Fab is a sixieme, but she can definitely be called rowdy! These two might have fun as best friends, especially if the Perrots are one of the pureblooded wizarding families who are willing to overlook Flamel's bad breeding due to their disgusting wealth? Either that, or maybe their families hate each other because the Perrots won't overlook Flamel's bad breeding, and Fab and Nadia can clash. The age difference would've given Nadia a leg up on Fab in earlier years, but this year she has a Prefect badge to abuse.