The Slender Man which we also know as Slenderman, It is a fictional supernatural character that originated as an Internet meme created by Eric Knudsen in 2009. It is depicted as resembling a thin, unnaturally tall man with a blank and usually featureless face, wearing a black suit.
Stories of the Slender Man commonly feature him stalking, abducting or traumatizing people, particularly children. The Slender Man is not confined to a single narrative, but appears in many disparate works of fiction, typically composed online. Fiction relating to the Slender Man encompasses many media, including literature, art and video series such as Marble Hornets. Outside of online fiction, the Slender Man has had impact on popular culture, having been referenced in the video game Minecraft and generated video games of his own, such as Slender: The Eight Pages and Slender: The Arrival.
Beginning in 2014, a minor moral panic occurred over the Slender Man after readers of his fiction were connected to several violent acts, particularly a near-fatal stabbing of a 12-year old girl in Waukesha, Wisconsin. Source