Pig-Pen

Pig-Pen is a character in the comic strip Peanuts by Charles M. Schulz. Pig-Pen's gimmick is that he is always dirty. He is best-known for the cloud of dirt and dust that follows him wherever he goes. When he takes a deep breath such as to sing, the dust rises briefly around him. He sometimes refers to it somewhat nobly as the dust of ancient civilizations. He cannot and will not wash it off for more than the briefest of periods. In fact, he is referred to in an early strip as the only person... full article at wikipedia