Behavior
Much of the fascination with Slender Man is rooted in the overall aura of mystery that he is wrapped in. Despite the fact that it is rumored he kills children almost exclusively, it is difficult to say whether or not his only objective is slaughter.
Often times it is either reported or recorded that he can be found in sections of woods, and these generally tend to be suburban. He also has been reported seen with large groups of children, as many photographs portray. It is commonly thought that he resides in woods and forests and preys on children. He seems unconcerned with being exposed in the daylight or captured in photos.
It is often thought as well that he enjoys stalking people who become overly paranoid about his existence, purposefully giving them glimpses of himself in order to further frighten them. For this reason, it seems like Slenderman very much enjoys psychologically torturing his victims.
He also often appears to float or drift around rather than walk, which suggest the possibility of him being an ethereal being rather than a creature or a man. This would also explain why he is able to remain mobile in spite of his poorly proportioned body.
Even though Slender Man was fabricated on SomethingAwful forums (or was he?), some people have already claimed sightings. He is seen mostly at night peering into open windows and walks out in front of lone motorists on secluded roads.
His main intentions appear to be kidnapping children, as when he is seen near them in photographs, they usually disappear shortly afterwards. The Slender Man has also inspired many stories such as those of Marble Hornets.
In the end though, his purpose remains unknown.
An interesting take on Slender Man by a pasta member who is relying on the Marble hornets series for evidence/facts:
"There has been a big misconception about my pal the Slender Man due to the appearance of this article. He does not have hair or a face. Everything else is correct. There is also some questioning as to whether or not there is more than one. I find that unlikely. It's most likely Slendy fucking with your head in order to make you think that there is more than one, which he has been known to do. As of now, Slendy has 3 or 4 known accomplices.
These are Hoodie, Maskie, The Rake and possibly The Observer. Not much is known yet because the next episode of the Noah Maxwell ARG has not yet been released. In the Marble Hornets ARG, Hoodie and Maskie are possibly his followers. In the Everyman HYBRIDS ARG the Rake seems to be working with him, but we aren't really sure if that is true or not."
