The End Is the Real Start

(Please read: this doesn't relate to my religion, and it is done for entertainment purposes only. I don't believe in reincarnation, and so does my religion. The first paragraph in the description is the only thing I can guarantee true depending on my religion.)

After someone dies, he or she should take responsibility for his or her actions. If his or her sins were more than his or her deeds, then he or she shall be punished for whatever sins they committed and burn in the hellfire. However, he or she had more deeds than paradise shall be his or her gift for the patience and goodness he or she showed.

But, what if you were given a second chance? What if you were reincarnated into one of your favorite animes?
Would you participate in the storyline and change some events? Or will you choose to stay a background character? Would your presence affect the others? Will they only consider you an enemy? Or an acquaintance?

These questions shall be answered if you wish to continue reading the story.