The Sharingan is one of the most iconic abilities in Naruto. Kishimoto reveals how he came up with the concept.

This came through Obito Uchiha, who gave him his remaining Six ... but he certainly did have the opportunity to gain the Rinnegan. That said, this opportunity was crushed by Naruto.

Rinnegan is one of the most unique and powerful ... This technique was taught to Obito Uchiha in Naruto. This is an unspecified ninjutsu that allows Sasuke to travel to different dimensions ...

With the power of the Rinnegan at his disposal ... this has made him one of the most powerful characters in the story. Obito Uchiha was responsible for starting the Fourth Great Ninja War ...