The last demon in the One Piece world

Chapter 1: An unexpected visit

Before i start this chapter i just wanted to say that Yushiro's appearance will look like a young teenager's. (13-14 yo)
Also, this is my first time writing a fanfiction and english is not my first language. So, if there's something i should fix or correct please let me know.
I don't own one piece or demon slayer. Demon Slayer is owned by Koyoharu Gotouge and One piece is owned by the goat Eiichiro Oda.
Well...Let's start!!!

There had been whispers and rumors circulating in a nearby village adjacent to the Windmill one—stories of a peculiar, pale teenage boy who had supposedly lived there for over a century without showing a single sign of aging. The townsfolk whispered in hushed tones, speculating wildly: some believed he was an immortal, others thought he might be some sort of monster, or perhaps a demon lurking in human form. The common thread in these tales was that anyone daring enough to go and see him returned looking ghostly pale, eyes wide with terror, as if they'd glimpsed something beyond mortal comprehension. Their faces often haunted with the memory of that fear, and their bodies drained of color, as if the very sight of him was enough to drain their life force.

These rumors didn't go unnoticed—not by the local authorities, nor by those with a nose for strange happenings. Among them was Vice-Admiral Garp of the Marines, a man known for his hearty spirit and insatiable curiosity. Hearing of this mysterious boy, Garp couldn't resist the urge to investigate for himself. He was intrigued, perhaps even a little skeptical, but mostly curious about whether such an immortal existence could truly be real.

On a bright, breezy day, Garp arrived at a modest, quaint house nestled on the outskirts of the village. It looked cozy, almost inviting, with a small garden blooming with wildflowers and a gently swinging sign that read "Home." The house had a warm, lived-in feel—wooden beams slightly weathered, smoke curling lazily from the chimney.

Standing before the door, Garp rubbed his chin thoughtfully. His broad shoulders and muscular build made him seem imposing, but his expression was open, eager.

"Hmm," he muttered to himself, voice rumbling with curiosity. "Well... it probably won't hurt to see for myself. I wonder what kind of person he is..."

With a determined nod, Garp raised his hand and knocked firmly on the wooden door. The sound echoed softly into the quiet air. He waited patiently, anticipation flickering in his eyes, until he heard footsteps approaching from inside. The steps grew louder—deliberate, hesitant—and then faster, as if whoever was inside was nervous or wary.

Suddenly, a loud *screech* echoed from inside, startling Garp slightly. The door swung open abruptly.

A teenage boy stood before him, no older than 14, with an aura that felt both enigmatic and slightly intimidating. His skin was unnaturally pale, giving him a ghostly appearance that contrasted sharply with his dark, lavender eyes that shimmered with an unsettling depth. His hair was styled in a short, tidy cut with bangs that curved gracefully to the side, the color shading from a pale green at the roots to a deep black at the tips—a striking, almost otherworldly gradient.

He wore a neat button-up shirt, its fabric crisp and well-kept, partially covered by a traditional white kimono that draped lightly over his shoulders. His navy-colored pants fit snugly, completing his simple but distinctive outfit.

Garp took a step back, momentarily surprised by the boy's appearance and the intensity of his gaze. His initial reaction was a mixture of wariness and curiosity. Despite the boy's somewhat menacing tone, Garp's hearty demeanor quickly reasserted itself, and he maintained a calm, friendly expression.