I am a Time Shifter.
I have no actual existence except for in the time periods I shift to.
I know the past, the present, and the future. I know all the alternates of what will happen if certain events do not fall into place.
It is my job to make sure things work out the way they are supposed to, to make sure that nothing interrupts what is supposed to happen.
My current mission: Make sure Harry Potter has a life to begin with.