The Chronicles of the Forgotten Potter

Katherine Potter is Harry Potter's twin sister. She and Harry were separated after the night their parents died. Harry was brought to the Dursley's and she was brought back to Hogwarts, where she lived until they met in their first year. She's highly intelligent, telekinetic abilities, and great unknown powers that strengthen and grow with age. Her powers remain a secret from the Dark Lord for now, but they could be the end of the free wizarding world or his downfall.
I do not own any of the characters or places or anything within the fantastic world of Harry Potter, however, I do own Katherine.