Please Fix the Story!

I don't know who I am. I don't know why I'm trapped in this never ending cycle of rebirth.

All I know is that I wake up inside the worlds of unfinished stories, with a mission to accomplish the author's wishes and stabilize the worlds now headed for destruction. I do my best, hoping, praying that maybe if I complete enough missions, I'll be able to remember my past and return to my home.

It's just fixing stories, it should be simple enough.

So can someone explain who this random villain is who keeps following me to each world?