Xi Yan

Biodata

Feature	Information
Name	Xi Yan (西炎)
Alias(es)	Blood-Eyed Ninja; Ōtsutsuki Xi Yan; Sunglasses Man
Species/Race	Uchiha–Senju mixed-blood
Gender	Male
Affiliation	Straw Hat Pirates
Occupation/Role	Ninja; Straw Hat Pirate
Status	Alive; officially presumed dead by the World Government after the Mary Geoise incident 315 321
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Sharingan — documented use	5	Uses genjutsu through his eyes to subdue enemies and force information from a captive.
Armament Haki	134	Learns to combine willpower with physical strength as invisible armor, then considers applying it to his attacks.
Mangekyo Sharingan	158	Awakens the Mangekyo Sharingan and gains the dojutsu Kido Mitama Son and Takemitsuhiko no Mikoto.
Skeletal Susanoo	169	Manifests a pale-gold skeletal frame and arms for defense.
Upper-Body Susanoo	215	Susanoo develops a fleshed-out upper body and manifests the Kido Time Piercing Spear.
Conqueror's Haki	313	Awakens Conqueror's Haki while exhausted and surrounded by the God's Knights.

Background

Xi Yan transmigrated into the world of One Piece for a second time. Upon recognizing Luffy, Zoro, Nami, and Chopper aboard the Sea Train, he realized where he was, though his knowledge of the world's events only extended as far as the Water Seven period 1.

After running across the sea to reach the train, Xi Yan introduced himself as a ninja. He clarified that he was not from Wano despite the world's association of ninjas with that country 1. Luffy immediately invited him to join the Straw Hat Pirates, and Xi Yan accepted without hesitation 1 2.

His Uchiha–Senju heritage was initially unknown even to Xi Yan before his Sharingan awakened. He later explained that the Sharingan's evolution depends on intense mental stimulation and that its reputation in his original world was associated with misfortune 27.

Appearance

Xi Yan is chiefly identified by his blood-red Sharingan, an eye trait unique enough that strangers recognize him as the Blood-Eyed Ninja 62 410.

• Initially appears in unfamiliar, distinctive clothing while boarding the Sea Train 1.
• His Sharingan is red and becomes more elaborate after awakening the Mangekyo Sharingan 178.
• His appearance changes considerably during the two-year separation, prompting him to use sunglasses to help conceal his identity 347 363.
• His Mangekyo pattern resembles a clover beneath an hourglass-like design 178.

Personality

Xi Yan is calm, analytical, and typically assesses danger before acting. He studies enemy abilities, recognizes hidden motives, and uses clones or transformations to gather information rather than relying only on direct combat 118 293 490.

He is fiercely protective of his companions. He refuses to gamble with the Straw Hats' safety, places himself between Robin and Kuma, and treats enslaved children and ship spirits as family 87 110 143. His concern can coexist with ruthless efficiency: enemies threatening his allies are often incapacitated, terrified through genjutsu, or killed without hesitation 5 137 143.

Xi Yan is highly confident in his own strength, at times to the point of arrogance. He challenged three Marine Admirals at once during the Marineford conflict and declared himself invincible despite warnings that his immortality is limited by stamina 230.

Abilities & Skills

Ninjutsu and Chakra Control

Xi Yan is a ninja capable of using chakra-based techniques that the inhabitants of the One Piece world regard as extraordinary.

• Runs across the sea using a ninja ability 1.
• Uses Fire Release to defeat multiple Marines in a single attack 9.
• Creates an Earth Flow Wall to block Haki-infused arrows 304.
• Uses medical ninjutsu for treatment and surgery, including removing the marks from Hancock, Sandersonia, and Marguerite's backs 27 177.
• His naturally durable mixed-blood physique helps him withstand heavy attacks 112.

Water Release

Water Release is Xi Yan's most strategically important ninjutsu in naval combat.

• Uses Water Release: Twin Water Tornado to open a safe path through the approaching Gods of Water tsunami 2.
• Forms colossal water dragons that destroy the Sea Gods obstructing the Sea Train 3.
• Can lift or propel ships through the air, allowing the Thousand Sunny and allied vessels to evade Navy fleets 69.
• Creates routes across the battlefield at Marineford, carries Little Oars onto the encirclement wall, and transports allies toward the execution plaza 246.
• Uses Water Style: Dancing Fish to move freely underwater 410.

Shadow Clone Technique

Xi Yan creates autonomous shadow clones for combat, scouting, rescue, and coordinated operations.

• Sent a clone with Ai Ke's group while his main body went to rescue the Straw Hats on Thriller Bark 87.
• Uses clones to coordinate the liberation of slaves and search for Devil Fruit users 143 304.
• His clones can relay information before dispersing; he also employs stronger Wood Clones for hazardous assignments 360.
• Going Merry learned the Reverse Summoning Technique through Xi Yan's instruction and can summon him through their contract 63 178.

Sharingan and Genjutsu

Xi Yan's Sharingan grants enhanced perception and powerful mental techniques.

• Can subdue opponents, force testimony, and make targets lose consciousness through genjutsu 5 27.
• Detects hidden or invisible enemies and can see in complete darkness through its night-vision capability 84 121.
• Uses illusions to terrify or incapacitate enemies, including Perona and groups of bounty hunters 98 137.
• Can control powerful creatures and people, including Sea Kings, Navy officers, and Bartholomew Kuma 178 233 235.
• Its hypnotic techniques are valuable for interrogation, infiltration, and opening otherwise inaccessible routes 182 419.

Mangekyo Sharingan

Xi Yan awakened the Mangekyo Sharingan during his battle with Akainu 158.

• Kido Mitama Son — Allows Xi Yan to recover from otherwise fatal injuries; after an arrow pierces his heart, his body vanishes and reappears unharmed 304.
• Yomitsu Toki — Freezes wounds in their existing state, preventing damaged targets from regenerating normally 302 309.
• Takemitsuhiko no Mikoto — Named as Xi Yan's second Mangekyo dojutsu, though its exact effect is not detailed in the provided account 158 653.
• Xi Yan's instantaneous revival differs from ordinary super-regeneration: he can recover without leaving his body vulnerable during the process 327.
• His immortality is not absolute; exhaustion can still leave him vulnerable to death 230.
• Sustained Mangekyo and Susanoo use causes severe physical and ocular pain, as well as mental fatigue 177 215 262.

Susanoo

Xi Yan manifests a pale-gold Susanoo as an armored giant construct.

• Begins as a skeletal frame with arms that protects him from Hancock's attacks 169.
• Develops into a fleshed-out upper-body form during his battle against Magellan 215.
• Can use Yasaka Magatama to annihilate groups of Nightmare Creatures 304.
• Can withstand and break through Aokiji's freezing, though extensive use causes severe pain 260 262.

Kido Time Piercing Spear

The Kido Time Piercing Spear is Xi Yan's exclusive pale-gold Susanoo weapon, marked with an hourglass motif 215.

• Severed Magellan's Highly Poisonous Demon Soldier's arm and prevented it from regenerating 215.
• Suppresses the regenerative abilities of Nightmare Creatures and Celestial Dragons struck by it 302 307.
• Can be wielded defensively to shatter incoming giant hailstones 405.

Haki

Xi Yan received instruction on Haki from Rayleigh 133.

• Armament Haki — Mastered by directing his willpower through Yin Release and combining it with his physical strength 134.
• Can apply Armament Haki beyond his body, including to other attacks 134.
• Conqueror's Haki — Awakened in Mary Geoise under pressure from the God's Knights 313 331.

Sealing, Summoning, and Transformation

Xi Yan possesses several utility techniques suited to infiltration and travel.

• Uses Sealing Scrolls to store supplies, weapons, and Sea Stone handcuffs in compact form 178 309.
• Maintains a summoning contract with Going Merry, allowing mutual contact through Reverse Summoning 63 178.
• Uses the Transformation Technique to disguise himself as people or objects, helping him evade the World Government after being declared dead 293 321.
• Uses smoke bombs as distractions while escaping stronger opponents 313.

Equipment / Weapons / Items

• Kusanagi Sword — A chakra-conducting sword capable of carrying Xi Yan's various abilities 106.
• Kido Time Piercing Spear — His Susanoo's exclusive divine weapon, used to suppress regeneration 215 307.
• Sealing Scrolls — Store food, supplies, surgical tools, and restraints 177 178 309.
• Ninja Tool Bag — Carries scrolls and combat tools, including Sea Stone handcuffs 309.
• Sunglasses — Used after the timeskip to obscure his recognizable eyes and maintain his presumed-dead identity 347.

Relationships

• Monkey D. Luffy — Captain and close companion. Luffy invited Xi Yan into the crew immediately, trusts him with the crew's safety, and relies on him during the missions to save Robin and Ace 1 2 163.
• Going Merry / Merry — Xi Yan acts as her teacher and protector. He taught her the Reverse Summoning Technique, shares a summoning contract with her, and treats her as family 63 143 178.
• Boa Hancock — Their first meeting was hostile, but Hancock developed deep affection for Xi Yan after he challenged her authority and later removed the marks from her back. Their relationship grows increasingly intimate 167 177 331.
• Charlotte Galette — A Charlotte Family member who identifies herself as Xi Yan's fiancée. She seeks him on Sabaody and later accompanies him in Dressrosa 136 645.
• Silvers Rayleigh — Haki instructor and advisor. Rayleigh explains Haki to Xi Yan and urges him to prioritize the Straw Hats' growth and safety 133 286.
• Shakky — Trusted adviser and information source. She warns Xi Yan about the World Government's interest in his bloodline and assists him after the Mary Geoise incident 132 321.
• Bartholomew Kuma — Xi Yan uses hypnosis to control Kuma during Marineford, but refuses to endanger him unnecessarily and intends to thank him for previously helping the Straw Hats 230 235.
• Lola — Initially proposes to Xi Yan, but later becomes an ally against Gecko Moria after Xi Yan recognizes the shadowless captives as friends 87 90.
• Trafalgar Law — An uneasy ally whose hidden vendetta against Doflamingo Xi Yan quickly recognizes 458 490.

Story Role / Major Arcs

Enies Lobby

Xi Yan joins the Straw Hats during the Sea Train journey to Judicial Island. He saves the train from the Gods of Water, helps investigate Sanji's trail, infiltrates enemy positions, and uses the Sharingan to gather intelligence 2 5.

At Enies Lobby, Xi Yan opens the Great Gate of the Inner Island, defeats Marines, and later halts the Buster Call by destroying a Navy warship and defeating Vice Admirals Onigumo and Doberman 9 32.

Thriller Bark

Xi Yan searches for the captured Straw Hats, works with Lola's group, and investigates Moria's method of enhancing power with stolen shadows 87 90. He protects Chopper's feelings by allowing the crew to recognize Hogback's true nature themselves rather than immediately attacking him 92.

Sabaody, Amazon Lily, and Impel Down

At Sabaody, Xi Yan frees slaves from the auction house and rescues Merry and Going Merry 143. After Kuma separates him and Luffy from the crew, Xi Yan arrives at Amazon Lily, clashes with Hancock, and later removes the sisters' slave marks through surgery 158 167 177.

He and Luffy infiltrate Impel Down to rescue Ace. Xi Yan captures Sea Kings for transport, enters the prison through transformation and genjutsu, and battles Magellan with his upgraded Susanoo 178 182 215.

Marineford

Xi Yan supports Luffy's attempt to save Ace at Marineford. He challenges the Admirals, controls Kuma, uses Water Release to breach the Navy's defenses, and fights against Aokiji and Akainu 230 235 246 264.

His apparent immortality and ability to negate or resist powerful Devil Fruit attacks make him a major concern to the Marines, the Five Elders, and the Four Emperors 235 264 281.

Mary Geoise Incident

After the war, Xi Yan attacks Mary Geoise to send the Straw Hats' two-year training message, free slaves, retaliate against the Celestial Dragons, and seize resources 286 373. During the invasion, he defeats Nightmare Creatures, battles Celestial Dragons and Admirals, awakens Conqueror's Haki, and escapes by faking his death 302 307 313 315.

He later reveals that he killed seven Celestial Dragons, seized three Devil Fruits, and took roughly 30 billion Beli during the operation 347.

Post-Timeskip Journey

After reuniting with the Straw Hats, Xi Yan continues to serve as a protector, scout, and strategist. He helps the crew traverse the deep sea, investigates threats on Fish-Man Island, and explains his Mary Geoise actions to Jinbe 356 372 373.

During the Punk Hazard and Dressrosa events, he forms a tense partnership with Law, investigates Doflamingo's operations, fights Fujitora, and reunites with the Straw Hats at the Old King's Plateau alongside Galette 458 490 637 645.

Notable Quotes

“He'd tell you with his fists that none of his nakama can be taken away!!” 110

“No, I won't die. Because I am invincible!” 230

“Just call me... Ōtsutsuki Xi Yan!” 302