Slenderman is just what he sounds like - a tall, slender man with no facial features. He usually appears in a black suit. Thankfully, Slenderman is a fictional character (or is he?) created in 2009 by Eric Knudson in the Something Awful forums. Slenderman now appears on the Creepypasta site, as well as numerous Reddits, and even in real-life news stories, as two girls blamed him for their assault on a third. Other appearances by Slenderman include several episodes of crime-solving television shows, a documentary called Beware the Slenderman, and, of course in fiction, like the stories here. You may not want to read them at night.