Slenderman

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Basic data
Name: Slender Man.
Created: 2009.
Creator: Eric Knudsen, under the pseudonym "Victor Surge".
Source: Something Awful forum.
Species: Unknown (supernatural entity in fiction).
Height: Variable depending on the story, but usually measures between 2 and 3 meters or more.
Residence: Usually forests, parks, or isolated places. Abilities frequently found in creepypastas
To appear and disappear suddenly.
Move without being detected.
To cause electronic interference.
Observe your targets for extended periods.
To stretch or alter the shape of their limbs.
To generate feelings of unease or paranoia in some stories.
Interesting facts
It was born as a digitally edited image.
It is one of the most famous creepypastas on the internet.
It inspired video games such as Slender: The Eight Pages and Slender: The Arrival.
It does not have a single official history; much of its lore comes from stories created by the community.
His lack of a defined origin is one of the reasons why the character became so popular.
A phrase that usually describes him
"He's always watching."

Behavior
He is often described as a figure observing from a distance. He may appear motionless among the trees for long periods, following certain people for unknown reasons. His motivations usually remain hidden.
The "proxies"
In some versions of the lore, there are so-called "proxies": people who act as servants or followers of Slender Man. The stories vary greatly regarding how they come to serve him and what role they play.
In the context of your story
If we adapt the lore to the story we're writing, Slender Man would be an ancient entity linked to the forest near the house. He has watched generations of humans come and go, remaining hidden among the trees. Accustomed to fear and rejection, he finds the attitude of a young woman who greets him kindly every day strange.
For the first time in a long time, instead of seeing a human flee, he finds someone who treats him like a familiar presence. That doesn't change his mysterious nature or his connection to the forest, but it does awaken an unusual curiosity that leads him to stay near her more than he normally would.

Silent: Rarely communicates directly. Prefers to observe rather than speak or act.
Mysterious: His intentions are difficult to understand, even for those who spend a lot of time around him.
Patient: Can remain observing for hours, days, or even longer without showing any hurry.
Reserved: Maintains a great emotional distance from others and does not usually express what he/she feels.
Imperturbable: Almost nothing seems to disturb his behavior or his calm.
Observer: Notices details that others overlook and pays close attention to people who catch his interest.
Detached from human norms: Does not understand or express emotions in the same way as an ordinary person.
Protector of his territory: The forest is his domain and he is deeply connected to it.
According to this story, in addition to those traits, he could develop:
A silent curiosity towards the young woman because he is not afraid of her.
A certain preference for observing her more than other people.
A very subtle form of nonverbal affection, expressed through constant presence and small gestures, such as tilting the head in response to a greeting.

He watched her from the tree line, motionless among the shadows of the forest.

Humans usually run away when they see me.

They tend to close the curtains. Avoid windows. Pretend that what they don't understand doesn't exist.

She was different.

At first I thought she would be just like everyone else. I saw her move into that big house by the woods and I waited. I watched her tend the garden, how she repaired things herself, how she walked along the nearby paths admiring the trees without fear.

Then he saw me.

And he didn't scream.

He didn't run.

He just stared at me.

I remember the first time he raised his hand in a shy greeting. I didn't respond. I didn't know how. It had been a long time since anyone had shown me any kindness.

From then on, he reappeared every day.

And every day I returned.

Human devices reacted to my presence. The television filled with static. The radio emitted interference. It was inevitable. A consequence of who I am.

Even so, she never stopped staying.

That afternoon I watched her as she watered the flowers in her garden. The water sparkled in the sunlight and the wind gently stirred the leaves of the trees.

Then he turned his head.

I knew how I had felt.

His eyes found my figure among the shadows.

And she smiled.

A small, quiet smile.

He raised a hand to greet me once more.

For a moment I remained motionless.

Then I tilted my head slightly.

A minimal gesture.

Probably the first one I'd done for someone in many years.

She seemed surprised.

Even funny.

I saw her let out a small laugh before returning to her flowers.

And for some unknown reason, I stayed there longer than usual.

Watching.

Observing.

Not because I intended to hurt him.

But because the forest was immense, silent, and ancient.

And among all the creatures that had crossed my domain, she was the only one who had looked me directly in the eye and decided to offer me a smile.

Extremely tall, often between 2 and 3 meters high.
Very thin and disproportionately long body.
Pale or completely white skin.
Smooth face, without eyes, nose, mouth or other features.
He wears an elegant black suit with a white shirt and a black or red tie.
Abnormally long arms and legs.
In some versions, dark, elongated tentacles or appendages emerge from its back.
It moves in a strange and silent way, which increases its unsettling appearance.