Rinnegan is the power that make user have metempsychosis eye, This power is originally possessed by the legendary sage of six paths name Rokudou Sennin (The creater of Ninjutsu), Rinnegan power is superior to Byakugan and Sharingan. The Rinnegan is characterized by gray concentric ripple-like circles around the pupil of the user. Currently Nagato or Pein of the Akatsuki is the only person who possesses this rinnegan power and ability. He activated the Rinnegan power during a battle with the Iwagakure Chuunin, after the traumatized event he seems to keep it active constantly all the time.
Pein is the leader of Akatsuki the criminal oganization. When he was young Pein, Yahiko and Konan were left orphaned by Amegakure’s wars, forcing them to fend for themselves to stay alive. The three eventually met Jiraiya who looked after them and taught them basic ninjutsu for three years. During this time Pein awakened his Rinnegan power so he could save Yahiko from an enemy ninja, though the ninja’s resulting death traumatized him. Jiraiya gave him advices to get over the event. After Jiraiya left, Pein, Yahiko and Konan pursue their own goals, news reached Jiraiya that they had all died. While the circumstances of this event are unexplained, Pein has lost all the love he once had for his former teacher Jiraiya.
During the time skip, Pein with the rinnegan power and ninja followers eventually began a civil war within Amegakure, which he subsequently ended the life of village leader, The salamander king Hanzo by singlehanded. To make sure there were no sympathize of Hanzo remaining in the village, Pein killed everyone who related to Hanzo including family and friends reducing them all to zero, elevating him to god-like status amongst the townspeople. He now uses the megakure village as his base of operations for Akatsuki, where he is partnered with Konan. Although he directs the actions of the other members and maintains authority over them, Pein takes orders from Tobi whom refer himself as Mandara Uchiha.
Pein is shown to have six bodies in his secret room that he can switch between by using a machine. Two bodies he has been seen in, the only consistent physical characteristics are a large number of piercings and his Rinnegan eyes. He implies that each of the bodies have a specific purpose, as he switches to one body solely to kill an intruder. One of the only named abilities he is seen using, the Shapeshifting Technique, also deals with bodies using human sacrifices, Pein can create clones of his subordinates, which are under their control and can be used to engage their enemies without risking their own lives. The clones formed are perfect copies of the original, possessing any unique genetic traits or weapons they may possess. The clone’s abilities are proportionate to the amount of chakra given to the clone. As a child, Pein also utilizes the Wind Release Violent Wind Palm, a technique that creates a powerful gust of wind to attack the enemy. Pein has displayed the ability to control rain, and can detect the movements and chakra levels of people traveling within it. Although he has not been seen in battle, Konan states that Pein has never lost a single battle.
In the latest chapter Pein summoning ability is finally reveal, he summon a giant crab to fight his former teacher jiraiya by was later destroy by jiraiya wild lion’s mane techniques. Pein said to jiraiya that pain had made him grown from a person into a god and his plan to teach human the meaning of pain. The true power of rinnegan is currently unknown.