In Naruto: Starting with a Skill Template

Waking up, Jimo finds himself lying in a grassy field, with an unconscious, yellow-haired boy with spiky hair beside him.

"Jimo, Jimo! Can you teach me that move that sends enemies flying with one big BOOM?"

"Jimo, Jimo! What's that move of yours that can slice right through mountains?"

And so, the Hidden Leaf Village gains a genius who is absurdly powerful-yet has absolutely no idea how strong he really is.

Danzo: "You'll regret this... I'm the one who regrets it!"

The Deva Path: "Capture the Nine-Tails? Don't be ridiculous. Who would dare provoke a being like that?"

Itachi Uchiha: "If I'd met him sooner, perhaps the Uchiha clan would never have suffered such a tragedy."

Obito: "If I'd met Jimo back then, perhaps I would never have gone down this path..."

All the major hidden villages: "If you encounter a ninja cloaked in a golden aura on the battlefield, abandon your mission immediately-no exceptions!"