Naruto: From the Start, I Adopted Naruto as My Son, and the Shinobi World Trembled

[Adopting and raising children as a dad / protective, face-slapping power fantasy / building a faction / heartwarming and healing]

He transmigrates into Naruto and becomes a useless genin with the lowest chakra reserves in Konoha.

Just as he's about to be kicked out of the ninja ranks, his System awakens.

[Strongest Dad System: Adopt a godson and grow stronger. The greater the godson's potential, the greater the rewards.]

On the street, he sees five-year-old Naruto, despised by the whole village, and says:

"Be my son. I'll feed you, house you, and help you fight."

His chakra surges, and his strength skyrockets.

Then he sees Sasuke sitting alone among the ruins of his clan compound after the massacre.

"I'm taking this kid, too."

Orochimaru says Sasuke is his vessel.

He sneers: "Call me Dad, or you won't leave this forest."

Danzo says the Jinchuriki are Konoha's strategic assets.

He steps in front of Naruto: "That's my son. Just try laying a finger on him."

The Nine-Tails Jinchuriki, the Uchiha orphan, the One-Tail Jinchuriki, a Hyuga prodigy, Kaguya bloodline heirs...

The whole Shinobi World loses its mind:

"Just how many sons does this man have?!"