Oshi

Biodata

Feature	Value
Name	Oshi (奥西)
Alias(es)	Osiris; Nether Princess
Species/Race	Phantom God; described as a Mythical Zoan user
Gender	Female
Affiliation	Beasts Pirates
Occupation/Role	Pirate executive; combatant; instructor
First Appearance	Chapter 13

Power Progression

Stage / Realm / Level	Chapter	Notes
Observation Haki awakened	22	Learns to sense an opponent's energy through Ra's instruction, then counters Burufatt with a mini Thunder Cannon.
Armament Haki awakened	33	Rapidly manifests crimson Armament Haki threaded with golden lightning and learns to concentrate it into her fingers.
Flight / Lightning Wings	151	Returns from the Sky Island expedition able to fly with wings.
Hyper Meteoric Burst	166	Converts Divine Power into propulsion, surpassing Kaido's precognitive tracking; the exertion leaves her exhausted.
Future Sight completed	170	Finishes training in Future Sight before leaving Fenrir Island.
Phase 1 combat state	215 248	Regulates Divine Power into a stable full-power state balancing consumption and recovery.
Underworld God Authority: Judgment Thunder	320	Resolves to use her Underworld authority, which governs weather, seasons, and judgment of souls.
Complete Underworld God Authority	327	Fully awakens her authority; divine “makeup” and crimson Priest Glyphs appear around her golden eyes.
Void Creation	369	Creates a crimson crystalline sword through “Trace On,” imitating Ushimaru's weapon.

Background / History

Oshi arrived in the world alongside Ra and Obe and encountered Kaido while still physically childlike. Startled awake by him, she immediately attacked with Superconducting Wave — Thunder Cannon. 13 16

Under Ra's guidance and Burufatt's sparring, Oshi developed Haki at extraordinary speed. Her exceptional senses initially made Observation Haki difficult because she reflexively relied on sight, sound, calculation, and instinct; she nevertheless awakened it during combat. 22 24 She later awakened crimson Armament Haki, visibly patterned with gold due to her Divine Power. 33

After joining the Beasts Pirates' campaigns, Oshi helped capture Fenrir Island and personally buried fallen enemies after perceiving their lingering souls. She used her Authority to guide those souls onward, establishing her sensitivity toward death despite her combativeness. 56

Her growth brought her into increasingly high-level conflicts. She defeated Vista, overwhelmed Marco and Jozu with Superconducting Wave — Thunder Cannon, challenged Big Mom, and later fought Admiral Sengoku. 152 153 203 205 245 250 Her clash with Big Mom forced her to confront the gap in Haki strength and question Kaido's belief that power alone determines right and wrong. 205 206

Following Burufatt's death, Oshi avenged him and returned with a rescued child. Her grief and resolve culminated in a complete awakening of her Underworld God Authority; she thereafter defined her duty as protecting death and the Underworld rather than reversing death. 327

Appearance

Oshi is a red-haired girl with golden eyes, wings, and a long crimson tail in combat. Her appearance becomes markedly more divine after fully awakening her Underworld authority. 152 215 327

• Crimson Armament Haki with golden lightning-like patterns. 33
• Scarlet wings used for flight and rapid repositioning. 151 203
• A long crimson tail capable of cracking solid ground. 215
• After her complete awakening, faint red eyeshadow and rotating crimson Priest Glyphs surround her golden irises. 327
• Later adopts more feminine, mobile clothing, including a red tube top, white hot pants, and a long coat. 370
• Sometimes wears a mask because her uncovered face distracts onlookers. 364

Personality

Oshi is impulsive, energetic, mischievous, and intensely drawn to anything she considers cool, especially weapons with dramatic effects. She frequently boasts about her talent, improvises grandiose move names, and can be easily motivated by sweets or flashy experiments. 33 165 181 217

Though often arrogant in battle, she is straightforward about her emotions and deeply attached to her companions. She mourns the dead, buries those she kills, worries about Burufatt, and intervenes when she senses souls in danger. 56 244 324 327 Her experiences with Big Mom and Kaido lead her to reject Kaido's attempts to dictate her beliefs: she insists that her life, will, and choices belong to herself. 205 215

Abilities & Skills

Phantom God Physiology and Divine Power

Oshi possesses a Divine Power core rather than conventional internal organs. Her body has high resistance and adaptability to external energy, and she can maintain a combat state that balances Divine Power expenditure with recovery. 22 215 304

• Her physical durability lets her endure powerful strikes with minimal movement. 42
• Her Divine Power can be compressed or incorporated into Phantom God Alloy experiments, though maintaining it in a solid state is difficult. 217 232
• She can form wings, fly, and fight in midair. 151 203
• Her speed can exceed light when using Super Meteor Burst. 244

Haki

Oshi uses Observation, Armament, and Conqueror's Haki. 22 33 204

• Observation Haki / Future Sight — senses energy and opponents' movements; later completes Future Sight training. 22 170
• Armament Haki — appears crimson with golden lightning patterns and can be concentrated into focused impacts. 33
• Conqueror's Haki — clashes directly with Big Mom's Conqueror's infusion. 204
• Her Haki-infused knee strike defeated Shimotsuki Ushimaru in the Royal Duel. 371

Lightning Techniques

Oshi uses lightning offensively, defensively, and for movement.

• Superconducting Wave — Thunder Cannon — a powerful lightning blast; its advanced form devastated a large portion of Pikoo Island. 16 153
• Summoning Thunder — kills 503 people aboard a ship, leaving only Mien alive but near death. 321
• Clock Up — instantly defeats Owen through extreme speed. 200
• Enemy Controller — sends electrical signals through conductive objects placed on a target's joints to guide or forcibly move their body. 273
  • Oshi notes that full control would require conductive material inserted directly into a target. 273

Speed Techniques

Oshi's speed is her defining combat advantage and makes conventional naval engagement extremely difficult against her. 166 247

• Hyper Meteoric Burst — transforms Divine Power into propulsion, moving so fast that Kaido's precognition loses track of her. 166
• Super Meteor Burst — a faster-than-light movement technique that leaves silver-white stardust. 244
• Light Backstab — a surprise attack used after being launched into the sea by Sengoku. 249
• Her high-speed maneuvering can outpace elite swordsmen and break their techniques before their blades can react. 247

Underworld God Authority

Oshi's dual divinities are Abundance and Pluto. Her Underworld God Authority encompasses seasonal and weather control, soul judgment, and responsibility for the dead. 320

• She sees and interacts with souls, comforts them, and sends them to the afterlife. 56
• Judgment Thunder — an authority-level technique she first resolves to use against Saint Natania's attack. 320
• She refuses to revive the dead, considering preservation of death and the Underworld her duty. 327

Void Creation

Oshi can manifest weapons from Divine Power through Trace On. 369

• Created a crimson crystalline longsword identical in form to Ushimaru's sword. 369
• She considers such imitations incomplete, able to copy form but not necessarily the swordsman's spirit or intent. 370

Fish-Man Karate

Despite lacking formal training, Oshi can understand Fish-Man Karate techniques by observation and adapt them to different body types. 273

• Uses Haki-infused Pirate Great Iron Fist. 42
• Teaches Jinbe by correcting movements to suit his physique rather than forcing a standard stance. 273
• Uses Enemy Controller to demonstrate the correct movement sequence directly through Jinbe's body. 273

Equipment / Weapons / Items

• Signature Weapon — a crimson brick-shaped weapon made from Oshi's own Phantom God Alloy; it is keyed primarily to her Divine Power. 264
• Heavenly Fire Holy Judgment — Obe's reduced-replica weapon, which Oshi has operated after receiving instructions. 181
• Mask — worn to prevent her appearance from incapacitating or distracting others. 364

Relationships

• Ra — eldest sister and primary mentor; teaches Oshi energy sensing and encourages her to form her own values rather than accept Kaido's worldview. 22 205 206
• Obe — younger sister, frequent rival, collaborator, and weapon-maker; the two bicker constantly but support each other in combat and research. 32 35 217 232
• Kaido — senior figure and combat mentor; trains Oshi in Haki, but their conflict over freedom and strength leads Oshi to assert her independence. 164 166 215
• Burufatt — Fish-Man Karate master, mentor, and close guardian figure; he comforts Oshi after Fenrir Island and later recognizes her sensitive nature. 22 56 324
• Jinbe — student in Fish-Man Karate; Oshi tailors lessons to his body and appoints herself his master. 268 273
• Big Mom — powerful opponent whose superior Haki severely injures Oshi and forces her to reassess her beliefs. 203 205
• Shimotsuki Ushimaru — Wano swordsman and recurring sparring rival; Oshi defeats him in the Royal Duel but acknowledges the difficulty of reproducing a swordsman's intent. 369 371 385
• Sengoku — Marine Admiral who attempts to recruit Oshi; she stalls him to recover power, feigns acceptance, and continues fighting. 248 249

Story Role / Major Arcs

• Haki training — awakens Observation and Armament Haki through sparring with Burufatt and competition with Obe. 22 33
• Fenrir Island campaign — helps seize the island, mourns its dead, and guides their souls onward. 56
• Sky Island expedition — supports Obe's Shandia alliance and returns able to fly. 134 151
• Whitebeard Pirates confrontation — defeats Vista, then overpowers Marco and Jozu with her Thunder Cannon. 152 153
• Whole Cake Island conflict — provokes Big Mom at Kaido's request, fights her seriously, and is forced to confront the limits of her Haki and her own values. 177 203 206
• Sengoku battle — rushes to save King, battles Sengoku and the Marines, and combines forces with Obelisk against his Buddha Golden Body. 244 250
• Underworld awakening — accepts Judgment Thunder, avenges Burufatt, and fully awakens her Underworld God Authority. 320 327
• Wano Royal Duel — defeats Ushimaru and demonstrates Void Creation before the Wano samurai. 369 371

Trivia

• Oshi loves cakes and sweets; Kaido persuades her to attend Whole Cake Island's founding ceremony by mentioning its desserts. 165
• She is fascinated by game-like weapons and power systems, particularly the Heavenly Fire Holy Judgment and layered weapon outputs. 181 264
• She calls herself Jinbe's master and advises him to use aliases depending on whether he is causing trouble or being repaid for a good deed. 268
• Her name as “Nether Princess” becomes widely known across the seas after years of activity with the Beasts Pirates. 286