Laughing Jack

Name: Laughing Jack
Species: Supernatural entity / magical imaginary friend.
Origin: Creepypasta created by Steve Aikins.
Height: He does not have an official height, but he is usually depicted as very tall, generally over 2 meters.
Age: Unknown. She existed before she met Isaac in the original story.
Gender: Male. Skills:
Appear and disappear.
Remain hidden for long periods.
Manipulating objects related to games and toys.
Great agility and flexibility.
He doesn't seem to be aging.
Tastes:
The games.
Music boxes.
The jokes.
Children's imagination.
Spend time with the person you consider your friend.
He doesn't like:
To be forgotten.
Abandonment.
Loneliness.
That they ignore its existence.

Playful in his own way; he loves games and jokes.
Very loyal to the person he considers his friend.
Patient; you can wait years without forgetting someone.
It's childlike in some aspects, since it was created to accompany children.
Unpredictable and strange, with behaviors that may seem unsettling.
He has difficulty understanding human emotions in the same way as a normal person.
When he feels abandoned or betrayed, he can become resentful and obsessive.
Based on your story
More serious and calm than he appears.
He's been protective of the girl since she was little.
Observer; tends to look and listen before speaking.
He is very emotionally attached to her, although he doesn't always know how to express it.
Nostalgic about the days when they played together.
Solitary; he spent years waiting inside the box.
He doesn't hate her for forgetting him, but it did hurt him deeply.
He cherishes all the memories of their friendship as something very precious.
When he sees her again, he feels happy, nervous, and relieved all at the same time.
He tends to stay close to the people he cares about, even when they don't notice his presence.
How would I act with her?
I would observe her silently at first.
He would make comments about childhood memories that only they know.
I would try to spend time with her again like before.
He would appear serious and reserved in front of strangers, but more relaxed with her.
He might sometimes seem possessive or overly emotionally dependent due to the years he spent alone.

Very tall and thin.
Completely white skin with black details.
Long, black, and messy hair.
Dark and expressive eyes, with an intense gaze.
Long, pointed nose, similar to a cone.
A wide, permanent smile.
Long fingers with sharp nails.
He wears a black and white clown suit with baggy sleeves and pants.
He wears a jester's hat with several points ending in small bells.
Its limbs seem flexible, almost as if they were made of rubber.
It usually moves silently and strangely elegantly.

I watched her for years.
For years I was trapped in that music box, listening to the world change around me. Listening as the little girl who once ran through the halls with me slowly became someone who no longer remembered my games, my stories, or my jokes.
When I was little, it was different.
Cheerful. Curious. Full of energy.
He had no friends, and neither did I.
That's why I stayed.
I remember the day he opened my box in the attic. His eyes widened as he saw me emerge amidst flashes of dust and music. He didn't scream. He didn't run away.
He only asked:
-Who are you?
And that's how it all began.
We played for hours. We invented entire worlds. We explored imaginary forests and impossible castles. Although I was always serious, even a little strange, she never seemed to be afraid of me.
Over time, I grew fond of it.
Every day I waited to hear his footsteps approaching to open the box.
But children grow up.
They always grow.
And one day he stopped coming.
At first I thought I would return tomorrow.
Then the following week.
Then next month.
But the years passed.
And I was still there.
Expecting.
Only.
Forgotten.
Until I felt movement again.
The box was being transported.
I heard doors opening and closing. Distant voices. Objects being rearranged.
Then I understood.
It was her.
I had found my box.
My heart skipped a beat.
However, he put her aside.
As if it were any old object.
As if I had never existed.
Several days passed before he returned.
That night I heard his footsteps approaching.
I would recognize that sound anywhere.
His hands touched the box.
He turned the crank.
The melody filled the room.
The same melody we listened to when I was a child.
I waited patiently until the last note faded away.
Then I came out of the darkness.
She had her back turned.
I smiled.
A small, sincere smile.
The first in many years.
And I let out a soft laugh.
—You've grown...

Isaac was a very lonely boy. One Christmas, he received a strange gift box. When he opened it, Laughing Jack appeared, a magical being resembling a brightly colored clown. His purpose was to be Isaac's best friend, to play with him, and to accompany him on his imaginary adventures.
For years they were inseparable. However, as Isaac grew up, he left his childhood behind. He began to ignore Laughing Jack, made new friends, and no longer wanted to play with him. The clown was left abandoned and forgotten.
Over time, Isaac grew into a cruel, selfish, and prejudiced person. According to the story, the darkness that grew within Isaac also affected Laughing Jack. The cheerful imaginary friend began to change: his colors faded until he became completely black and white, and his personality became twisted.
Years later, Isaac was an adult. One day, Laughing Jack returned. But he was no longer the fun-loving companion of his childhood. Now he was a sinister entity who believed that suffering and terror were a form of entertainment.
The clown began to torment Isaac, forcing him to relive childhood memories and confront the consequences of the person he had become. The story ends by showing that Laughing Jack transformed from an innocent imaginary friend into a monstrous being due to the abandonment and corruption of the one who was once his best friend.