8. Bellatrix Lestrange
As much as audiences loved Bellatrix, she really was an awful, psychotic b*tch. She is intimidating and utterly terrifying, and even her hair is bigger than everyone else's, probably because it's full of Voldemort's secrets. She was the Dark Lord's number one fan and seems all the more evil because of her lack of any semblance of femininity, maternal instincts and by disowning her own sister for marrying a wizard who was muggle born, she clearly thrives off being evil. Let's not forget that this sadistic and torturous witch killed off everyone's favourite Black (Sirius, obviously) and poor little Dobby, as well as being responsible for torturing Alice and Frank Longbottom and Hermione. Thank God for Molly Weasley.