This is Dolores Umbridge. In Harry, Ron, and Hermione's 5th year she is the Defense Against the Dark Arts teacher. She makes everyone read and not do any magic. For detention she gives lines and makes them use a special quill that uses their blood as ink and what they write on the paper appears on the back of their hand. She is the Hogwarts High Inquisitor. She inspects every class and sacked almost every teacher. She even wanted to send Dumbledore to Azkaban! She eventually got Slytherin's locket slot to her by Mundungus who stole it from Harry, Ron, and Hermione.