Kahn was a transmigrator, and an extraordinarily lucky one.
In his previous life he worked as a translator fluent in three languages.
One morning he woke up as an infant in the world of pirates.
Kahn did not panic in the slightest.
The moment he opened his eyes, he could hear the thoughts of his parents in this life.
When touched, he could read memories.
With that ability he understood he had crossed into the world of One Piece.
It was an innate Observation Haki rarer than Conqueror's Haki.
Like Kozuki Oden, Kahn possessed inborn strength even as a newborn, strength enough to fling a nurse.
At five years old he could shatter rock with one punch, level a house, and his skin ignored assassins' bullets.
Kahn knew his physique was like Charlotte Linlin's, destined to become a natural destroyer, the strongest shield even the Celestial Dragons and the CP organizations would covet in a navy admiral.
Born with templates of the Red Count and Charlotte Linlin, and with a grown man's soul from another world, Kahn understood that in the West Blue nothing could threaten him. He naturally displayed precocity and power.
By deliberately showing his talent, the boy born into a mafia family quickly earned the title of monster by nature.
His ambitious father saw Kahn as the hope to dominate the West Blue.
After witnessing Kahn's herculean strength and his body's resistance to blades and bullets, his father had him take over family business at six.
Kahn did not disappoint. With innate Observation Haki and the natural destroyer's physique, he pushed the Cross Family from a small gang to one of the largest powers in the West Blue.
That meteoric rise indirectly led to the deaths of his parents in this life.
Remnants of forces crushed by the Cross Family could do nothing to Kahn's impervious body, so they turned their knives on his father and on the couple Valli, as Ken called them.
When Kahn was nine, while out negotiating a deal, the Valli couple were murdered by a pirate crew for hire.
Their deaths triggered Kahn's metamorphosis. From that day he felt no mercy for the natives of this world.
Any enemy of the Cross Family would be left with no survivors.
The monster by nature now had no weak points.
During that metamorphosis Kahn awakened the king's disposition that appears in one among a million, Conqueror's Haki.
Awakening Conqueror's Haki at nine put him ahead of almost everyone in the pirate world before the final saga began. Only Donquixote Doflamingo and Yamato awakened earlier. Charlotte Katakuri and Portgas D. Ace both awakened at ten.
In the year after awakening Conqueror's Haki, Kahn received an epic enhancement.
Though his height lacked the inhuman extremes of Charlotte Linlin, his appetite was every bit her equal.
He could clear a table in an instant like Luffy.
Then came a lesson.
In one breath he emptied a basket of fruit and accidentally ate a Devil Fruit.
For a long time after, Kahn felt a lingering fear. If the basket had held not one Devil Fruit but two, he would have died on the spot.
From then on he abandoned wolfing down food and returned to normal eating habits from his previous life.
Misfortune turned to blessing. The accidental Devil Fruit proved rarer than a Logia, a Mythical Zoan.
Its full name was Zoan, Dragon-Dragon Fruit, Mythical Model, Heavenly Dragon.
It was the Dragon-Dragon Fruit, not the Fish-Fish Fruit.
That difference meant Kahn's dragon form was not the cloud-riding eastern dragon of Kaido or Momonosuke, but a western dragon with wings.
What separates a Mythical Zoan from the ordinary and the ancient breeds.
Ordinary and ancient models turn you into common or rare animals, they are still animals.
Mythical Zoans are legendary beings. In addition to the mythic body, they grant a supernatural power.
What powers a Heavenly Dragon has in its own myths Kahn did not know.
Yet after eating the Mythical Model Heavenly Dragon, he gained a formidable power.
Telekinesis.
With telekinesis, Kahn could control wind like Tatsumaki and Fubuki from One Punch Man, command lightning, churn the sea, and make objects float.
With talents maxed out, from age ten Kahn stood where countless people could never reach in a lifetime.
Barring special powers, advanced Armament applications, or Conqueror's infusion, no one could use physical attacks to break his defense.
Once transformed, Kahn could whip up hurricanes and heave the sea, a Walking Calamity.
From ten to fifteen he transformed into a dragon only twice.
The second time was today.
The first time was last year, when he destroyed five warships and annihilated the Marines and CP agents who tried to abduct him and his personal maid to Mary Geoise.
No one learned of that event, but afterward the Marines issued a second bounty on Kahn, raising it to three hundred million Beli, a record for the West Blue.
Before Kahn, in the West Blue and even across all Four Seas, no one had ever received such an outrageous bounty before entering the Grand Line.
In Sea Circle Calendar 1520, among the Worst Generation, setting aside Blackbeard who joined later, only Luffy and Kid exceeded three hundred million as Supernovas.
Measured against the Supernovas a dozen years later, Kahn's bounty would rank in the top three.
In this era, no matter which year he entered the Grand Line, he would be the number one Supernova of his class.
When the Marines set that bounty last year, Kahn shocked the world.
Ace shook the world in the first half of the Grand Line without ever entering the New World.
Kahn surpassed that. He shook the world without even entering the Grand Line.
When every faction began investigating him, they fell silent.
That included the Marines and the CP organizations.
If it were anyone else, daring to wipe out five warships and masses of Marines and agents, the World Government and Marine Headquarters would have launched a Buster Call.
Yet from last year to now, the Marines and CP ceased their harassment.
Though his territories crawled with undercover agents planted by CP, neither Marines nor CP dared to wage war on Kahn.
A natural destroyer like Charlotte Linlin who ate a Mythical Zoan, what does that imply.
Every Devil Fruit draws on stamina.
In this analogy, stamina in One Piece equals chakra in the Naruto world.
The natural destroyer's physique is akin to the Sage Body, born with a massive reserve.
If a Mythical Zoan's supernatural power counts as a forbidden art, then Kahn, who possesses that vast reserve like Naruto Uzumaki, can use such arts as easily as eating a meal.
Others need to grow, Kahn does not.
Against a flying monster that can hurl hurricanes with telekinesis and roll the seas, unless an admiral is dispatched, sending more troops only raises the body count for nothing.
Even an admiral might fail to catch a Heavenly Dragon that can fly.
In this era the admirals are Zephyr and Sengoku.
The future three admirals are still only vice admirals.
Thus, although Kahn became an immense threat, the Marines and CP did not dare to move against him.
All they uncovered was that Kahn had a physique like Charlotte Linlin's and had eaten a Mythical Zoan rarer than Logia.
They did not know that beyond the templates of Charlotte Linlin and Kaido, Kahn also carried the Red Count's template and possessed innate Observation Haki.
Blended with telekinesis, that innate Observation Haki rose to a unique tier like Enel's.
Beyond hurricanes and tidal waves, Kahn hid even stronger trump cards.
Without ever entering the Grand Line, he had become a monster that gave the overlords of the sea a splitting headache.