Since the original penning of this article, the manga has provided us with a definite answer. Yamato is a trans man and uses “he/him” pronouns. The answers came to us via a fateful trip to the onsen, or hot springs.
In One Piece Chapter 984, "My Bible," it was revealed that Yamato is a woman who calls herself a man to mimic her idol, Oden Kozuki.
Introduced during the Wano Country arc, Yamato was born as the daughter of Emperor Kaido. However, due to their strong admiration for the samurai, Kozuki Oden, Yamato verbally identifies as male throughout the series.
After Kozuki Oden's death, Yamato made the decision to take on Oden's character, imitating him and picking up his mannerisms. She made the decision to “become” a man and identify as Kaidou's son out of her desire to become Oden, causing Kaidou and his crew to also refer to Yamato as male.
Yamato doesn't have a traditional male body, that much is true. Regardless, he still identifies himself as a man, because that is what he corresponds with. Yamato wants to be male because Kozuki Oden was male.
Ace got Yamato pregnant and in order for the baby to survive Yamato has to hold the baby for 2 years and it has already been 2 years and when Luffy kills kaido she will give birth.
The Vivre card states that Yamato is canonically female, contrary to the majority view of One Piece fans. On the other hand, since Yamato is female, a possible reason for this occurrence is that Kaido wants Yamato to claim the male-only title of Shogun in the Wano Kingdom. Hence, the reference as a male character.
Who is Ace's girlfriend in One Piece? Moda is a milk maiden that Ace met during his cover story. She is the daughter of Koda and Kyuji.
Despite all the build up, Yamato ended up not joining the Straw Hat Pirates and here's why. The Straw Hat Pirates are a powerful bunch that hail from the East Blue and are led by the protagonist of One Piece, Monkey D. Luffy.
The two, along with other members of the Ninja-Pirate-Mink-Samurai alliance helped liberate Wano. Whilst Luffy had no idea who Yamato was, Yamato knew of Luffy and had developed a huge interest in him after hearing Ace's storues.
Yamato Takeru went to the eastern land. He lost his wife Oto tachibana-hime during a storm when she sacrificed herself to soothe the anger of the sea god.
Who did Yamato marry? Yamato Takeru's Wife Tachibana-hime Calms the Storm by Jumping into the Sea at Kazusa Bay.
In Volume 11 Chapter 72, Yamato and Mei eventually got married (which now makes her Mei Kurosawa) and he becomes the father to a baby boy named Ken Kurosawa.
Since the original penning of this article, the manga has provided us with a definite answer. Yamato is a trans man and uses “he/him” pronouns.
Yamato would love to listen to Ace's stories all night long. Sadly, she never got a chance to sail with him. Their relationship is the perfect mixture of heartwarming, funny, and sad. It's the main reason why Yamato has grown attached to Luffy, considering he is Ace's sworn brother.
Yamato is a rather tall 28-year-old young individual, being twice Luffy's height. Yamato has long white hair tied into a ponytail using orange rods. Yamato's white hair eventually fades into an aqua-green and bluish color the further it goes down.
Yamata is going to become the 11th member of the Straw Hat Pirates soon. We thought she will become one by the end of the Wano arc, but unfortunately, she stayed to help Momonosuke and the others raise Wano back to glory again. But Yamato is confirmed to be the unofficial 11th member of the Straw Hat Pirates.
Though Luffy has a connection with Yamato as a friend (and did offer a position on the crew should Yamato want it someday), it's not exactly one where you'd totally buy Luffy accepting Yamato as a full member of the crew. On top of that, it was also someone else's time to join the crew.
Yamato possesses the Inu Inu no Mi, Model: Okuchi no Makami, which is a Mythical Zoan type devil fruit. It allows him to turn into the mythological wolf deity. While fighting against Kaido, he showed all the different versions of his devil fruit, including an awakened form.
Ace and Yamato definitely had a kid. Yamato's pelvic muscles were so powerful, however, that the child was launched into orbit upon birth. Not to worry, though, as Eneru is doing a great job of raising them on the moon.
Koala seems to be Sabo's partner in crime. However, she's also modeled some of her clothes after Sabo, helping the two match for adventures on and off the revolution.
Yamato is known as the "Oni Princess," which points toward him being a member of the Oni race. The two of them have one main thing in common and that is their horns.
Kaido is an Oni. Oni are hulking, monstrous demons in Japanese mythology. In the One Piece Universe, Kaido is an Oni (Ogre) and is a separate species as humans.
Yamatos mother is gloriosa. As an old lady she goes by elder nyon. Why this is 100% the case and oda hinted this across the story. Gloriosa said she had to leave the island because of the love sick illness and the only reason she survived is because she left.