Read.

I basically have 2 beginnings for the story.

1-The first goes back to Kaguya's time where the MC will be reincarnated as such, the MC will become interested in the world of Naruto upon seeing Kaguya interacting with the divine tree.

2- The second beginning for the story can be in the time of Madara Uchiha, right in the final fight of Madara Vs Hashirama where Madara almost died.

To clarify, the MC will be constantly changing bodies to stay alive, it is necessary that, he will inherit the reverse technique and most of Kenjaku's techniques Including domain expansion, if they choose Madara's beginning, Kaguya's Beginning will still occur however they will occur. things that will change the canon a little, The MC will be interested in the 10 Tails and what he wants is to obtain that power.

Kenjaku's cursed technique will be influencing the MC, both Kenjaku's and the MC's personalities combined creating a unique personality, The Chakra reserves will be housed in the brain, instead of the body, the reserves that are housed in the brain will merge with the reserves of the body that the MC occupies.

The MC will travel between multiple clans throughout history so He will have plenty of knowledge, the MC will have his own Clan which will be founded from the time of Kaguya, he may implement Gojo and a kind of recreation of Sukuna in this world, however they will not be the OG, in the case of Gojo yes It will be his appearance and his powers but adapted to the world of Naruto, as for Sukuna it will only be the inherited powers, both will be born in the MC Clan in the Naruto timeline. Therefore, before everything begins in the original plot, as I said before, the MC will be traveling around.

(Do not take this fanfic for granted, it may one day end up being released. In that case, I will give you a summary of what will happen in the Finally, I will not be very constant since I am one of the creators who write when they are inspired).

That's all.