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.]