The Rinnegan is the most exalted among the three great dojutsu. Distinguishable by its ripple pattern that covers the eye, the rinnegan grants it's possessor with quite a few incredible abilities. For instance, whoever wields the rinnegan can see chakra and its flow through the body, as well as easily master any kind of jutsu and all five nature tranformations.
The first person to manifest the rinnegan was Hagoromo Otsutsuki, and it can typically be awakened by possessing his chakra. Just to give a brief synopsis of how epic Hagoromo was, he used his Rinnegan to defeat the ten tailed fox, and created ninshu, a sort of precursor to ninjutstu. There are quite a few epic characters in the Naruto series that possess the Rinnegan however , with the most notable being; Madara Uchiha, Sasuke Uchiha, and Nagato Uzumaki (pain). As stated, this is the most epic form of the three dojutsu, the other two forms are the sharingan and the byakugan.
