Naruto: With maxed-out affection, I am invincible in the ninja world.

Main character: Uchiha Haneda
Synopsis: [Bonds + System + Uchiha + No Female Lead]
Having transmigrated into the body of a member of the Uchiha clan, I was born with a favorability system. As long as I max out the favorability, I can gain the abilities of the other party.
Thus, an inherently evil Uchiha became the Fifth Hokage amidst a series of unexpected events.
Obito Uchiha: I want to create a world with Rin, Haneda, and Kakashi.
Uchiha Itachi: My capacity, everything I bear, is nothing compared to Haneda.
Uchiha Shisui: Only if Haneda becomes the Fifth Hokage can the Uchiha clan be completely changed!
Tobirama Senju and Danzo Shimura: What?! The inherently evil Uchiha brat has become the Fifth Hokage?!
(Note: The main bond is between Obito and Kakashi; there are sweet and bitter moments.)