As far as Harry Potter villains go, Bellatrix Lestrange is one of the most terrifying. Her love and admiration for Voldemort pushes her to places very few Harry Potter villains go to. It's not about power, overtaking Voldemort, it's about doing whatever she thinks will get his attention like a little girl with a big crush. Her actions are chaotic and psychotic, and the performance by Helena Bonham Carter puts Bellatrix Lestrange into a whole new category of Harry Potter villains.