He traveled to the world of One Piece and merged with the world's strongest creature to become the new Four Emperors: Kaido, the King of Beasts.

Logically speaking, this is an absolutely high-end time travel, invincible from the start!!!

But when he thought that he had come to the world of One Piece, and as the villain, he was about to face the unreasonable Child of Destiny, Master Joyboy, the user of the Nika Fruit, and the only designated savior: the Sun God.

Kaido felt as if he was invincible.

Sit-ups, version update, and martial spirit awakening!

Is he destined to follow Kaido's old path and become a stepping stone for Luffy to become the emperor?!

Fortunately, you are the child of destiny, and I am a time traveler.

If you have Nika, I can cultivate immortality.

Watch how I, the new Kaido, cultivate my immortality and defeat Nika, and restore order to the pirate world!!!

Traveling through the world of pirates, he replaced Luffy who was not yet born, and gained a gift of incomprehension that defied

the heavens. Since then, Luffy has created all kinds of incomprehension abilities.

"Your incomprehension is incomprehensible. Through visualization and understanding, you have comprehended the exclusive skill - Eight Gates of Ninjutsu."

"Your incomprehension is incomprehensible. Through visualization and understanding, you have comprehended - Conqueror's Haki - Entanglement."

"Your incomprehension is incomprehensible. Through personal visualization and understanding, your transmitter has comprehended the exclusive skill - Top Buddha."

"Your incomprehension is incomprehensible. Through meditation and understanding, you have comprehended the special combination skill - Fifth Gear - Nikayake."

...

In the war on the top, Luffy led the brand new Straw Hat Pirates to participate in the war collectively.

Nikayake Luffy, Ghost Nine Swords Style Zoro, Demonic Wind Leg Sanji, Top Buddha Robin...

When the Straw Hat Pirates appeared, the whole world was shocked...

[Arrived at Raftel at the beginning] [Shanks and Buggy's lifelong enemy] [Black Gun Red Hair Clown King] [Observation Kill + Tyrant + Sea Stone Bullet] [Do Not Move Fruit Ability User] [Supreme Big Pants]...

Throughout his life as a pirate, Oss's achievements are countless, but the real turning point of his fate is the desperate cry in his childhood,

"Kid, why do you have to board our ship?" The man who hid the great secret treasure at the end of the sea, the Pirate King Gol D. Roger smiled and asked Oss in front of him,

"Hahahahaha... Of course it's to turn the world upside down!"

After boarding the ship, Roger was shocked to find that he seemed to have another monster-like kid crew member, whose

strange power far exceeded that of the giants? Born with awakened observation Haki!...

(Family style + Devil Fruit + Domineering system + Lord farming)

Yuanqi Continent, a magical world with thousands of races.

Zekai, who was unexpectedly reborn, became a member of the Wilson family, but became a shame in the eyes of the family because he was unable to absorb vital energy.

At the age of eighteen, during his coming-of-age ceremony, when Zekai failed in his final awakening, he became a complete waste in the eyes of the people, was stripped of the Wilson family name, and was kicked out of the family.

Little do they know that Zekai, who is seen as a waste by everyone and cannot absorb vital energy, carries the Pirate World System, possesses the blood of a hegemon, and can practice the three colors of hegemony in the One Piece world.

In addition to the bloodline of the overlord, the system also brings various magical items from the pirate world, such as large swords, pure gold, and... devil fruits.

After leaving the Wilson family, Zekai changed his surname to his mother's. From then on, there was only Rocks Zekai in the world!

In a small coastal town, the Rocks family began to rise. Starting from scratch, they gradually built a super empire that unified the Yuanqi Continent...

[Sniper][Great Swordsman][Demon Sword][Mythical Beast Species Garuda Fruit][Hot-blooded][Decisive Killer][Pervert][Independent Storyline Original Plot][Currently: Kalifa, Alpha, Empress, Lady Shirley, etc...]

The West Sea is a sea area ruled by gangs, but it also has countless powerful pirates.

Ever since Andy got the bounty point system, the guys with bounties in this sea area became his targets!

Ghost Assassin Moon, Enchantress Luna Meiyan, Bonebreaker Bruno, Flame Fist Royce, Mad Axe Tobias, these long-famous pirates in the West Sea have all been defeated by Andy!

But this is just the beginning!

Killing pirates was no longer enough for Andy, so he teamed up with the richest man in the ocean and began to offer rewards to the navy and the Celestial Dragons. Thus, the terrifying God Killer was born!

Besides killing, the protagonist also has some tenderness, is passionate, and may also do some treacherous things...

If there are any bad parts in the writing, please tell me in the comment section. I can see it in the background and make reasonable changes.

P.S.: There's no justice in this book. Regardless of whether they're pirates or navy, they're all treated as pirates. As long as there's a bounty, the protagonist will kill them all, pirates or navy alike. Anyone who provokes him will be killed! It doesn't matter if the other party is guilty or not! If you mind... forget it, mind it!

Ryan was reborn in the world of One Piece. His parents are unknown. He was picked up and adopted by an old man. Fortunately, he was born with Observation Haki. The most important thing is that Ryan is also bound to a god-level cooking system. The cooking levels are divided into general, fine, excellent, top, master, unparalleled, and god-level. He even conquered Rocks with his cooking skills. In order to upgrade his cooking skills, Ryan joined the Rocks Pirates. When Whitebeard, Golden Lion, Kaido, Big Mom... these legendary pirates boarded the ship one by one, they found that this pirate group was really a paradise for gourmets. Ryan, as a cook, became the vice-captain of the Rocks Pirates. ... Steel Bone Sora: "If Ryan, this guy, wasn't a cook, his bounty would probably be higher than Rocks!" Garp: "Sooner or later, I will capture this guy Ryan and bring him to the Navy Headquarters to be a cook!" Protagonist: Ryan

[Original Nature-Type Popo Fruit] [Veteran of the Roger Pirates] [Gold, Silver, Bronze, and Iron] [Supreme Orange Juice] [The First User of the Face Fruit]…

As a witness and firsthand experience of both the old and new eras, Kyle’s achievements are countless, but when it comes to turning points in his life, he can’t help but recall an afternoon when he was six years old.

“A… Ace?!”

No, no!

Sorry, sir, I didn’t recognize you just now!

This is clearly Ace’s father—young Gol D. Roger!

“Little Kyle, I’ve taken a fancy to you! Are you interested in going out to sea with us? Let’s see what the ocean really looks like!”

The legendary succubus unleashed her power, and the only thing she could hold back was this↑

…

Decades later, during the Battle of Marineford, a mature, middle-aged handsome uncle descended from the sky.

“Ah, Mina-san, excuse me, it’s time for my naughty nephew to go home for dinner!”

Luo An was reborn in the world of One Piece, born with the Haki of Armament, and was also bound to a divine doctor system.

The medical skills are divided into ordinary, profound, top, master, extraordinary, and god-level.

After each treatment, in addition to the experience points, a medical skill blind box that only Luo An can see will be randomly dropped.

Trauma treatment encyclopedia, golden wound medicine, scalpel, encyclopedia of medicinal materials…

…

Whitebeard: “Luo An, that guy, can actually heal my body, but there is no ship that can carry me in this era.”

Red Hair: “I bet this arm on the new world… But Luo An not only cured me, but also gave me a unicorn arm!”

[At the age of eighteen, just debuted as a pirate, you met the current overlord of the sea in the pirate world, Rocks D. Zibek. Now what you have to do is to find a way to survive in his hands. 】

After traveling back to the pirate world for seventy years, the great pirate Monger, who was ready to retire, looked at his system that was seventy years late.

And the intern in front of him who just turned twenty, hasn't even learned how to be domineering yet, and is working diligently on his own ship.

Reach out your hand.

Bang!

"Captain, what are you doing!?"

"Nothing, I just want to beat you up."

[Ding~, congratulations on defeating the overlord of the sea, Rocks D. Gibeck! 】

...

This book is also known as - "As a Pirate, You Get Younger and Younger"

"How Can You Lose When All the Crew Are Royal-Class? 》

Become...

At the beginning, Ron traveled through the pirate world and broke into Im's daughter's body. He was killed instantly, reborn in Windmill Village, and awakened the pirate main system!

Ability to overcome the sky: As long as the target meets the subsystem binding, the subsystem can be distributed to the target? The rewards obtained by the subsystem are returned tenfold!

Ron: Okay, now it's time to have some fun.

Sabo's strongest krypton gold system, Ace's strongest punch-in system!

Distribute the [God-level Selection System] to Luffy.

Luffy: System, if I knock him away I can have meat, right?

Distribute the [Strongest Pretending and Slapping System] to Usopp.

Usopp: I have eight thousand subordinates, tens of thousands of younger brothers, and admirers all over the East China Sea!

Distribute the [God-level Sleeping System] to Zoro.

Zoro: You want to fight? Let me take a nap first, and watch me dream three thousand times!

Give Sanji the [God-level Beating System].

Sanji: If we're brothers, come and kill me!

Distribute the [Most Powerful Treasure Hunting System] to Nami, and she actually dug through the underworld with just one shovel? !

Distribute to Chopper【.....】

Until everyone in the Straw Hat Pirates had a system, the entire pirate world changed!

.....

Kaido: What? The strongest creature in the world? Every member of the Straw Hat Pirates is the strongest creature!

Sengoku: Garp, this is what you call adventure? Your grandson is going to grab the gold from the sky!

Hawkeye: Zoro is a gifted kid. He can master my swordsmanship at first sight!

Five Elder Stars: When did the Straw Hat Pirates become the Ten Emperors? Captain Ron, the Emperor?!

..........