N.E.S.O.
A N. E. S. O. is a gross man who moves from place to place, always looking for a kid to bother. He doesn't know how to be normal, so he just makes people feel icky.
"He was in my neighborhood, watching me from his car."
"He sat next to me on the bus and whispered stupid stuff."
"He wore a fake beard and a suit, but still didn't hide his grossness."