Zingher

Kyōichi transmigrated to Konoha and became a temporary teacher at the ninja academy, fortunately, he awakened a mentor system. By teaching others, he can earn rewards. So, Kyōichi began his career as a "teacher" in the ninja world.

Shisui: "The teacher's unique Will of Fire has truly helped the Uchiha in finding their path!"

Asuma: "The heart of our responsibility, akin to a precious jewel, lies in protecting the people. With the experienced ones leading those who come after, only in this way can Konoha truly become stronger."

Kakashi: "He is my life mentor, he changed Konoha!"
…

Many years later, Kyōichi, as Hokage, wrote in his memoirs - I really just wanted to be a life mentor!

* AU

* this is a translation

Kyōichi, Konoha’s Life Mentor

"With me here, what's there to fear? Let anyone who doubts you try to do better!"

Kyōichi's experience as a jōnin was undeniably short.

Konoha faced threats from three villages.

They needed competence, not complacency. Letting outdated relics lead would only invite disaster.

Tsunade smirked. "The old man's paving the way for me. The more you succeed, the smoother my path becomes."

Tsunade saw no need for secrecy.

To ensure Kyōichi's reforms took root, to prevent Konoha's decay under the old guard…

Under normal circumstances, Tsunade's lineage and reputation would guarantee her ascension. Even Danzo had retreated, his Root operatives lying low since her return.

Her hemophobia remained a liability.

The Sandaime hadn't asked, but he'd surely learned of her condition through Biwako. Hence, assigning Kyōichi to the eastern front—a role Tsunade couldn't fill.

With limited options, the Sandaime chose Kyōichi—the better counter to Kiri's mist and water tactics.

Kyōichi would head to the frontlines.

Mastering Creation Rebirth would boost his survivability. But Kyōichi had other avenues for growth:

1. System Rewards: Steady gains in medical ninjutsu, water release, and genjutsu.

2. Spiraling Water Blade: Fusing Rasengan with high-pressure water techniques—a safer alternative to the Wind Release: Rasenshuriken.

3. Mount Myōboku: Though Katsuyu's silence suggested his body wasn't ready for senjutsu.

For now, he'd focus on the first two.

With the Chūnin Exams over, his team—Kurenai, Shisui, and Asuma—was ripe for further… milking.

Shisui sat across from Uchiha Tekka, both battered but Shisui less so.

"You have the skill. Why hold back? Don't you want glory for our clan?"

"Glory? The Uchiha need no more fame. Our pride isn't for outsiders to validate."

"I didn't pretend. Might Guy held back—his Eight Gates can multiply his power. He only opened the First Gate."

Tekka knew of the Eight Gates but never imagined the "green clown" wielded such strength.

Shisui noted Tekka's fading hostility. Perfect.

Tekka glanced toward the village, hesitant.

"The clan head ordered this. Some in the village want us dead—Root's leader among them. We must ally with those who tolerate us, not fight the whole village."

Shisui spun his web, confirming no eavesdroppers via chakra sensing.

"So we… team up with the Hokage's faction?"

"Rebrand the Will of Fire to suit our needs. Befriend smaller clans and civilians. Isolate Root."

"Start small. Heal your wounds first."

Shisui guided Tekka to Kurenai for treatment, then sent a shadow clone to Kyōichi's home—where a clone was always studying.

"Sensei! How do we 'modify' the Will of Fire for Uchiha approval? Hurry—it's urgent!"