Reincarnated as Danzo Shimura

What happens when a smart teenager dies and is reincarnated in Naruto as Shimura Danzo? What will remain and what will change?

[First-time writer.]
[Writing for fun.]
[English is not my first language.]
[I'm a lazy person so don't be mad.]
[Please vote, rate & review.]
[Constructive criticism, suggestions, and feedbacks are appreciated.]
[This is a work of fiction that draws heavily upon the original source material 'Naruto' created by Masashi Kishimoto and it's anime adaptations. Please support the official release and know that I claim no ownership or credit regarding the existence of preexisting characters or content related to the series. The only things I own are the original characters and the altered storyline.]