
Raised as Kaidou's heir yet captivated by the legend of Kouzuki Oden, Yamato embraced Oden's identity, took up the cause of opening Wano, and turned against his own father. During the Raid on Onigashima he stood with the samurai as one of their fiercest allies.
Yamato towers over an ordinary person at 263 centimeters tall. His long white hair is tied with orange rods into a ponytail that shifts through aqua and then blue toward its tips, ending in the same blocky locks worn by Kaidou. Large orange eyes framed by heavy lashes sit beneath horns that run red along their length and pale toward the base, and gold hoops hang from both ears. His usual outfit pairs a sleeveless white top bearing diamond marks with an indigo wisp-patterned lower half, red hakama, and sandals, finished by a broad purple-and-white nio-dasuki worn across the back in the style of Oden. Earlier, while concealing himself, he kept his features hidden behind a hannya mask topped with a wild blue mane and a long blue goatee.
Devotion to the legendary samurai Oden sits at the heart of who Yamato is. Treating Oden's logbook as a kind of scripture, he openly claims that identity, presents as a man because Oden was one, and calls himself Kaidou's son, all while still answering to his original name. That admiration fuels a dream of sailing out of Wano with the Straw Hats and of throwing the country's borders open in defiance of his father's rule. Decades of imprisonment never broke his will, and he has traded blows and insults with Kaidou repeatedly. Believing Oden would never desert a comrade, Yamato readily places his own body in harm's way, absorbing the Armored Division's artillery to shield Momonosuke and stalling Kaidou alone despite the gulf in their strength, though he also plainly relishes a good fight.
Yamato ranks among the most formidable fighters in Wano. His raw might rivals Kaidou's: a single swing of his heavy kanabo flattened Ulti, and he traded force with Luffy even through Gear 2 and Gear 3. Blistering speed, heavy durability, and great endurance round out his physical gifts. He carries a Mythical Zoan power, the Dog-Dog Fruit in the form of the Okuchi no Makami, a fruit he devoured simply out of hunger that lets him take on a divine-wolf shape and a wolf-human hybrid form, sharpening his predatory instincts and arming him with fangs and claws. The fruit also lets him conjure ice for armor, walls, and a freezing breath strong enough to cancel out Kaidou's flames. Rare among warriors, Yamato commands all three branches of Haki, wielding an advanced infused Supreme King Haki that streams black lightning from his weapon Takeru and could even wound the admiral Ryokugyu.

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Yamato is Kaidou's child, carrying the epithet Oni Princess, but identifies and presents as a man out of devotion to the samurai Kouzuki Oden, whose identity Yamato has taken on.
Kaidou's child Yamato calls himself Kaidou's son, having embraced the identity of Kouzuki Oden and turned against Kaidou's rule to fight for opening Wano.
Yamato turned against Kaidou after being raised as his heir, joined the samurai as one of their fiercest allies, and fought fiercely alongside them during the Raid on Onigashima.
Yamato ate the Inu Inu no Mi, Model: Okuchi no Makami, a Mythical Zoan that grants a divine-wolf form and a wolf-human hybrid form along with the ability to conjure ice for armor, walls, and freezing breath.
Yamato's raw strength rivals Kaidou's, flattening Ulti with a single swing of a kanabo and trading blows with Luffy even through Gear 2 and Gear 3, while also commanding all three types of Haki.
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