Pein is the leader of Akatsuki the S-rank criminal organization in Naruto series, Pein take orders from Tobi or which he referred himself as Madara Uchiha. Pein at the younger age was known as Nagato. Pein, Konan and Yahiko parent were killed and they were left orphaned by one of many wars, forcing them to fend for themselves. The three eventually encountered Jiraiya who later looked after them and taught them the basic of ninjutsu for three years. Yahiko learn water element chakra, Konan learn paper jutsu and Nagato learn wind element chakra. During three year time Pein or Nagato at that time awakened his Rinnegan transmigration eye power during the battle with Iwagakure chuunin so that he could save Yahiko without knowing what had happen at all during his blackout, though the chuunin killing event traumatized him, Jiraiya gave Nagato words of advice to get over the event, he then come to accept this and seems to keep rinnegan power active constantly all the time. After Jiraiya left the three to survive for themself and they pursue their own goals, news have reached jiraiya that they had all died. While the circumstances of this event are still unexplained. At present Pein has since lost any affection, love and respect he once held for his former teacher jiraiya.
Pein is the descendent of sage of six paths has never lost a battle in his life. The true Rinnegan power will be reveal soon…
For more informations on Pein and Rinnegan power in detail
For more informations on Sage of six paths in detail
sage of six paths
For more informations on Sharingan in detail