One Piece: The Demon

Sebastian scratched his head, lost in thought about the sudden and dramatic change in his life. Just ten minutes ago, he was comfortably enjoying Gloria's glorious boobs on the bed, and now, here he was in a whole new world—a nautical world filled with pirates, marines, the world government, Celestial Dragons, and the revolutionary army, all entangled in a complex web of power and intrigue.

The allure of this world might have seemed exciting when viewed through the lens of an anime, with Luffy boldly defeating foes on his journey to find the One Piece. But as the story unfolded, the seemingly passionate sailing adventure began to taste different. Pirates, in this reality, were not romanticized heroes; they were often ruthless, burning, killing, and looting, committing all sorts of heinous acts. True freedom-seeking pirates were few and far between.

The marines, who represented justice, were not entirely pure in their intentions. Some labeled them as mere lackeys of the Celestial Dragons, while others argued they maintained order in the seas. Opinions were divided.

As for the revolutionary army, they appeared righteous on the surface, but their efforts often seemed futile. Stirring up a country's dissent against the World Government only led to their quick withdrawal, leaving the hapless nation to suffer the World Government's oppressive might.

Time had passed, and the revolutionary army had yet to make significant headway. Meanwhile, the World Government was rotten to the core, with the Celestial Dragons arrogantly believing themselves to be divine and superior.

Luffy, the symbol of righteous pirates, began as an adventurous spirit. However, as the need to save his brother Ace grew dire, he transformed from an adventurer into a true pirate. He was responsible for releasing countless dangerous inmates from Impel Down, indirectly causing more deaths than some of the notorious Four Emperors' crews.

Traveling to such a perilous world, where life was constantly on the line, was a headache-inducing prospect for Sebastian. The previous owner of this body had set sail in search of treasure but, through a twist of fate, became a member of the Beasts Pirates.

"Beasts Pirates," Sebastian muttered, reflecting on his circumstances. "Thank goodness it's not Big Mom's Pirates. While the environment here may not be as comfortable as the Whitebeard Pirates or Red Hair Pirates, it does have its advantages."

Kaido, the leader of the Beasts Pirates, only cared about strength, disregarding a person's age. If one's strength was sufficient, they could attain the status and power they deserved. As Sebastian ruminated, a flurry of news regarding the Four Emperors raced through his mind.

Suddenly, memories from a previous life surged to the forefront, leaving Sebastian stunned. There were now only three Emperors in the seas. Red-Haired Shanks had not yet ascended to the status of an Emperor.

That meant there were still a few years before Luffy embarked on his journey. And in the world of pirates, a few years was indeed a short span of time. Luffy, the protagonist, enjoyed the fortune of luck and swift progression that ordinary people couldn't dream of achieving.

Kaido had knocked down Luffy multiple times, but each time, Luffy stood up again, his resilience unwavering. The first defeat led to Luffy's understanding of Armament Haki Emission. The second defeat brought forth his mastery of Conqueror's Haki entanglement, a skill only the sea's elite could wield. And, after the third defeat, Luffy awakened his Devil Fruit, an astounding transformation—his Paramecia Rubber Fruit morphed into a mythical Zoan, the mighty Nica form.

With the power of a sun god, Luffy was prepared to take on Kaido and rewrite the course of their epic confrontation.

The scene was no less astonishing to Sebastian in his previous life. He could understand the concept of plot amour. However, Luffy's actions were an entirely new twist, effectively overturning the established conventions.

Mythical creatures possessed extraordinary abilities. Kaido's Yuyu fruit transformed him into a dragon with the power to control the elements of wind and fire. 

But what set Luffy apart was his Zoan-Nica form. Initially, it lacked any Zoan characteristics, in stark contrast to other devil fruit species that could transform. It appeared identical to the Rubber Fruit.

After awakening the fruit's true potential, it transformed into a Mythical beast. This set Luffy apart from all others. One might say it was the protagonist's aura or Luffy's sheer willpower that forced this unique transformation.

Reflecting on Enel's fate, crushed to death by rubber, and realizing that Luffy wasn't a rubber man but a Zoan-Nika man, Sebastian couldn't help but chuckle. Perhaps the most amusing twist was Ace sacrificing himself to shield Luffy, the sun god, during the Summit War. If Ace were to learn of Luffy's newfound status as the sun god, would he come back from the afterlife?

"Being part of the group of beasts, I'll inevitably cross paths with Luffy sooner or later. It's far too perilous to confront a protagonist who can forcibly transform into a Mythical beast from a Paramecia," Sebastian mused.

"Ah, if only I were a Mythical beast," he sighed. Yet, he couldn't help but consider that Zoans were even rarer than Logia fruits. With the exception of the fruit that Chopper had consumed, there was little else to choose from.

Regrettably, he had already consumed a Devil Fruit – the most ordinary Zoan fruit with a bat form. It wasn't an ancient species or a Vampire form; just a plain, everyday bat. The kind you'd find in any dark cave.

This fruit choice had landed him in the Beasts Pirates, as Kaido had a penchant for Zoan ability users and aimed to assemble a formidable army of them. He believed Zoan fruits were the most powerful.

However, just when Sebastian was contemplating his unfulfilled desire to become a Mythical beast, something extraordinary happened.

[Ding] 

[The host's strong desire for Mythical Zoan has been detected! Now, bind the system!]

[The binding is successful! Congratulations to the host for becoming the only host in the system!]

Sebastian's joy knew no bounds as he realized he had awakened a mysterious system.

"System! What's your purpose?" he inquired.

[In response to the host, the system can help you modify Devil Fruits! You can change any Devil Fruit into a Mythical Zoan fruit!] 

[The specific type cannot be chosen; it will be influenced by the original fruit, resulting in a similar Mythical Zoan fruit.]

[Modifying fruits requires modification points, and modification points can be earned by increasing your reputation!]

Sebastian grasped the system's capabilities. First, it could transform ordinary devil fruits into a Mythical Zoan type.

Second, it wasn't limited to modifying his own Devil Fruit – he could modify others' Devil Fruits as well. Those whose Devil Fruits were modified would become 100% loyal to Sebastian, willing to sacrifice themselves if necessary. 

Third, Sebastian could extract talents or abilities from the modified individuals. 

Fourth, there was a wide range of Mythical Zoans to choose from, including mythical creatures or powerful beings from the anime he watched in his previous life.