Principal William S. Willoughby (born on c. mid-1930s or early 1940s) is the principal of Lindbergh Elementary School. He is voiced by Rob Paulsen. He can be described as energetic, enthusiastic, and over the top. He seems to be everything a good elementary school principal should be. He is approachable, kind, strict, and has a gentle nature to him, not to mention the fact that he's fairly clueless when it comes to most aspects of life. Despite this fact, he seems to have a knack for his chosen profession. He seems to genuinely care about his students, and has clearly taken the time to get to know each and every one. In Beach Party Mummy, Principle Willoughby found out he has been tricked by the kids ("Wait a minute! We don't have a tanning salon!")