He is known by many names.
The Tall One
Mr. Thin
The Operator
'Slendy'
Big Brother
The Slender Man



For the sake of these notes, we'll refer to him simply as 'Slender Man'












(Shown above is an artist's representation of what she thinks Slender Man would look like as a deer. Credit; Matthieu. I'm shocked at how accurate this actually is.)










What it is

The Slender Man is, by no means, human. He is a terrible, horrifying entity that gains nothing but absolute satisfaction from slowly and painfully driving his victims to absolute insanity. Sometimes he may kill, though more often than not, he simply follows and stalks his victims.

He plays on the paranoia of the mind. Humans and deer alike are always terrified of the thought of being watched and followed. His presence is not only unnerving, but causes sickness and even death as well.

The Slender Man has absolutely no value whatsoever on human life. To him, creatures exist for his own sick amusement.

He also has an obsession with the use of fire. In several cases, he's used it as a warning to his victims.

His primary targets are children, and in this case, fawns. He'll seek them out, often approaching them directly so that he can kidnap them. However, in many cases, he has been known to play with children and show them kindness, portraying himself as a child-like... even a confused being.

That is not to say that he hasn't killed children either....

Maybe their deaths are accidental... or intentional. We'll never know.

I've observed that, to mark his victims, he uses a peculiar emblem.











It's Abilities

Being a supernatural being, The Slender Man has many curious... and often deadly attributes to him that he always utilizes.

His limbs have no definite length. They can stretch and envelop victims with a single flourish. Upon further inspection, I've noted that his antlers work in a similar fashion. They act as his arms, curling outwards to grip and handle objects.

Shape shifting is another commonly used ability of his. As you can see, he has adapted to the environment of the forest by changing himself to look much like a fellow deer to fool others.

Whenever he is near, some deer may experience coughing spells or bouts of sickness that come and goes as it pleases. Technology is interfered with and often malfunctions. If one meets The Slender Man, they may suffer a bout of memory loss for periods that can last even years.

He can also teleport from location to location, hence his sudden appearances and disappearances from time to time.

With teleportation, he can also allow himself to be seen to only a certain number of people. Because of this, children can often mistake him as an 'imaginary friend' that no one can see save for them.













Common Behavior

The Slender Man is a lurker. Depending on the victim, he usually stands a far distance off, watching and observing. If he is noticed and approached, he'll either teleport away or approach himself (if the victim happens to be a fawn)

If you are sleeping, he may walk up and sit in front of you to watch.

If you're bold enough to approach him yourself, expect to be grazed over with his collecting antlers. The gesture itself is not aggressive, but you're likely to become a victim if you let him do so.

As said before, he'll often play with fawns... only to abduct them to a new location.










Weaknesses and Aversions

There are many, many theories on how to 'defeat' The Slender Man, or at the very least, weaken him.

For one, it's been proven that he visibly slows down if he is being filmed. Not enough to really make a difference, considering that his long limbs and teleportation abilities can bypass it. However, this is still worth noting.

I've also noticed a reoccurring behavior that may also have some connection here. The Slender Man seems to avert from water, both in recorded videos and in the forest.

There is also the common belief that The Slender Man is weakest during the winter solstice.










Theories

The Tulpa Effect
The idea that The Slender Man exists by our own will. If we think of him, he appears. If we refrain from thinking of him, he disappears. He exists only because we make him exist. As plausible as this theory is, I still have qualms about it. Yes, I can think of The Slender Man, but when I turn around and expect him to be there, he is not.

The Core Theory
Based on several concepts coupled with The Tulpa Effect. Presents the idea that, yes, The Slender Man was created based on our beliefs. In this theory, various roles are given to unknown people in order to ultimately 'defeat' the 'monster'. The roles are, the Hero, the Guardian and the Warrior. Each role has its own specific task to complete. The monster resides on another plane of existence, and it's the Hero's job, with the assistance of the other two roles, to defeat the monster... losing his/her own life in the process. I don't know if such an idea can apply to The Slender Man himself, but we can always hope.










History

I didn't find much, but I found evidence that The Slender Man may have originated from Germany with the original name of 'Der Ritter'. Little else is known. All I found otherwise was records of unusual disappearances of children.








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Victims

-Stairway-
A fawn. Will likely be followed and interacted with for several years to come.

-The Twin Deer-
Names are unknown as of now. For now, he seems to think of them more as fawns than adults. This will likely change

-Herla-
Took interest in her for unknown reasons. Was charged by her.






Followers

-The Masked Man-
Originally an actor for an ameturish student project. The Masked Man is considered to be The Slender Man's closest real 'follower'. He is extremely aggressive, often appearing out of nowhere to attack others (possible through The Slender Man's orders?). As of now, there is no sign of him in this particular area. Still, it would be best to keep an eye out just in case.

-Un-
An odd doe that has caught The Slender Man's attention. She knows how deadly he is, yet continues to insist on his company. The Slender Man does not quite have 'friends'... but this doe might well possibly be an exception to that rule.
Unless, of course, he gets bored of her.












((I'd like to thank Mr. Victor Surge and Mr. Jay for publishing essential information that I can pass on to you for your own benefit))





Be careful





He's watching you