Naruto: It Begins with Stopping Obito During the Nine-Tails' Attack

Transmigrated as Uchiha Feng, he awakens the Mangekyo abilities Yata Mirror and Izanagi no Mikoto.

Yata Mirror can copy a target's innate talent or physique, as well as one of their ninjutsu. Izanagi no Mikoto can revive a target by sacrificing one of the user's innate talents or physiques.

According to the timeline, Uchiha Feng knows the Nine-Tails incident is about to begin. How will he stop Obito?

So Uchiha Feng decides to put his Mangekyo to use. He follows Kakashi, and while Kakashi is paying his respects to Rin and Obito, Uchiha Feng uses his Mangekyo to copy Obito's talent and obtain the Kamui dojutsu. His ocular power also doubles.

And so, the strongest Uchiha in the Shinobi World is about to be born.