Book 1: Echo (Harry Potter's Little Sister)
Eleven-year-old Annabelle Potter despised living with her aunt, uncle and cousin, the Dursleys. People calling her Annabelle annoys her, especially if she told them several times that she preferred Ann. Ann also hated being in her brother's shadow all the time, whether it was good or bad. She loved her brother anyway, she loved him more than anything else in the world. But during one magical night, a mysterious flying car arrives at Ann's house and brings Ann and her brother to a world full of their kind - the wizarding world.
Disclaimer - I DO NOT OWN HARRY POTTER. I ONLY OWN THE CHARACTERS THAT WERE NOT IN THE ORIGINAL PLOT. ALL RIGHTS BELONG TO JK ROWLING. Also, the picture on the cover is not mine. :)