Writing Stories. Haram or not?

I've heard and read proofs that writing fictional stories are haram. Some people, like me, are given talents of writing poems and stories and the like. I've made up a story that is really beneficial and I've always dreamed of sharing this with people, but the main character was born with strange powers (growing claws and teleporting, i.e. moving from place to place in a second.) The story goes on about how he is trying to live despite the people who are chasing after him to end him. Is it haram if I write something like this? If it is haram, can I make him inherit the power by one of his ancestors who was injected by an undiscovered drug?