One Piece: Marine Luffy, Garp regrets it

Just as Luffy had predicted, Kaido's jaw nearly dropped to the ground in shock at the implications of the Vice Admiral's statement.

"No," the Emperor sputtered, visibly struggling to process this information. "Is this still the New World? What did your lightning do to me?!"

Kaido would sooner believe that he had been struck dead by lightning and ascended to heaven than accept that Yamato had not only fallen in love with someone but had become a Marine's wife—especially the very Marine who had humiliated him and stolen his territory.

After a prolonged silence during which his mind raced through various scenarios—all of them preferable to the reality before him—Kaido finally regained his composure.

He regarded Yamato with a complicated expression, a mixture of parental concern, bewilderment, and underlying anger swirling in his eyes. But then his gaze hardened, returning to the implacable determination that had made him feared across the seas.

"Yamato," he began, his voice uncharacteristically measured. "When you were captured by the Marines before, I gave you a chance to return to us. I hoped you would come to your senses and return willingly."

He straightened to his full intimidating height, the massive horns atop his head seeming to scrape the sky itself. "Now, I'll offer you one final opportunity—come back with me. As long as you abandon this foolishness..." His voice faltered momentarily before continuing, "As long as you stop claiming to be Kozuki Oden, I will still reserve your position as Governor of the Beast Pirates."

When her father mentioned her previous obsession with Kozuki Oden, Yamato's face flushed crimson with embarrassment. That chapter of her life—when she had blindly worshipped and imitated the samurai—now seemed like a distant, childish phase she had outgrown.

"Idiot!" she snapped, the familiar hostility returning to her voice. "I don't care about Kozuki Oden or any of that nonsense anymore! Don't mention him in front of me—I am Yamato now, and I will only be Yamato!"

Kaido's eyes widened with surprise and a glimmer of hope. After decades of frustration over his child's identity crisis, hearing Yamato finally accept her own name caused an unexpected surge of paternal satisfaction. Perhaps, he thought, his daughter had finally matured beyond her childish fixations.

But Yamato's next words extinguished that hope as quickly as it had ignited.

"Give up on your delusions," she declared firmly. "I won't return with you. I have my own dreams now—I want to help Luffy become a Marine Admiral, and someday, I aim to become one myself!"

"You ungrateful brat!" Kaido roared, his patience finally shattering. "You always side with outsiders! Can't you show even the slightest consideration for your own father?!"

This rare display of emotional vulnerability from Kaido revealed the genuine pain beneath his fearsome exterior. Yamato was indeed his biological daughter, yet throughout her life, she had consistently opposed him because of her admiration for two men: first Kozuki Oden and now Monkey D. Luffy.

Coincidentally, both of these individuals had not only defied Kaido but had inflicted physical and psychological wounds that still burned. The samurai had scarred him during their legendary battle, while the young Marine had humiliated him and driven him from Wano.

Kaido's mind flashed through the tumultuous history with his daughter. Yamato had been a typical little girl briefly in her earliest years, but soon began showing signs of rebellion.

At the age of eight, she had been captivated by stories of Wano's samurai—particularly Oden—and had fallen into what Kaido considered mindless hero-worship. Now, just when she had finally outgrown that phase and Kaido thought he might experience some semblance of normal father-daughter relationship, another figure had appeared and completely led her down a path of continued opposition to him.

"Was Yamato born specifically to oppose me?" Kaido thought bitterly. "Is this some cruel joke of fate?"

As these painful reflections swirled through his mind, Kaido's remaining patience evaporated. He was finished with conversation. With a furious growl, he hefted his massive kanabo, determined to teach his disrespectful daughter a lesson she wouldn't forget.

Yamato met his challenge without hesitation. Gripping her smaller version of the kanabo with both hands, she lunged forward with explosive speed, moving like an arrow released from a bow.

Her weapon gleamed with the blackened sheen of advanced Armament Haki, specifically employing the internal destruction technique that could damage opponents from within. The kanabo crashed against Kaido's defense with tremendous force.

Kaido's eyes narrowed with ferocious intensity. He stomped his left foot heavily into the ground, anchoring himself against the impact. Simultaneously, he gathered his immense strength into his right arm, swinging Hassaikai upward in a diagonal arc. His weapon, similarly coated with potent Armament Haki, collided with Yamato's kanabo with earth-shattering force.

As their weapons connected, both father and daughter glanced briefly at the uninhabited island beneath them—a landmass Luffy had strategically pulled from nearby waters to serve as their battleground. Kaido wondered if this small island could withstand the destruction their confrontation would inevitably cause.

"Thunder Bagua!" they shouted in unison, each executing the signature technique that had been passed from father to daughter.

In that instant, the ground beneath their feet began to fracture, spreading outward in a spider-web pattern from the point of impact. The terrifying shockwave generated by their clash sent debris and dust billowing in all directions.

Luffy calmly raised his hand, using his own Haki to disperse the approaching wave of dust and pressure.

"Luffy," Koala stepped forward, concern evident in her voice as she observed the unfolding battle. "Shouldn't we intervene? Yamato can't possibly be a match for Kaido on her own."

Luffy watched as Yamato continued to exchange blows with her father, noting how she was gradually being forced onto the defensive despite her impressive showing. A knowing smile played across his lips.

"Yamato is naturally no match for Kaido at full strength," he acknowledged. "But she's been suppressing these feelings for so long. If we don't allow her this opportunity to confront him directly, we'll all suffer from her frustration later."

He turned to address the two least combat-oriented members of their team. "Viola, Mansherry—stay well back and remain behind us for protection. When Yamato reaches her limit, Mansherry, your healing abilities will be essential to restore her strength."

The tiny fairy princess nodded solemnly, her wings fluttering with nervous energy.

"Viola," Luffy continued, "focus on being our photographer. Capture clear images of our combat with the Emperor—these will serve as evidence of our victory over one of the Four Emperors. Your promotion might depend on the quality of these records."

The two women nodded in understanding. Viola, the princess of Dressrosa, made an affirmative gesture before positioning her Visual Den Den Mushi at a safe distance. With her Glare-Glare Fruit abilities, she could observe and record the battle from multiple angles simultaneously, creating a comprehensive record of their engagement with the Emperor.

Satisfied with these arrangements, Luffy turned his attention back to the ongoing battle. He had already formulated a strategy: after Yamato had exhausted herself against her father, Hancock, Koala, and Vice Admiral Gion would take turns engaging Kaido, each showcasing their unique fighting styles and abilities.

This approach would serve multiple purposes—wearing down the Emperor gradually, gathering intelligence on his current capabilities, and creating a record of coordinated Marine tactics against a Yonko-level threat.

Only after these preliminary engagements would Luffy himself step forward for the final confrontation. His primary objective extended beyond mere victory—he intended to study Kaido's masterful use of Conqueror's Haki during their battle, hoping to overcome his own plateau by learning from the Emperor's techniques.

Honestly what he want is to copy Luffy from the Original canon and have Kaido-sensei help him be stronger.

If he had traveled thousands of miles for this confrontation, Luffy was determined to extract every possible benefit from it.