakure ever to live. He was one of the legendary Sannin, but defected from the village in pursuit of his own self-seeking desires, such as learning every technique. Prior to his defection, he was an ANBU-level shinobi.
Orochimaru's various human experiments took place so as to serve two purposes, most prominent of which was his desire to learn every technique in the world. He was often described as twisted by a large number of people.
The Techniques Orochimaru knows are unknown.
The tools Orochimaru uses are also unknown.