Yamato is the daughter of Kaido of the Four Emperors and self-proclaims to be "Kozuki Oden". This profound admiration for the legendary samurai has led to the decision to embody everything related to the samurai to the extent of proclaiming to be a man as well, and hence Yamato is widely referred to as Kaido's son. Yamato is tall, being slightly over twice Luffy's height but not nearly as tall as Kaido. Yamato has long, white hair that is bound between orange rods into a ponytail at the back, which fades into aqua green and then blue the further down it goes, and ends in rectangular locks similar to Kaido. Yamato also has large, orange eyes with prominent eyelashes, and wears gold hoop earrings on both ears and has red horns. Clothing-wise, Yamato wears a pair of red hakama pants and sandals, and, much like Oden, wears a large purple and white nio-daisuki behind the back.
Yamato's current outfit is a sleeveless white garment with a diamond-shaped design on both sides and an indigo, wisp-patterned bottom half. This garment was originally a sleeved kimono with long white sleeves, but these were later ripped off, leaving the garment sleeveless and making it more form-fitting. Also, while in disguise, Yamato originally also wore a hannya mask, which has a blue wig with an extremely long and wild mane attached to the top and a long blue goatee attached to the bottom.
Yamato's teeth are typically normally-shaped, but can transform into fangs. Whether this is a natural or Devil Fruit-related ability remains unknown.
Around four years ago, Yamato wore a similar long-sleeved outfit, but with different symbols on the breast area. The symbols resemble an oden skewer.
At age 8, Yamato's outfit was nearly identical to today, except with a slightly different mask with shorter horns and beard and without the nio-daisuki. In the manga, Yamato's outfit lacked the diamond-shaped design. Yamato holds immense admiration for the legendary samurai Kozuki Oden, emulating every aspect of him, including his name, appearance, goals, and even his gender, reasoning that, since Oden was a man, then it was also necessary to become a man. Yamato wishes to fulfill Oden's dream of reopening the borders of Wano Country. Due to this admiration of Oden, Yamato often does things and considers certain actions based on assuming the identity of Oden himself. This led to Yamato being considered delusional by Luffy, Ulti, Shinobu, and Momonosuke. Yamato is a very powerful warrior, with Black Maria noting that bringing Yamato back to Kaido's fortress after having escaped would be a difficult task. In the past, Yamato was able to clash against Ace, a powerful Logia user, on equal ground. Yamato possesses monstrous strength resembling that of Kaido, being capable of wielding a large and heavy kanabo and using it to knock out Ulti, an Ancient Zoan user and one of the Tobiroppo, with just one blow. Yamato was also able to physically match Luffy's strength with relative ease, even when the pirate increased his strength exponentially with Gear Second and Gear Third. When Yamato countered a punch from Luffy with a kick, the powerful collision destroyed much of the surrounding wall and ceiling and blew back the Beasts Pirates around them. Luffy was even easily picked up and held with just one arm while running due to Yamato's stature. Yamato was later able to shatter the extremely tough armor and weaponry of the Beasts Pirates' Armored Corps with great ease.
Yamato is quite fast, being able to lunge forward with blinding speed to attack, as well as outrun members of the Beasts Pirates in pursuit, and eventually completely elude the pirates and escape to the attic with Luffy without anyone seeing them. Yamato also possesses tremendous durability, having emerged from being struck by multiple explosive bazooka blasts with only superficial bruises and cuts, though eventually began taking more serious wounds as the bazooka strikes continued. Yamato wields a giant kanabo club much like Kaido, albeit studded and more slender, while Kaido's is spiked and a bit thicker. Coupled with Yamato's immense strength, the kanabo can wreak tremendous damage to objects and opponents with a single hit, and with Yamato's strength and Haki, it can be used to perform flying strikes that can even resemble energy blasts. In addition to the kanabo being a powerful blunt weapon, Yamato has masterful technique with it, being capable of moving it to counter Luffy's rapid attacks with little effort.
