One Piece: My Name is Jack, I'm Very Resistant to Beating

Sea Circle Calendar Year 1516, Onigashima, just after the Fire Festival.

A merchant ship carrying a batch of brand-new equipment docked at Onigashima's port. Over a year had passed, and only now had everything Miss Buckingham Stussy needed finally arrived.

The most valuable cargo on board was this shipment of instruments. Even with the vast resources of the Beasts Pirates, it had taken countless efforts and the assistance of the Donquixote Family to collect them all.

With these advanced instruments in place, and with King personally delivering several high-bounty pirates as test subjects, Miss Buckingham Stussy's research in Wano was set to begin in earnest.

Her laboratory had been established in the desolate region, where Kaido had built numerous research facilities over the past few years, recruiting scientists from various fields. Even Queen had his own lab in this area.

After having several vials of blood drawn by Miss Buckingham Stussy, Jack's already pale face darkened when she pulled out an even larger syringe. His temper flared instantly.

"That's enough! This is going too far!"

Clang!

He smacked the syringe out of her hand, sending it clattering to the floor. Only then did Miss Buckingham Stussy give up on drawing more blood. Jack stood up, his expression filled with disdain.

"If I don't want to give you my blood, you won't get a single drop!"

"What, you trying to settle a personal grudge? Suck me dry?"

"You wanna kill me? You'd have to wait until I get wasted and die of appendicitis!"

"Right, Kaido-san? Kaido-a—"

As Jack turned, he caught sight of Kaido staggering out from a nearby room, looking utterly drained. Dark circles shadowed his eyes, his steps unsteady. Behind him, several middle-aged women looked positively radiant.

Jack immediately shut his mouth.

Supporting Kaido as they left, Jack sighed internally.

Kaido-san, you're ruthless…

Is this what it means for a man to be devoted to his dreams?

Three whole days. I haven't seen you in three days!

"Trân! Go tell them to prepare some kidney tonics! The strongest ones! Kaido-san needs a full recovery!"

"And make sure they're pure! No additives!"

After a few days of rest, Jack—who had only possessed the Suzaku Fruit for a little over a year—was starting to feel restless.

The flames on his body burned in response to his will, allowing him to carry Black Maria and Yamato on his back when needed. But the moment one gains the ability to fly freely, the desire to soar without limits becomes impossible to suppress. Staying confined to the surrounding seas no longer satisfied Jack.

Like Kaido, he wanted to roam wherever he pleased, picking fights and honing his so-called immortality.

After getting Kaido's approval and thoroughly exhausting Black Maria and Yamato in a rigorous training session, Jack grabbed a few Eternal Poses, his gourd of sake, and some seasoning packs before taking to the skies.

For someone at Jack's level, going a month or two without food or water wasn't a problem. While uninhabited islands in the New World were difficult to locate from the sea, from the sky, they were much easier to spot. Most had wild beasts, so there was no need to pack provisions.

Besides, with his mastery of martial arts, Jack could consume massive amounts of food beforehand, storing the nutrients in his muscles for emergencies. He could even extract energy directly from his body to survive.

The sake gourd? Naturally, it was for easy access to water. But more importantly, it was filled with booze—because what's a journey without a few drinks?

Kaido, with his extensive flight experience, had passed down these survival tips. And, knowing Jack wanted to push his regeneration abilities to their limits, Kaido had even selected two ideal opponents for him.

Whitebeard, due to Marco's involvement, had already voiced strong objections to Kaido. Though Kaido and Jack had confronted him over the matter, it was only when fleeing islanders testified that Jack hadn't actually been pillaging that Whitebeard let it slide.

Still, Whitebeard's fury toward Kaido and Jack had only grown. Given their past grudges, Kaido had stopped provoking Whitebeard for the time being, making him an unsuitable opponent.

Instead, Kaido had chosen two different opponents—Shanks and Garp.

Garp needed no explanation. His mastery of Haki and raw physical strength made him the perfect sparring partner for Jack's immortality training.

As for Shanks, despite losing his left arm, he had only grown stronger, defeating countless challengers. In one particular clash with Kaido, the two had fought for half a day without a clear victor.

His growing reputation attracted even more challengers, yet Shanks remained undefeated.

According to Kaido, Shanks' crew was also quite formidable—ideal for Jack's training.

Jack had been eager for a rematch with Shanks. That damn red-haired bastard had left quite the impression on him.

Without hesitation, Jack shot into the sky, speeding toward Shanks' territory.

The unpredictable weather of the New World didn't slow him down. Blazing sun that could roast meat, torrential downpours with thunder and lightning—none of it posed a threat to his body.

Apart from stopping for a day on an uninhabited island to hunt some wild beasts for a meal, Jack maintained his high-speed flight.

As he neared the borders of the New World, he finally arrived at his destination.

A small island, covered in drifting snow.

Below him, a coffin-shaped boat floated on the sea.

A man wearing a wide-brimmed hat and carrying a massive black sword on his back stood at the bow, unfastening his belt.

Despite the freezing cold, he showed no hesitation. Soon, a faint steam rose from where he stood, his face utterly relaxed.

Jack, watching from above, immediately exhaled a stream of flames.

Boom!

Mihawk, in the middle of relieving himself, sensed the incoming danger and swiftly dodged. His urine arced through the air as he landed smoothly on the shore.

But when he looked back and saw his beloved boat engulfed in flames, reduced to floating debris, Mihawk's face twisted with fury. He raised his head and glared at the winged figure hovering above.

"You damned bird! What the hell do you think you're doing?!"

"Why are you attacking me?!"

Jack tilted his head, looking unimpressed.

"I told you before—stop pissing everywhere."

"How have you not learned your lesson yet? No class at all."

"And aren't you a Warlord now?"

"You're still this broke? Can't you buy a proper boat with an actual toilet?"

Hearing that all-too-familiar voice, Mihawk's face darkened. He slowly drew the massive black blade from his back, his tone seething with anger.

"You again… You bastard!"

-----------

The fanfic is Finished on p@treon/tambeerg