Transmigrate as the Golden Nine-Tailed Fox and Change Naruto's Childhood

The protagonist transmigrates into the Hokage world and becomes Naruto’s other Nine-Tails: golden all over and identical in appearance to the original. He discovers that its strength is actually equal to that of the Nine-Tails at its full power.

From then on, little Naruto has two of the strongest Tailed Beasts inside him, with the exception of the Ten-Tails. Knowing about Naruto’s tragic childhood, the protagonist becomes his best friend. Named Jin Kinklama, also called Jin Nine, he helps Naruto suppress the Nine-Tails and win it over. By the time Naruto, with two Nine-Tails, becomes a Perfect Jinchuriki, no one in the shinobi world poses a threat to him.

What kind of different life will Naruto have? Whatever happens, it will be far happier than the one he had in the original timeline.