Keen

Biodata

Feature	Value
Name	Keen (基恩)
Alias(es)	Keen Anger; “The Plunderer”
Species/Race	Human; Artificial Mythical Zoan user
Gender	Male
Affiliation	Rain’s crew aboard the Ashen
Occupation/Role	Former bounty hunter; navigator, intelligence officer, and combatant
Status	Active
First Appearance	Chapter 128

Power Progression

Stage / Realm / Level	Chapter	Notes
Independent bounty hunter	128	Introduced as a masked ambusher pursuing Breed’s bounty with concealed weapons and intelligence on Impel Down Level 6 escapees.
Artificial Mythical Zoan user	204	Gains an artificial Mythical Zoan Dragon power, but Aira immediately identifies his unstable physique and poor control.
Full Azure Dragon transformation	249	Reveals a massive pink-scaled dragon form capable of Blast Breath, tail strikes, and overwhelming physical force.
Refined dragon-scale defenses	302	His defenses evolve after fighting Saint Mars; he resolves to further improve his Haki and martial arts.
Conqueror’s Haki awakening	323	Under Yamato’s pressure, awakens the “King’s Disposition”; black lightning erupts from his body and his scales reform with obsidian-like markings.
Conqueror’s Haki Infusion	324	Infuses Conqueror’s Haki into Dragon Horn: Skybreaker and sustains a prolonged battle against Yamato despite his inexperience.

Background

Keen was originally a minor New World bounty hunter who relied on firearms, thrown weapons, concealment, and carefully gathered intelligence. He was hunting Breed from aboard a civilian merchant ship when Rain discovered him hiding among the survivors. Keen attempted to ambush Rain with a poisoned dart, but was immediately outmatched and coerced into providing information on escaped Level 6 prisoners. Rain then forced him into a practical arrangement: Keen would guide him to targets, while retaining the bounties they earned. 128

Initially terrified of Rain and focused almost entirely on money, Keen became the Bedrock’s navigator and intelligence source. He reported on “‘Chimera’ Garo,” Kaido’s appearance in Dressrosa, and other New World developments, while gradually abandoning any hope of escaping Rain’s crew. 129

Appearance

Keen initially conceals his identity beneath a cloak, mask, and exaggerated green cactus hat, with numerous weapons carried beneath his clothing. 128

• Tall, heavily built man with a rough, battle-worn appearance. 128 315
• Uses a partial dragon form with pink scales, claws, horns, a tail, and dark-gold dragon eyes. 204 319
• His full Mythical Zoan form is a massive pink-scaled Eastern dragon, later reaching roughly one hundred meters in length. 249 305
• After awakening Conqueror’s Haki, damaged scales regenerate with black, obsidian-like markings. 323

Personality

Keen is loud, excitable, greedy, and intensely battle-hungry. His habitual laugh, “Zehahaha,” accompanies both reckless challenges and moments of triumph. He initially judges events through bounties and profit, reacting with outrage when Rain abandons valuable targets or loses money. 144 171

His time under Rain changes him from a frightened opportunist into a fiercely loyal crewmate. He refuses Balk’s demands to surrender Rain’s treasure even while badly wounded and facing hundreds of pirates, trusting absolutely that Rain will come for him. 196 Keen increasingly seeks hardship for its own sake, requesting Seastone-weight training after witnessing Kaido’s power and treating powerful enemies as opportunities to forge his body. 245 248

Yamato’s comparison of him to Kaido forces Keen to define himself beyond his Devil Fruit. His determination to be recognized as “Keen” rather than Kaido’s replacement becomes the catalyst for his Conqueror’s Haki awakening. 323

Abilities & Skills

Artificial Mythical Zoan: Azure Dragon

Keen possesses an artificial Mythical Zoan based on the Fish-Fish Fruit, Azure Dragon form. It grants extreme physical power, flight through flame clouds, powerful regeneration, and several dragon transformations. 204 319 324

• Full Dragon Form — Becomes a huge pink-scaled dragon capable of overwhelming strikes, massive tail sweeps, and aerial mobility. 249 305
• Human-Beast Form: Azure Dragon Battle Body — A combat-oriented hybrid form with dragon claws, horns, scales, tail, and enhanced speed. 323
• Blast Breath — Fires destructive dragon breath; used to blind the Deep-Sea Devourer after Rain opened a vacuum rift through its defenses. 249 307
• Azure Dragon Flame Clouds — Provides high-speed movement and aerial maneuverability, allowing Keen to exploit the Obsidian Iron Bear’s slow turning speed. 319
• Regeneration — Rapidly restores damaged scales, bones, and flesh, enabling him to endure a prolonged war of attrition with Yamato. 324
• Limit: As a Devil Fruit user, direct exposure to deep-sea water leaves him helpless; Rain had to seal him in obsidian armor during the battle at God’s Cliff. 305 306

Haki

Keen uses Observation Haki, Armament Haki, and later Conqueror’s Haki.

• Observation Haki — Detected the concealed life signature of the Gun-Bear Construct among ancient wreckage. 312
• Armament Haki — Coats his dragon claws, horns, and tail to break through artillery barrages, battle ancient constructs, and reinforce his scales. 312 319
• Conqueror’s Haki — Awakened while refusing to yield to Yamato’s overwhelming attacks. 323
• Conqueror’s Haki Infusion — Used in Dragon Horn: Skybreaker against Yamato’s own infused attacks. His output briefly matched hers, but his control remained far below her experience level. 324

Dragon Martial Techniques

• Dragon Claw: Skybreaker — A Haki-coated claw strike capable of tearing through explosive barrages and clashing directly with Obsidian Iron Bear. 312 319
• Dragon Claw: Flash Barrage — A rapid multi-angle assault intended to overwhelm an opponent through speed. 323
• Dragon Fist: Sea-Breaker — A direct Armament Haki punch launched during his declaration of independence from Kaido’s legacy. 323
• Dragon Horn: Skybreaker — A horn-first charge enhanced by Conqueror’s Haki Infusion. 324
• Dragon Scale: Iron Wall — A Haki-reinforced defensive shield formed to survive the Obsidian Iron Bear’s point-blank particle-cannon blast. 319

Equipment / Weapons / Items

• Flintlock pistol — Keen’s primary weapon before gaining his Mythical Zoan power. 196
• Throwing weapons and poisoned cross darts — Used during his bounty-hunting career; Rain dismisses the darts as too weak to threaten major targets. 128 196
• Green cactus hat and mask — His identifying disguise when introduced as “The Plunderer.” 128
• Seastone dumbbells — Used for voluntary resistance training in his half-dragon form. 245

Story Role / Major Arcs

Recruitment by Rain

Rain discovers Keen while investigating hidden killing intent on a merchant ship freed from Breed’s control. Keen’s attempted ambush fails, and he is forced to share his intelligence on Level 6 escapees before joining Rain’s hunt as navigator and informant. 128 129

Keen initially objects when Rain allows Aira—a one-billion-Beli fugitive—to escape rather than claiming her bounty. Rain’s explanation that he kills only those who deserve it changes Keen’s understanding of his captain and strengthens his loyalty. 144

Dragon Fruit and Crew Growth

After Gran Tesoro’s destruction, Keen defends Rain and Carina’s stolen wealth against Iron Jaw Balk’s crew despite being exhausted and severely wounded. Rain rescues them, and Keen’s loyalty is recognized as absolute. 196

By the time Aira returns to the crew, Keen has consumed an artificial Mythical Zoan Dragon fruit. Aira humiliates him for relying on the fruit’s power without mastering his body, establishing the harsh training dynamic between them. 204

Ancient Continent and Deep-Sea Ruins

Inspired by Kaido’s Azure Dragon form, Keen requests continuous Seastone-weight training to strengthen every dragon scale. 245 On the primordial continent, he reveals his full dragon form but is temporarily restrained by native warriors using teamwork, vines, and Verdant Haki. 249

At God’s Cliff, Keen volunteers to fight the Deep-Sea Devourer in order to strengthen his damaged scales. He survives the monster’s bite and damages its eye, but deep-sea pressure, cracking armor, and lack of oxygen force Rain to rescue him. 305 306 307

Keen later detects and battles the Gun-Bear Construct, adapting to its artillery, bear-like strength, and mechanical traps before Rain subdues the weapon. 312 313

Rivalry with Obsidian Iron Bear

After Vegapunk rebuilds the Gun-Bear Construct as Obsidian Iron Bear, Keen challenges it to a rematch. He initially struggles against its Seastone armor, sonic cannon, and particle artillery, but exploits its inferior mobility through aerial attacks against its joints and blind spots. 319

Rain determines that the Iron Bear is better suited to fleet combat than one-on-one duels. Keen accepts this judgment, recognizes the construct as an ally, and offers to trust his back to it in battle. 320

Wano and Conqueror’s Haki

Yamato challenges Keen because his Azure Dragon power resembles Kaido’s. Her superior Haki and experience nearly crush him, but Keen refuses to become Kaido’s shadow and awakens Conqueror’s Haki. 323

Keen and Yamato escalate into a thirty-minute Conqueror’s Haki-infused battle across Wano’s sea and shoreline. Although Yamato dominates many exchanges, Keen endures through regeneration and willpower until both fighters collapse; they agree to a draw. 324

Relationships

• Rain — Captain and former captor. Rain forcibly recruited Keen for his intelligence and navigation skills, but Keen later becomes fiercely loyal and views Rain as the source of his rise in power. 128 196 323
• Aira — Crewmate and harsh corrective influence. She criticizes Keen’s shallow reliance on his new Dragon fruit, but later fights alongside him and calls him “Vice Captain.” 204 323
• Carina — Crewmate and fellow survivor of the Gran Tesoro escape. Keen defends her alongside Rain’s treasure; she later shows concern when he is badly injured fighting Obsidian Iron Bear. 196 319
• Obsidian Iron Bear — Rival turned battlefield ally. Their rematch begins as a contest of pride, but ends in mutual recognition of their respective roles and strengths. 319 320
• Yamato — Rival whose challenge triggers Keen’s Conqueror’s Haki awakening. Their battle ends in a mutually acknowledged draw. 323 324
• Kuma — Crewmate who removes Keen’s pain and exhaustion after his fight with Obsidian Iron Bear. 320

Notable Quotes

“I really am not Kaido. And I don't want to become a second Kaido! I am Keen!” 323

“The one thing I never lack is tough bones!” 323

“From now on, I’m trusting my back to you on the battlefield!” 320