Alastor "Mad-Eye" Moody, a fictional character in the Harry Potter series of books, an ex-Auror working for the Order of the Phoenix. All you have to do is stay away from his sight as long as possible.
Remain hidden by avoiding Mad-Eye Moody's gaze and his Dark detectors. You'll also need to avoid the creatures he controls using the Imperius curse. The longer you remain undetected, the more points you earn! You'll gain extra points for picking up two items in his classroom.