Draco Malfoy
Crouch/Moody becomes noted for teaching and demonstrating normally higher-level topics to Harry's fourth-year class (such as the Unforgivable Curses). He is a demanding teacher who expects students to work. He puts up with very little, for example punishing Draco Malfoy by transforming him into a ferret to stick up for Harry when Malfoy was tormenting him.