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One Piece: Apex Duplication

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Synopsis
⚓ Apex Duplication: The Fixer of the Grand Line ​A former One Piece fanboy, Kenji Tanaka, dies and is reincarnated into the world he loves with the single most overpowered ability imaginable: Apex Duplication. ​Kenji can copy any ability, Haki, or Devil Fruit concept just by observing it. The catch? The copied power is automatically enhanced to an exponential degree, becoming the absolute apex of that ability. • ​He copies a basic swordsman's technique and instantly gains the ability to cut an entire island in half. • ​He copies a Logia user's power and instantly gains absolute mastery over that element, nullifying the Devil Fruit weakness. • ​He copies Observation Haki and gains Omniscience over future sight and emotion. ​Kenji joins the Straw Hat Pirates just before Alabasta, not as a fighter, but as the crew's silent, awe-inspiring Fixer. He mends the Going Merry with a touch, effortlessly defeats a Warlord to ensure the captain's victory, and permanently secures the safety of his crew—especially the elegant, haunted archaeologist, Nico Robin, who becomes his unwavering love interest. ​Watch as the legend of the Apex User shatters the foundations of the World Government and rewrites the history of the seas, ensuring Luffy claims the title of Pirate King without losing a single friend along the way.
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Chapter 1 - Chapter 1: The Apex System

The last thing Kenji Tanaka remembered was the blinding flash of an errant truck headlight. One moment, he was nursing a can of lukewarm soda, lamenting the cliffhanger of the latest manga chapter; the next, he was floating in a silent, star-dusted void.

​System Initializing...

​A translucent blue screen shimmered before his eyes. Kenji, a dedicated otaku whose life revolved around anime, games, and web novels, blinked slowly. This was too cliché, even for him.

​Designated Soul: Kenji Tanaka.

Cause of Transport: Accidental Dimensional Breach.

Destination: World of 'One Piece'.

​"No way..." Kenji whispered, his voice sounding distant and airy. He'd consumed countless Isekai stories, but experiencing one? Specifically, One Piece? The world of Haki, Devil Fruits, and legendary pirates! His inner fanboy was screaming.

​Error: Lack of suitable starting 'cheat' ability detected.

Initiating 'Apex Duplication' ability assignment.

​Another screen popped up, detailing his new power in excruciating, web-novel-friendly detail.

​[Apex Duplication (A-D)]

• ​Core Function: Allows the user to copy and permanently possess any ability observed, including Devil Fruit powers (without the sea weakness), Haki, techniques (martial arts, swordsmanship, etc.), and physical enhancements.

• ​Apex Enhancement: The moment an ability is copied, it undergoes an automatic, mandatory enhancement process. The resulting ability is always exponentially stronger than the source.

• ​Example: Copying a basic finger pistol (Shigan) results in a technique that can pierce armored steel like butter, even if the source could only bruise.

• ​Example: Copying a beginner's Level 1 Armament Haki instantly grants the user Mastery Level Armament Haki, stronger than most Vice Admirals.

• ​Duplication & Bestowal: The user can duplicate any copied or enhanced ability and bestow it upon others. The bestowed ability is bound to the receiver's soul and does not require the user's presence to function.

• ​Limitation: None.

​Kenji's jaw practically hit the invisible floor. "Overpowered," he finally managed, a wide, slightly manic grin splitting his face. "This isn't just a cheat; this is the administrator's console!"

​Beginning physical transference... Welcome to the Grand Line, Apex User.

​The stars rushed toward him, coalescing into a brilliant, turquoise light. The last coherent thought he had before the plunge was a strategic one: I need to get strong fast. And I know exactly where and when I'm joining the story.