I could be a pitcher. Or the antagonist. I'm assuming any narrorators structure events and the character/s must react accordingly?
As for Ideas I have a few:
A few children find out that their parents are reptilian. They have to stop them from killing their other relatives and replacing them with dopplegangers.
A boy wanders off from his campground and becomes lost. He winds up in another world with a demonic forest with beasts running through it.
Two little girls live out in a small desert community. One by one people begin disappearing ever since a a meteor fell 25 miles away. When a government facility is built the paranormal starts to occur.
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn