Kaido

Biodata

Feature	Information
Name	Kaido (凯多)
Gender	Male
Affiliation	Rocks Pirates
Occupation/Role	Pirate; Rocks Pirates’ first apprentice, later a full crew member 2 39
First Appearance	Chapter 2

Power Progression

Stage / Realm / Level	Chapter	Notes
Nine-Tails chakra cloak	28	Ron transfers Nine-Tails chakra to Kaido, greatly increasing his physical strength; his empowered strike sends Rayleigh flying.
Enhanced Nine-Tails chakra cloak	29	Ron provides a denser amount of chakra after Kaido’s initial boost, further strengthening him against Rayleigh.
Eight Gates learned	38	Successfully learns Ron’s “Ultimate Taijutsu” and immediately tests it with punches powerful enough to create huge waves and explosions.
Fifth Gate — Gate of Limit	39	Reaches his then-current limit during his challenge against Rocks, massively improving his speed and strength.
Sixth Gate	42	Opens the Sixth Gate after being overwhelmed by Sengoku and a God’s Knight, allowing him to counterattack despite severe injuries.

Background

Kaido was the first apprentice recruited by Rocks D. Zebek. While the senior Rocks Pirates argued over power and treasure, he focused on eating and pursuing a single goal: obtaining a Devil Fruit powerful enough to make him stronger, particularly after witnessing Whitebeard’s Tremor-Tremor Fruit 2.

Rocks selected Kaido to test the newly recruited Ron. Kaido’s combat experience initially gave him the advantage in the spar, but Ron’s superior strength, regeneration, and Tailed Beast Transformation overwhelmed him. When Ron formed a Tailed Beast Bomb, Rocks had to intervene to prevent Kaido from being killed 3 4 5.

Rather than seek revenge, Kaido accepted his defeat and challenged Ron to fight again after finding a suitable Devil Fruit. The two apprentices formed an alliance to protect one another within the unstable Rocks Pirates: powerful Devil Fruits would go to Kaido, while ordinary fruits would go to Ron 6.

After Ron’s promotion, Kaido sought full membership as well. He challenged Rocks, opened the Eight Gates through the Fifth Gate, and was decisively defeated; Rocks nevertheless accepted him as a full crew member 39.

Personality

Kaido is blunt, battle-hungry, and intensely driven by the pursuit of strength. He repeatedly regards powerful Devil Fruits as the fastest path to surpassing figures such as Rocks, Whitebeard, and Golden Lion, even when others warn him that the opportunity is a trap 6 39 40.

His ambition is balanced by a straightforward loyalty uncommon among the Rocks Pirates. He accepts Ron as an ally after their fight, values their “Intern Alliance,” and later recalls both Ron and Rocks while trapped in Sengoku’s ambush 6 19 42. He is also socially inexperienced, becoming visibly flustered around Shakky despite his confidence in battle 8.

Kaido is impulsive and often reckless. He secretly infiltrates Saint Sebastian alone for the rumored legendary Devil Fruit, falls for Sengoku’s fake fruit, and fights on even after recognizing that the operation was a trap 40 41 42.

Abilities & Skills

Combat Experience and Haki

Kaido has fought for survival since childhood and possesses extensive battle experience. During his first fight with Ron, he coats his spiked club in Armament Haki and pressures Ron with repeated attacks 4.

• Uses a Haki-coated spiked club in direct combat.
• Produces shockwaves strong enough to destroy incoming cannonballs during the World Government convoy battle 11.
• Can continue fighting after severe injuries, including Sengoku’s shockwaves and an ambush by a God’s Knight 42.

Eight Gates

Kaido learns the Eight Gates from Ron, whom he calls the user of “Ultimate Taijutsu.” Opening the Gates sharply increases his physical strength and speed, but pushes his body to dangerous extremes 36 38.

• Reaches the Fifth Gate, Gate of Limit, during his fight with Rocks 39.
• The Fifth Gate lets him move too quickly for Sengoku to track and drive Sengoku’s giant Buddha form backward with a club strike 42.
• Opens the Sixth Gate after sustaining heavy injuries, then catches the blonde God’s Knight off guard and smashes her into the ruins 42.
• His highest documented Gate is the Sixth; no use of the Seventh or Eighth Gate is shown.

Borrowed Nine-Tails Chakra

Ron can transfer Nine-Tails chakra to Kaido, covering him in a pale-red chakra cloak and dramatically amplifying his power 28 29.

• The initial enhancement allows Kaido to send Rayleigh flying with a club strike 29.
• Kaido cannot command Ron’s Nine-Tailed Fox Demon or freely take its power; Ron repeatedly refuses his demands to “lend” it to him 28 34.
• The chakra cloak is a temporary enhancement supplied by Ron, not Kaido’s own Devil Fruit power 28 40.

Equipment

• Spiked club — Kaido’s primary weapon; used with Armament Haki and the Eight Gates 2 4 42.

Relationships

• Rocks D. Zebek — Captain and mentor. Rocks recruited Kaido as his first apprentice, later accepted him as a full crew member, and personally went to Saint Sebastian to retrieve and punish him for acting alone 2 39 40.
• Ron — Rival, ally, and teacher. Their spar ends in Kaido’s defeat, but they form the Intern Alliance; Ron later teaches him the Eight Gates and lends him Nine-Tails chakra 4 6 28 38.
• Whitebeard — One of the few Rocks Pirates Kaido trusts. Whitebeard advises him to patiently seek the right Devil Fruit and later joins the effort to rescue him from Saint Sebastian 6 40.
• Shakky — Kaido becomes shy and lovestruck around her, contrasting sharply with his usual aggression 8.
• Sengoku — Opponent at Saint Sebastian. Sengoku traps Kaido with a fake Devil Fruit, unsuccessfully tries to recruit him, and battles him in Golden Buddha form 41 42.
• Blonde God’s Knight — Ambushes Kaido during his fight with Sengoku. Kaido repeatedly crushes her with his club, but her regeneration prevents him from finishing her 42 44.

Story Role / Major Arcs

Rocks Pirates Apprentice

As Rocks’s first apprentice, Kaido serves as Ron’s first major opponent. His defeat establishes Ron’s unexpected strength, while Kaido’s reaction establishes his long-term obsession with acquiring a powerful Devil Fruit 2 3 4 5.

Heavenly Tribute Operation

Kaido joins Ron, Whitebeard, Stussy, and Ochoku in the ambush of a World Government convoy. He helps defend their speedboat from cannon fire, infiltrates the warship with Ron, and searches the cargo hold specifically for Devil Fruits rather than treasure 9 11 13.

Intern Alliance and Eight Gates Training

Kaido’s alliance with Ron develops from a practical arrangement into a close, argumentative friendship. After watching Ron use the Seventh Gate, Kaido insists on learning the technique and succeeds in mastering the Eight Gates 19 34 36 38.

Saint Sebastian Incident

Obsessed with a rumored legendary Devil Fruit, Kaido investigates Saint Sebastian alone despite Rocks’s warning that it is likely a trap. Sengoku deceives him with a plastic fruit, and Kaido’s refusal to cooperate leads to a battle against Sengoku and the God’s Knights 40 41 42.

Kaido survives Sengoku’s attacks, the blonde God’s Knight’s ambush, and her apparent immortality by relying on the Sixth Gate and later Ron’s arrival. He ultimately fights alongside Ron against Sengoku before retreating from Imu, whose unknown power Ron judges too dangerous to confront directly 42 44 45 47.

Notable Quotes

“I just lack a powerful Devil Fruit.” 6

“When I find the Devil Fruit that belongs to me, let's fight again.” 6

“Ron, you're a real bro.” 29

“This... was made for me, wasn't it?” 39

Trivia

• Kaido’s attempt to obtain the “legendary Devil Fruit” ends with him biting a plastic imitation prepared by Sengoku 41.
• He initially calls the Eight Gates “Ultimate Taijutsu” and improvises increasingly awkward activation names before adopting Ron’s proper terminology 37 39.
• Despite frequently demanding Ron’s power, Kaido is denied a chakra cloak for the battle against Imu because Ron believes Kaido would be killed in a direct confrontation 50.