Slender Man

The Slender Man is the titular main antagonist from the game of the same name who was made popular on the internet, who first gained stardom in the Something Awful forums and branching out across the web as a figure that has established his own mythos. He is popularly believed to be some sort of malevolent fairy or demon that abducts and psychologically traumatizes people, particularly children.

He is widely recognized as a sort of pop culture icon and also a very controversial figure, and is a prime example of a creepypasta villain at its best, being featured in many fictional stories around the web.