I'm Hermeh, and I'll be your resident Hermione Granger, Parvati Patil, Lisa Turpin (who would probably know Cho?), Narcissa Malfoy, and Aurora Sinistra!
I know Hermione and Parvati would know her from the DA, and Lisa from Ravenclaw. She'd probably know Professor Sinistra if she was in Astronomy.. And.. uhm.. yeah. :D