Harry and the changing plot

A crazy god decided that Harry Potter fanfics weren't good this days so he sent 7 guys who never asked for that in a parallel Harry Potter world. He granted them a few abilities but didn't give them any choice and phew. Their goal is now to impact the history without changing the key moments of the story. They can do whatever they want and everyone of them can impact the plot. How will they be able to predict the future if they impact the plot too much ? What relationships will they have between themselves ? How will they survive in a world where the history isn't the same anymore simply because of their existence ? Is Voldy really the only guy they need to fear ? Watch how they overcome their difficulties and differences and work each on their own goals in order to realise their dreams which may very well be opposed. I hope you all enjoy reading it !