Slender Man

Slender Man is very tall and thin with unnaturally long, tentacle-like arms, which it uses to capture prey. It has a white, featureless head and appears to be wearing a dark suit and tie. He often appears to be floating or drifting. He is commonly said to stalk, abduct, or traumatize people, particularly children.

Often it is reported that he has been seen in sections of woods in and around suburban areas. He has also been reported to be seen with large groups of children.

He enjoys stalking people, making those people become overly paranoid of his existence. Many feel he enjoys psychologically torturing his victims.

According to Wikipedia- Slender man is a fictional character
(The Slender Man (also known as Slenderman) is a fictional character that originated as an Internet meme created by Something Awful forums user Victor Surge in 2009.)

Aleks Krotoski, a commentator for BBC Radio 4, called the Slender Man "the first great myth of the web".

Many that have had experiences with the Slenderman would disagree that he is a myth.