Idea #22 (Death Note & Disastrous life of Saiki K)

This concept can work with any story base.

The idea is that the protagonist gets access to something similar to the "death note," but instead of deaths being written in the book there are changes to reality. If you know the anime "the Disastrous Life of Saiki K." then you have an idea of what I am working towards. If you don't or need a refresher, when Saiki was young and his powers were unstable kids would make fun of his pink hair so he telepathically made everyone on the planet believe that non-normal hair colors were the new norm.

The idea behind this "reality notebook" is that it can change reality in any way the writer wishes and some examples include that "it can only do so a certain number of times," "cannot force the idea of true love onto another," and "it only affects the planet that you are currently on."

This can be used with any setting, all you need is a way for the protagonist to actually receive the notebook.