N.E.S.O.
A N. E. S. O. is a guy who travels like a madman, showing up anywhere, just to mess with kids. He doesn't care if he's caught, he just wants to feel powerful.
"He showed up at my school wearing a cape and a stupid hat."
"He drove to my house in the middle of the night."
"He said he was a detective, but he didn't even know my name."