Naruto: Darkened Naruto, Rewriting the Shinobi World Through Sin

[Corruption + slow burn + character growth. He won't be instantly overpowering from the very beginning.]

When a soul from another world merged with twelve years of memories from hell, the depths of Naruto Uzumaki's azure eyes were tempered into the ice of the abyss.

Konoha's cold stares, the starving winters, the fists and kicks in dark alleys: the curse of the "Demon Fox" was a poison etched into his very bones.

Konoha's countless lights could not brighten his cage.

A kindly meal, comfort at regular intervals, then a leash called the "Will of Fire": Hiruzen Sarutobi, your dog-training methods are much more respectable than Shimura Danzō's.

"Protect the village?"

The boy licked the blood between his teeth and sneered.

"Why not tear apart this man-eating cage first!"

[Ding! Sin System activated!]

War! Slaughter! Control over one's own life! All fuel for power!

[Nine-Tails Chakra Assimilation (Beginner)]: 10,000 Sin Points (permanent passive skill; increases the body's tolerance to Nine-Tails Chakra, reduces burn damage, and lowers the risk of going berserk)

"This rotten shinobi world..."

Danzō's remains lay beneath Naruto's feet.

﹉﹉﹉﹉

In the name of original sin, I shall overturn the order written by the gods.

The throne of the shinobi world shall be forged from sin!

The order of the shinobi world shall bear the name of original sin!

Naruto Uzumaki, Prologue to The Code of Sin