Naruto: The Forgotten Uchiha

Renji Uchiha wasn’t supposed to exist in this world. Born a year before Sasuke, he carries a secret far beyond the bloodline of the Uchiha, he is a transmigrator, once an ordinary man from Earth, now reborn into a clan on the edge of extinction. Gifted with the rare power of Kagebōshi Ryūsei, an ability that allows him to burn through his life force to access an explosive surge of chakra, Renji knows the price of his strength: every time he uses it, his lifespan dwindles. But that isn’t his only gift. The passive gathering of life energy, known as Eien Seishin, flows through him constantly, slowly enhancing his vitality and chakra reserves, giving him a seemingly endless well to draw from. With memories of Earth still intact, Renji holds a dangerous advantage, he knows the future, the massacre of the Uchiha, the rise of Naruto, and the devastation that the shinobi world will face. Armed with this knowledge, Renji walks a thin line between changing fate and letting history unfold, all while battling the growing temptation to use his immense power. Will he stand as a shadow behind the key players of history, or will he seize control of his destiny, risking everything for the chance to rewrite the future?