Slender man is a tall, faceless, spooky man in a suit with tentacles that come out of his back. Although Slender Man is a completely fictional character, he leads to all sorts of stories and leaves people’s imagination running wild. Listen as we discuss the lore behind Slender Man and briefly discuss how this fictional character has impacted real life stories. 

Source: Creepypasta Wiki | Fandom 

https://www.deviantart.com/victor-surge

The failed Slender Man movie was a nail in the coffin of a dying fandom - The Verge

The Legend Of Slender Man, The Faceless Figure Who Preys On Children (allthatsinteresting.com)