Calla Potter

AU. Calla Potter has always been hiding. From bullies, from the Dursleys, from the teachers who only ever noticed when she didn't pay them rapt attention. But she is also the twin sister of Harry Potter, the so-called Boy Who Lived, and when they begin at Hogwarts, she must come out of the shadows and face the world, no matter what it means for her. (Slow-burning canon divergence.)