Harry Potter and the Order of the Phoenix
Warrington is a member of the Slytherin Quidditch team and the Inquisitorial Squad. When Harry breaks into Professor Umbridge's office a second time to try and find Sirius at Number Twelve, Grimmauld Place, Warrington is the one who catches Ron, Neville, and Ginny trying to keep people away from the office. He brings them all in to Professor Umbridge. But Warrington does spend some time during Book 5 suffering for his bullying: someone curses him with "a horrible skin complaint that made him look as though he had been coated with cornflakes" (30.5). It clears up, but, man, that sounds disgusting.