Kaido

Biodata

Feature	Details
Name	Kaido (凯多)
Alias(es)	“Monkey” Kaido; Monster Intern 4 218
Species/Race	Oni Tribe 378
Gender	Male
Affiliation	Rocks Pirates (formerly); God of War Pirates 4 307
Occupation/Role	Former Rocks Pirates intern and division commander; Vice-Captain of the God of War Pirates; leader of the Ape-Orangutan Legion 205 307 340
Status	Active 378
Bounty	550,000,000 Belly 208
First Appearance	Chapter 4

Power Progression

Stage / Realm / Level	Chapter	Notes
Conqueror’s Haki awakening	18	Awakened his kingly disposition after his confidence was shaken by Ares’ rapid growth.
Armament Haki mastery	50	Achieved perfect control in just over twenty days; his hardened strikes greatly increased his punching power.
Renewed Conqueror’s Haki manifestation	63	Reaffirmed his resolve to surpass Ares, releasing an aura strong enough to draw praise from Rocks and surprise Shiki.
Swordsmanship training	128	Began learning swordsmanship from Ares to integrate blade techniques with his Mace fighting style.
Mythical Zoan Devil Fruit acquisition	184	Found and consumed an unidentified Devil Fruit from a treasure chest on the seafloor; it proved to be a Mythical Zoan.
Monkey-Monkey Fruit, Mythical Zoan, Hanuman Form	187	Unlocked a four-faced, eight-armed Demon Ape form with immense physical power and near-complete all-directional vision.
Advanced Zoan combat development	268	Developed the fruit through repeated training with Ares, gaining exceptional speed, multi-limbed coordination, and greater destructive force.
Ryuo Haki mastery	332	Demonstrated mastery of Ryuo during his duel with Kozuki Oden.

Background

Kaido became the strongest warrior of the war-driven Wokaa Kingdom at only ten years old, having been forged through repeated life-or-death battles. Before joining the Rocks Pirates, he was an orphan; his experiences left him determined to control his own destiny, live freely, and never lack food or alcohol. 124 232

He entered the Rocks Pirates as its feared “monster intern.” When Ares joined the crew, Kaido stepped forward to fight him in Rocks’ place, but Ares quickly became the benchmark Kaido could not surpass. His defeats and Linlin’s unfavorable comparison of him to Ares damaged his pride, driving him into brutal training and the rapid mastery of Armament Haki. 4 24 50 53

Kaido’s rivalry with Ares gradually became loyalty. After witnessing Ares’ strength, he asked to follow him and witness the birth of the world’s strongest creature; Ares accepted him as a subordinate. During Ares’ later recovery, the two acknowledged each other as brothers. 71 124

Appearance

Kaido is an enormous, broad-shouldered Oni whose massive physique dwarfs ordinary pirates. At his introduction, he stood roughly seven to eight meters tall and carried himself with the oppressive presence of a wild beast. 4

• Two bull-like horns protrude from his head. 4
• His heavily muscled body is repeatedly compared to steel, rock, and iron. 4 268
• He typically carries a huge spiked Mace over his shoulder. 4
• In Hanuman form, dense black hair covers his body, while three additional arms and three additional faces emerge. 187
• His four faces cover the front, back, left, and right, leaving few blind spots in combat. 187 197

Personality

Kaido is intensely competitive, battle-hungry, and unwilling to accept inferiority. His desire to overcome Ares initially manifests as resentment and self-doubt, but he repeatedly turns humiliation into motivation to train harder and seek stronger opponents. 18 24 52

Despite his fierce and ruthless exterior, Kaido is perceptive and loyal toward those he recognizes as comrades. He considers Ares both an aspirational figure and an elder brother, risks his life to rescue him from Marine forces, and later acts protectively toward Katakuri. 108 120 159

He can also be practical and strategically minded. Kaido offered Ares useful ideas for developing the Azure Dragon Fruit, used fear to maintain order among arriving pirates on Hachinosu, and sought to build a stronger force under Ares’ leadership. 89 90 215 253

Abilities & Skills

Mythical Zoan Devil Fruit

Kaido possesses the Monkey-Monkey Fruit, Mythical Zoan, Hanuman Form, which transforms him into a four-faced, eight-armed Demon Ape and grants the special trait described as Invincible Monstrous Strength. 187 196

• Gains eight powerful arms, allowing simultaneous offense, defense, and weapon use. 187 268
• Gains four faces, enabling him to monitor attacks from nearly every horizontal direction. 187 197
• His transformed body combines extreme power with high speed; Zephyr was unable to identify a clear weakness during their battle. 268 270
• Can form an eight-armed defensive shield strong enough to block Zephyr’s Punch Wave without visible injury. 268
• Tore an enormous stone mountain from the ground and hurled it toward Marine G1 Base. 268
• Initially struggled to coordinate his new arms and relied on their quantity rather than refined tactics. 232

Haki

Kaido possesses both Conqueror’s Haki and Armament Haki, later mastering Ryuo. 18 50 332

• Conqueror’s Haki — Releases a domineering aura born from his ambition to become a king and stand beside Ares. 18 63 184
• Armament Haki — Reached full control in less than a month and can harden his body and attacks. 50 52
• Ryuo — Used against Kozuki Oden to match Oden’s Fire Festival Meteor with Thunder Bagua. 332

Mace Combat

Kaido’s principal weapon is a huge spiked Mace, used with overwhelming physical force and Haki. 4 260

• Thunder Bagua — A signature sweeping Mace strike capable of seriously injuring CP0 agents despite their Tekkai and Haki defenses. 216 271
• Club Aura — Projects powerful Mace-based attacks that can clash with Oden’s sword techniques. 333
• Destroyed Marine G1 Base cannons and its city gate during the assault on the base. 260
• Had several large Maces commissioned to better suit his eight-armed Devil Fruit form. 216 220

Swordsmanship and Rokushiki

Ares trained Kaido in swordsmanship and Rokushiki, expanding his combat style beyond brute-force Mace attacks. 128 333

• Can use swordsmanship in direct combat, surprising Kozuki Oden and onlookers. 333
• Combines sword techniques, Club Aura, Haki, and his Devil Fruit’s additional arms for unpredictable offense. 333
• His strength allows even comparatively simple techniques to carry dangerous force. 333

Physical Prowess

Even before obtaining his Devil Fruit, Kaido possessed exceptional raw strength, resilience, and training discipline. 4 52

• Destroyed the mountain Ares was using for training with a single punch. 52
• Bullets and cannon fire cause only superficial injuries, allowing him to continue fighting through sustained gunfire. 105
• Defeated an 80 million Belly pirate with ease. 161
• His underwater punches lose substantial force due to water resistance, and he was overpowered by an ancient monster fish-man in the deep sea. 166

Equipment

• Spiked Mace — Kaido’s primary weapon and the focus of his Thunder Bagua techniques. 4 216
• Multiple custom Maces — Specially made to complement the many arms of his Hanuman form. 216
• Weapons commissioned from Shimotsuki Kozaburo — Kaido requested additional forged weapons from the Wano master blacksmith. 220

Relationships

• Ares — Former rival, then subordinate, sworn younger brother, and later vice-captain. Kaido views Ares as the figure he aspires to become and repeatedly fights to protect or support him. 71 108 120 124 307
• Rocks D. Xebec — Former captain. Rocks allowed Kaido to fight Ares, later promoted him to division commander, and privately sought to use Kaido’s ambition to counterbalance Ares. 4 205 206
• Charlotte Linlin — A powerful rival whose victories and insults fueled Kaido’s desire to surpass Ares and become stronger. 24 231
• Whitebeard Newgate — Ally and drinking companion. Whitebeard recognizes Kaido’s rare talent and battle-driven nature. 71 332 378
• Katakuri — Rival and junior trainee. Kaido initially judged Katakuri unready for Ares’ harsh training, but later acknowledged his courage and allowed him to join the group. 159 161
• Shimotsuki Kozaburo — Wano blacksmith whom Kaido asked to forge weapons suited to his fighting style. 220
• Zephyr — Recurring Marine opponent. Their clashes tested Kaido’s newly acquired Mythical Zoan powers and demonstrated his rapid growth. 196 197 268

Story Role & Major Arcs

Rocks Pirates Rookie

Kaido enters the story as the Rocks Pirates’ monster intern and challenges Ares soon after Ares joins the crew. The encounter begins their long rivalry, with Kaido striving to overcome Ares’ overwhelming growth. 4 18 52 53

Ares’ Brother and Subordinate

Following Ares’ battle and recovery, Kaido abandons direct rivalry in favor of following him. He becomes one of Ares’ closest companions, trains alongside him, rescues him from the Marines, and commits himself to fighting at his side. 71 120 128 132

Hanuman Fruit Acquisition

During an undersea treasure expedition, Kaido finds a treasure chest and impulsively consumes its Devil Fruit. The fruit grants him the Hanuman form, restoring his confidence and allowing him to become a major combatant within the Rocks Pirates. 184 187 196 205

Marine G1 Base Assault

Kaido volunteers to spearhead the attack on Marine G1 Base, demolishing its defenses before confronting Zephyr. He displays his Hanuman form’s speed, resilience, multi-armed fighting style, and strength by attempting to destroy the base with a mountain-sized projectile. 259 260 268

God of War Pirates and Wano

After Ares begins forming the God of War Pirates, Kaido becomes its vice-captain. In Wano, he helps develop Kuri, trains recruits, defeats Kozuki Oden in a decisive duel, and takes command of the Ape-Orangutan Legion. 307 308 332 333 340

Notable Quotes

“One day, I’m destined to become the strongest existence on these seas!” 18

“Boss Ares, I will never again be that Kaido who can only stand behind you!” 184

“If you want to challenge Big Brother Ares, you have to get past Kaido—first!” 216