Yamato

Biodata

Feature	Information
Name	Yamato (大和)
Alias(es)	Kaido's daughter; formerly self-identified as Kōzuki Oden and Kaido's son 91 92
Gender	Female 91
Affiliation	Eternal Ark; previously confined on Onigashima under Kaido 91 271
Occupation/Role	Combatant; Eternal Ark tournament representative 271
Devil Fruit	Mythical Zoan: Wolf-Wolf Fruit, Great Mouth True God Form 284
First Appearance	Chapter 91

Power Progression

Stage / Realm / Level	Chapter	Notes
C-	91	Initial appraisal in her ordinary state.
C+	91	Reached through her Half-Beast Transformation, which enhanced her size, physical power, claws, and frost-infused attacks.
Observation Haki awakened	111	Awakened during her prolonged semi-final battle with Lao G, improving her ability to evade and counter his attacks.
Armament Haki awakened	147	Awakened while sparring with Meiser, who synchronized his breathing and perception with hers to guide her development.
B+	188	Strength was appraised at B+ after years of training; she had mastered all three forms of Haki, including Ryuo and Haki Coating.
A / Mythical Zoan Awakening	284	Entered her battle with Kaido at A-rank. After receiving elemental crystals and the Concept of Devour from Mercer, she awakened her Great Mouth True God fruit and defeated Kaido.

Background

Yamato grew up as Kaido's daughter on Onigashima, where Kaido confined her with Seastone shackles and an explosive collar. She initially defined herself as Kōzuki Oden, believing that becoming Oden was the path to freedom and to opening Wano Country's borders. She approached Mercer intending either to drive him away from Kaido or recruit him, but he defeated her twice and returned her shackles after she attacked again 91.

Her discussions with Mercer about Oden's diary forced her to confront the difference between admiring Oden and abandoning her own identity. She ultimately admitted that she wanted to be herself, travel the seas, and honor her promise to help Wano rather than imitate another person's life 92 93. Kaido rejected her request to remove her restraints and grant her authority over Wano, leading her to seek escape instead 93 95.

Mercer secretly took Yamato off Onigashima alongside Ulti, Page One, Ushiwakamaru, Hiyori, and Kawamatsu. Outside Wano, she formed bonds with the group, accepted Ushiwakamaru as her “little brother,” and began training extensively under Mercer 106 109.

Appearance

Yamato is a tall young woman with red demon horns. Her Mythical Zoan Half-Beast Transformation gives her white fur, canine features, a fluffy tail, claws, ice-blue eyes, and prominent fangs; in this state, she exceeds two meters in height 91. Following Dragon Bone State modification and continued training, she was documented at approximately two meters tall in her ordinary form 188.

• Red, upward-curving demon horns.
• Long dark hair.
• Ice-blue eyes in Half-Beast Transformation.
• White canine fur, tail, claws, and pink paw pads in Half-Beast Transformation 91 92.
• Wields a spiked morning star named Frost 126 284.

Personality

Yamato is energetic, direct, and fiercely resistant to being controlled. She rejects offers to serve other groups and refuses to return to Kaido's rule, even when doing so would spare her further suffering 95 111. Her determination is particularly clear in her challenge to Kaido, which she accepts as a fight she would rather die than abandon 284.

Although she once clung emotionally to the idea of becoming Oden, Yamato is capable of self-reflection. Mercer's criticism of Oden's choices left her shaken, but it helped her articulate her own ambitions: adventure, freedom, and fulfilling her promise to Wano on her own terms 92 93.

She is also playful and competitive around her companions. Her friendly rivalry with Ulti regularly turns into sparring, while her encounters with Boa Hancock become hostile because both are possessive of Mercer 216 245.

Abilities & Skills

Mythical Zoan Transformation

Yamato possesses the Mythical Zoan Great Mouth True God form, granting exceptional physical strength, endurance, recovery, and cold-based powers 93 284.

• Half-Beast Transformation — Increases her size and strength while granting claws, fur, fangs, a tail, and enhanced mobility 91.
• Ice manipulation — Produces frost, freezing winds, ice armor, and ice weapons 93 111.
• Servantless Ice Fang — Fires a concentrated, laser-like icy breath attack 147 284.
• Natural recovery — Her injuries begin healing during combat, giving her a major advantage in prolonged fights 207.
• Awakening — Defeated the wild will of her Zoan fruit, gaining greatly increased stamina, self-healing, and ice control, along with icy white cloud streamers 284.

Haki

Yamato has mastered all three forms of Haki through repeated high-intensity sparring and combat 188.

• Observation Haki — Awakened against Lao G after being pressured by his speed and combat awareness 111.
• Armament Haki — Awakened during a spar with Meiser; later demonstrated Ryuo-level Armament 147 188.
• Conqueror's Haki — Can coat her weapon in black-red lightning for direct clashes with powerful opponents, including Kaido 188 284.
• Haki Coating — Expertly applies advanced Haki coating to Frost 188.

Dragon Bone State

Mercer altered Yamato's skeletal structure through Dragon Bone State Modification, improving her control over her body and contributing to her later physical growth 188.

• Supports full-body power output in close combat.
• Complements her Mythical Zoan durability and recovery.
• Allows her to endure repeated high-level clashes with Haki-coated weapons 188 207.

Combat Skill

Yamato is a powerful close-range fighter who combines a spiked club, freezing attacks, Haki, and physical strength.

• Defeated Yak, a C- ranked pirate captain, with a single club strike 109.
• Fought Lao G for several hours in the World Fighting Tournament semi-finals 111.
• Held the upper hand against Boa Hancock during their hour-long battle 207.
• Matched Kaido's club clashes before eventually defeating him after awakening 284.

Equipment

• Frost — A Great Grade spiked morning star forged for Yamato. Its Wind Spray Shell pattern generates strong winds when infused with Haki, which she combines with her ice powers to create freezing gusts 126.
• Tonnage-enhanced Frost — Frost later gained the ability to change weight, allowing it to shift from nearly weightless to mountain-like force during a swing. The effect drains Yamato's stamina and cannot be directly applied to her body 204.

Relationships

• Kaido — Her father and former captor. Their relationship is defined by abuse, defiance, and lingering familial conflict; Yamato eventually defeats him and makes him leave Wano Country 91 284 285.
• Mercer / Meiser — Mentor, traveling companion, and closest ally. He helped Yamato abandon her Oden persona, escape Wano, develop her Haki, and awaken her Devil Fruit 93 106 147 284.
• Ulti — Close companion and friendly rival. They frequently spar and compete, though Ulti openly celebrates Yamato's victory over Kaido 216 284.
• Shimotsuki Ushiwakamaru — A connection to the samurai who helped Yamato as a child. After learning that Ushiwakamaru's father may have been one of those men, Yamato declares herself his older sister 105 106.
• Ace — Training partner. Yamato spars with him and encourages his growth, while Ace acknowledges her as stronger than anyone around him except Meiser 147.
• Boa Hancock — Rival for Mercer's affection. Their conflict escalates into an hour-long fight, followed by continued verbal hostility 207 245.

Story Role / Major Arcs

• Onigashima — Attempts to drive Mercer away from Kaido, loses to him, and begins reconsidering her identity as Kōzuki Oden 91 92.
• Identity and Escape — Chooses to become herself, asks Mercer to help her leave Wano, and escapes Onigashima with his group 93 95 106.
• World Fighting Tournament — Reaches the semi-finals, battles Lao G, and awakens Observation Haki 110 111.
• Training Period — Undergoes sustained training with Mercer, awakens Armament Haki, masters all three forms of Haki, and reaches B+ strength 147 188.
• Wano Rematch — Challenges Kaido as Yamato rather than Oden, awakens her Mythical Zoan power, defeats him, and leaves Wano's future to its people 284 285.

Notable Quotes

“I want to be myself. Oden had his own life experiences, and I haven't experienced them.” 93

“Yamato, I am Yamato, and only Yamato. I am no one else.” 284

Trivia

• An early appraisal identified Yamato's Devil Fruit as the Mythical Zoan Yamata no Orochi Form, while later records identify it as the Great Mouth True God form of the Wolf-Wolf Fruit 91 284.
• Mercer temporarily established a joking family connection between Yamato, Garp, and Kuzan by having her call Garp “Grandpa” and Kuzan “Brother Kuzan” 112.