Naruto: Sasuke Uchiha's Rinnegan, Explained

gamerant.com:

Sasuke Uchiha is one of the most important characters in the world of Naruto, along with the protagonist of the series, Naruto Uzumaki. Born as a genius of the Uchiha clan, Sasuke was blessed with the power of the Sharingan and was destined to achieve great things as a ninja. With the eyes of his clan and a keen mind to put them to the very best use, Sasuke progressed immensely through the years and ended up becoming one of the very strongest characters by the end of the Fourth Great Ninja War.

Over the years, Sasuke received multiple power-ups such as the Cursed Seal, the Mangekyo Sharingan, and even the Eternal Mangekyo Sharingan, however, no power-up was as big for him as the godly eye of the Rinnegan that he finally received in the Fourth Great Ninja War.

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The Rinnegan is one of the Three Great Eyes in the Narutoworld — the other two being the Sharingan and the Byakugan. Out of all three, the Rinnegan is, by far, the strongest eye and is known to only awaken in people who greatly alter the fate of the world. One with the Rinnegan is known to shape the world in drastic ways, that is, either bring peace and harmony to the world or send it into utter chaos. For Sasuke Uchiha to receive this just goes to show how important his character was to Masashi Kishimoto. As he's stated on several occasions, Sasuke and Naruto and the two sides of the same coin. Often, he makes them progress side by side and Sasuke has also been described to be the Yin to Naruto's Yang. As Naruto received the power of the Six Paths Sage Mode, Sasuke received the Rinnegan as an equivalent upgrade.

The Rinnegan isn't all that easy to acquire, however. In fact, in all of Naruto, only three people are known to have