Sapphire Black, Daughter of Lucy and Sirius...
Sapphire Black is the only daughter to Lucy and Sirius Black.
Sapphire is just like her father in all ways, The hair, The eyes, The prankster vibes, and so on. As soon as she gets to Hogwarts she immediately makes friends with Emerald Lupin, Catrina Pettigrew (who is luckily nothing like her father.) and Helen Potter, older sister to Harry Potter. Follow them as they prank everyone in Hogwarts, maybe even... the famous, Voldemort?
(all recognizable characters belong to J.K Rowling. By the way the girls are one year older then harry so he's not going to be in it much.)