Slender Man is a fictional character who is believed to kidnap children who know and are afraid of him. He is completely fake. Some claim it was an internet contest to see who's "scary character" could become more viral. I honestly don't know how he was created. Just the story behind him.
My friend says: "The Slender Man is a supernatural creature that is described as appearing as a normal human being but he is described as being 8 feet tall and he has vectors or extra appendages that are described to be as sharp as swords. The creature is known to stalk humans and cause many disappearances. He is described as a shadow creature that has missing a face. The creature fits into many mythologies in legends from nations such as germany and celts which brings up the possibility that he could be real. A man named victor Surge found this legend and made his own version of it which he called slender man. The slender man is not exactly evil according to mythology but victor Surge's version shows him as an evil creature that stalks humans to kill. In mythology he was actually trying to save you from a painful death by taking you to the under world early. "
Slender Man is a mythical creature often depicted as having a blank face. He is also depicted to being tall, thin and wearing a black suit with a white shirt. He is adapted in games, films and novels. To learn more about Slender Man, visit http://theslenderman.wikia.com/wiki/Slender_Man.
A man that stalks you and flails out his arms to intise fear and then he kidnaps you and kills you in the woods. Hes dressed in a suite. Go on YouTube and type in Marblehornets its pretty freaking creepy. But of course he's fictional.