Mei Mei: Full Biography & Role in JJK

🧾 Quick Overview Table about  Mei Mei JJK:

CATEGORY	DETAIL
Full Name	冥冥 (Mei Mei)
Species	Human
Gender	Female
Appearance	Pale blue/silver hair<br>Brown eyes (manga) / Lilac eyes (anime)
Sorcerer Grade	Grade 1
Occupation	Freelance Jujutsu Sorcerer
Status	Active
Family	Ui Ui
Manga Debut	Chapter 0-3 (cameo)<br>Chapter 40 (full)
Anime Debut	Episode 17
Japanese Voice	Kotono Mitsuishi
English Voice	Amber Lee Connors

Mei Mei is a Grade 1 jujutsu sorcerer operating as an independent, freelance sorcerer within the world of Jujutsu Kaisen. Unlike most sorcerers who align themselves with institutions like Tokyo Jujutsu High or pledge loyalty to Jujutsu Headquarters.

Mei Mei JJK operates on a transactional basis—her allegiance belongs to whoever offers the highest fees and commissions. This pragmatic, money-driven philosophy defines every aspect of her character, from mission selection to personal relationships.

Despite or perhaps because of her mercenary reputation, Mei Mei JJK commands significant respect across jujutsu society.

Her cursed technique, Black Bird Manipulation, allows her to control crows for reconnaissance and devastating offensive strikes, making her invaluable for intelligence-gathering operations and high-risk exorcisms.

She’s frequently accompanied by her younger brother, Ui Ui, whose unwavering loyalty and support enhance her operational effectiveness.

Mei Mei’s presence during critical events most notably the Shibuya Incident—cements her role as both opportunist and elite combatant.

She fulfilled her contracted duties during the crisis, confronted and defeated the Smallpox Deity (a special grade cursed spirit), then made the calculated decision to evacuate Japan entirely, relocating overseas to Hong Kong in the aftermath.

Her actions exemplify her core philosophy: survival and profit trump ideology every time.

Her connections to prominent figures like Satoru Gojo, Suguru Geto, and Utahime Iori place her amongst the older generation of contemporary sorcerers, though she never formally graduated from Tokyo Jujutsu High alongside them. She remains an alumni with professional ties rather than institutional loyalty.

Background

Mei Mei’s origins remain deliberately obscure, with Jujutsu Kaisen offering only fragmentary glimpses into her past. What’s confirmed is her rise to Grade 1 sorcerer status a distinction reserved for elite combatants capable of independently handling dangerous cursed spirits.

However, her path wasn’t driven by noble ambition or a desire to protect humanity; it was fueled by something far more tangible: money.

She established herself as a freelance sorcerer, accepting missions-for-fee from various clients whilst maintaining alumni connections to Tokyo Jujutsu High and occasional contracts with Jujutsu Headquarters.

This positioning allowed her to cherry-pick lucrative assignments without the bureaucratic constraints or ideological commitments that bind institutionally-aligned sorcerers.

Her younger brother, Ui Ui, has been her constant companion throughout her career, serving as assistant, emotional anchor, and unwavering supporter.

The exact circumstances of their upbringing aren’t explored in depth, but their bond uncomfortably codependent yet functionally effective forms the emotional core of Mei Mei’s limited personal connections.

Chronologically, she was active during the same era as Satoru Gojo and Suguru Geto, placing her amongst the generation that witnessed the seismic shifts in jujutsu society during and after the Hidden Inventory/Premature Death Arc.

Her professional relationship with Utahime Iori suggests collaborative missions during this period, establishing her reputation for reliability despite her transactional approach.

Geographically, Mei Mei JJK operated primarily within Tokyo and broader Japan until the Shibuya Incident.

Following that catastrophic event and the subsequent destabilization of Japanese jujutsu society, she relocated to Hong Kong, continuing her overseas operations far from Kenjaku’s machinations and the Culling Game chaos.

Mei Mei JJK Appearance

Mei Mei JJK cuts a distinctive figure, immediately recognisable by her long silver hair that cascades past her shoulders, often styled with a thick side braid framing one side of her face.

The near-white colouring gives her an ethereal quality that sharply contrasts with her grounded, mercenary personality. Her hair is meticulously maintained, reflecting the polished professionalism she projects in all dealings.

She typically wears a form-fitting black dress or bodysuit paired with leggings and boots, prioritizing both mobility and a sleek, clean aesthetic.

The outfit’s dark tones complement her cool-toned eye color—narrow, calculating eyes that rarely betray emotion but constantly assess value and risk. Her overall appearance projects confidence and capability; she carries herself like someone who knows exactly what she’s worth and won’t settle for less.

Her most distinctive accessory is the battle axe she wields—a weapon that appears comically oversized yet perfectly suited to her combat methodology. The axe isn’t ornate or ceremonial; it’s a brutal, functional tool designed for efficiency, much like Mei Mei JJK herself.

The contrast between her refined appearance and the visceral nature of her primary weapon reinforces the duality at her core: polished professionalism concealing ruthless pragmatism.

Physically, she appears to be in her mid-to-late twenties, with sharp facial features and composed bearing. There’s nothing wasted in her presentation every element serves a purpose, whether projecting competence to clients or intimidating potential adversaries.

Personality

Mei Mei JJK’s personality crystallizes around a single driving principle: self-interest. She’s refreshingly or disturbingly honest about this, openly stating that she works for the highest bidder and maintains no loyalty beyond contractual obligation.

This money-driven philosophy isn’t mere greed; it’s a coherent worldview that treats transparency as superior to hollow idealism.

However, reducing her to simple avarice misses crucial nuance. Mei Mei JJK is extraordinarily pragmatic and tactical, capable of making split-second decisions under pressure whilst maintaining long-term strategic objectives.

She’s not reckless or impulsive every action serves a calculated purpose, whether securing future income, preserving her reputation, or ensuring survival.

During the Shibuya Incident, she fulfilled contractual duties before making the rational decision to evacuate, demonstrating pragmatism over heroism.

She remains calm under pressure, even when confronting special grade threats like the Smallpox Deity.

This composure stems from thorough preparation; by conducting reconnaissance via Black Bird Manipulation before engagement, she eliminates uncertainty and controls variables.

When circumstances turn unfavourable, she adapts rather than panics, always identifying the optimal path forward.

Her relationship with Ui Ui reveals a different dimension. Whilst she’s manipulative and clearly enjoys his devotion, there’s genuine affection beneath the transactional surface.

She’s intensely protective of him, treats him as her most valuable asset, and relies on his support in ways she depends on no one else. The dynamic is uncomfortable bordering on inappropriate but demonstrates that Mei Mei JJK isn’t entirely devoid of emotional attachment.

Socially, she’s professional and charming when it serves her, capable of smooth-talking clients and negotiating favourable terms with disarming ease.

She can invest in others she mentored Yuji Itadori briefly provided there’s something to gain, whether reputation, future favours, or simply the satisfaction of shaping promising talent.

Her independent streak runs deep. She rejects institutional hierarchies not out of rebelliousness but because they constrain profitability and autonomy. She’ll cooperate with Jujutsu Headquarters or Tokyo Jujutsu High when terms align with her interests, but she won’t subordinate her judgement to theirs.

Abilities and Powers

Overview

Mei Mei’s status as a Grade 1 sorcerer places her firmly amongst jujutsu society’s elite, yet what makes her remarkable isn’t overwhelming cursed energy or flashy techniques. She represents the apex of what skilled application, tactical IQ, and creative use of binding vows can achieve.

Her cursed technique, Black Bird Manipulation, appears deceptively simple—even weak compared to abilities like Limitless or Cursed Speech but in her hands it becomes a versatile system enabling reconnaissance via crows, multi-target tracking, and devastating offensive strikes.

What truly defines Mei Mei JJK  as a Grade 1-level combatant is her ability to maximize efficiency. She doesn’t waste energy on unnecessary flourishes or engage in prolonged battles when a single decisive blow suffices.

Her strategic mindset, combined with physical prowess and intelligent exploitation of binding vows, makes her far more dangerous than her technique suggests on paper.

Physical Prowess

Whilst many sorcerers rely heavily on cursed techniques, Mei Mei JJK excels in close-quarters combat through exceptional axe proficiency and physical conditioning.

She wields her oversized battle axe with frightening ease, demonstrating both raw strength and refined technique. The weapon isn’t simply intimidation she delivers crushing blows capable of cleaving through cursed spirits and reinforced structures alike.

Her combat style emphasizes direct, overwhelming force. During her confrontation with the Smallpox Deity in Shibuya, she held her ground against an opponent whose cursed energy vastly outmatched her own, relying instead on superior technique and timing.

Her peak reaction speed allows her to parry cursed attacks, exploit openings, and position herself advantageously even against faster opponents.

Additionally, her agility and acrobatics enable fluid movement across complex urban terrain—essential during operations like the Shibuya Incident where battlefield mobility determined survival.

Her stamina proves equally impressive; she maintained combat effectiveness throughout the prolonged crisis whilst coordinating reconnaissance networks and engaging multiple threats.

Intelligence

Mei Mei’s tactical intelligence arguably represents her greatest asset.

She doesn’t simply react to threats she engineers favorable conditions before engagement begins. Her approach demonstrates strategic depth: battlefield scouting via crows allows her to map enemy positions, identify escape routes, and assess cursed spirit capabilities before committing to combat.

During the Shibuya Incident, this intelligence proved invaluable. Whilst other sorcerers were trapped within barriers erected by Kenjaku, Mei Mei JJK utilized her crows for city-scale reconnaissance, tracking curse movements and relaying critical information.

She identified the Smallpox Deity, assessed its threat level, and formulated a neutralization plan without unnecessary risk.

Her counter-domain awareness is particularly noteworthy. Mei Mei JJK understands her technique’s limitations within hostile domains and adjusts accordingly, either avoiding engagement or exploiting binding vows to punch through barriers when necessary.

She’s also adept at trap solving identifying ambushes, cursed technique mechanics, and environmental hazards through careful observation and logical deduction.

Her risk assessment calculations are ruthlessly accurate. She weighs costs against rewards constantly, determining when to fight, when to retreat, and when to invest resources like Bird Strike.

This analytical mindset extends to interpersonal dynamics; she reads people as effectively as battlefields, identifying leverage points and cultivating relationships like those with Satoru Gojo and Utahime Iori that provide access to lucrative contracts.

Cursed Energy

Whilst Mei Mei JJK doesn’t possess cursed energy reserves comparable to anomalies like Satoru Gojo or Suguru Geto, she demonstrates exceptional cursed energy control and efficiency. Her philosophy mirrors her personality: don’t waste resources, maximize output concentration, and apply force precisely where it matters most.

She employs cursed energy reinforcement across both body and weapon, channelling energy through her battle axe to amplify each strike’s destructive potential.

This reinforcement allows her to cleave through cursed spirits whose durability would otherwise require overwhelming force.

During her battle with the Smallpox Deity, she concentrated cursed energy into targeted blows rather than sustaining constant high output a stamina-preserving approach essential for prolonged operations.

Her technique, Black Bird Manipulation, operates on relatively modest CE upkeep under normal circumstances.

Maintaining control over multiple crows for long-range recon requires steady cursed energy expenditure but nothing extravagant.

However, when executing Bird Strike her devastating finisher energy dynamics shift dramatically due to the binding vow involved, which amplifies output through sacrifice far beyond her natural capacity.

This efficiency-first approach means Mei Mei JJK can operate continuously throughout extended crises like the Shibuya Incident without exhausting herself, maintaining combat readiness whilst others falter.

Mei Mei JJK Cursed Technique

Black Bird Manipulation

Black Bird Manipulation forms the cornerstone of Mei Mei’s combat methodology. The technique grants her control over crows, transforming ordinary birds into extensions of her will.

Through shared vision, she perceives everything her crows observe, effectively creating a multi-point observation network that eliminates blind spots and provides real-time battlefield intelligence.

The versatility of this cursed technique cannot be overstated. For reconnaissance, Mei Mei JJK deploys crows across vast distances demonstrated during the Shibuya Incident when she mapped enemy positions throughout multiple city blocks.

The crows operate independently yet cohesively under remote control, capable of swarm tactics that distract, harass, or herd targets into disadvantageous positions.

Her command range extends far beyond visual distance, allowing her to coordinate operations whilst remaining safely positioned or engaging separate threats simultaneously.

This capability makes her invaluable for missions requiring information gathering, perimeter security, or coordinated multi-target engagements precisely the sort of missions-for-fee she prefers.

The technique’s true lethality, however, emerges not from the crows’ basic utility but from what she can transform them into: sacrificial weapons through Bird Strike.

Bird Strike

Bird Strike represents the apex of Mei Mei’s offensive capability—a technique that converts a single crow into a devastating, domain-piercing projectile through application of a binding vow.

By sacrificing the crow’s life, Mei Mei JJK exponentially amplifies the cursed energy compressed into its final dive-bomb attack, creating a strike capable of heavy single-target damage that punches far above her natural cursed energy output.

The mechanics involve complete energy saturation: the crow becomes a living missile, accelerating to extreme velocity whilst concentrating cursed energy into a singular point of impact.

The resulting collision delivers enough force to wound or eliminate special grade curses, as demonstrated when Mei Mei JJK deployed Bird Strike against the Smallpox Deity during the Shibuya Incident a strike that contributed decisively to the special grade’s exorcism.

What makes this technique particularly dangerous is its target-lock conditions. Once committed, the crow homes in with relentless precision, making evasion difficult even for agile opponents.

The technique’s domain-piercing potential suggests it can breach certain barrier techniques, though this capability depends on the domain’s strength and the specific binding vow parameters.

Binding Vows and Conditions

The binding vow underlying Bird Strike operates on straightforward risk/reward scaling: the permanent sacrifice of the crow amplifies the attack’s power exponentially through a cosmic transaction enforced by jujutsu’s fundamental laws.

This isn’t simply enhanced cursed energy output it’s a fundamental restructuring of the technique’s potential. The crow’s life becomes fuel, and the resulting explosion of cursed energy far exceeds what Mei Mei JJK could generate through conventional reinforcement.

This reliance on binding vows reflects Mei Mei’s broader philosophy. She understands that power demands payment, and she’s willing to pay provided the return justifies the cost. Each crow sacrificed represents a calculated investment: lose one asset, eliminate a greater threat, maintain operational superiority.

The conditions are non-negotiable once established. Mei Mei cannot reclaim a crow mid-strike or reduce energy output to preserve the bird. The vow demands completion, meaning she must be certain of target priority before commitment a requirement that meshes perfectly with her reconnaissance-first methodology.

Weaknesses and Counters

Despite its versatility, Black Bird Manipulation possesses exploitable vulnerabilities. Anti-swarm tactics and area-of-effect attacks can devastate her crow network before reconnaissance yields value.

A sufficiently powerful blast fire, wind, or explosive cursed techniques can eliminate multiple crows simultaneously, blinding Mei Mei JJK and forcing her into reactive combat.

Domains that block external shikigami represent another hard counter. If a cursed spirit or sorcerer erects a domain preventing outside entities from entering, Mei Mei loses her reconnaissance advantage and must rely solely on physical combat capabilities.

This vulnerability makes her cautious about engaging domain users without prior intelligence or backup typically Ui Ui, whose support compensates for her technique’s limitations.

Enclosed spaces restrict the crows’ mobility and observation angles, reducing the effectiveness of swarm tactics and multi-point observation. 

Anti-recon measures such as cursed techniques that obscure vision or disrupt shared vision links can also degrade her information advantage, forcing Mei Mei JJK to operate with incomplete data.

Finally, Bird Strike, whilst devastating, requires sacrificing resources. Prolonged battles demanding multiple uses can deplete her crow supply, leaving her without reconnaissance or her primary finisher when subsequent threats emerge.

Fighting Style and Tactics

Mei Mei JJK’s combat methodology prioritizes information asymmetry and surgical strikes. She rarely engages without first conducting off-site recon, deploying crows to identify enemy numbers, capabilities, and positioning.

This intelligence phase allows her to isolate targets, identify escape routes, and coordinate with allies most frequently Ui Ui before committing to direct confrontation.

Her preferred tactic involves crow bait followed by axe finisher: crows harass and distract whilst she closes distance, then delivers a cursed-energy-reinforced battle axe strike to vulnerable points identified during observation.

If the target proves resilient, she escalates to Bird Strike, sacrificing a crow to eliminate the threat decisively.

She excels at exploiting blind spots both literal and tactical. Her crows reveal enemy weaknesses, and she attacks from unexpected angles, using terrain, structure, and timing to maximize each blow’s effectiveness.

This approach mirrors her personality: efficient, ruthless, and entirely focused on achieving objectives with minimum resource expenditure.

When supporting allies, Mei Mei JJK provides reconnaissance coverage that transforms chaotic battlefields into manageable tactical scenarios. During the Shibuya Incident, her intelligence network guided other sorcerers through the barrier segmented city, demonstrating her value extends beyond personal combat prowess.

Notable Feats

Mei Mei’s most significant accomplishment remains her defeat of the Smallpox Deity, a special grade cursed spirit manifested during the Shibuya Incident. The Smallpox Deity, conjured under Kenjaku’s orchestration, possessed disease-based cursed techniques and formidable durability.

Mei Mei JJK, alongside Ui Ui, engaged the entity within confined subway environments, utilizing Bird Strike to pierce its defenses and ultimately exorcise it—a feat cementing her reputation as a legitimate special-grade-level threat despite her Grade 1 classification.

Her city-scale reconnaissance during Shibuya demonstrated operational capability few sorcerer’s match.

Whilst others fought blindly within Kenjaku’s barriers, Mei Mei’s crows mapped the battlefield, tracked curse movements, and provided intelligence that saved lives and enabled strategic adjustments.

Her domain counterplay evading or negating hostile domains through tactical positioning and binding vow exploitation showcases technical sophistication born from experience and study. She doesn’t overpower domains; she outthinks them.

Equipment

Mei Mei’s battle axe serves as her primary weapon, a brutal instrument perfectly suited to her direct combat style.

The axe features an oversized blade capable of delivering devastating strikes when reinforced with cursed energy. Its design prioritizes function over form no unnecessary ornamentation, just efficient lethality.

She also carries standard communication gear, including smartphones and specialized equipment for coordinating with Ui Ui and contractors during complex operations.

Her gloves and boots are combat-grade, providing protection and grip during acrobatic manoeuvres whilst maintaining the sleek aesthetic she favours.

Unlike technique-reliant sorcerers, Mei Mei’s equipment reflects her hybrid approach: physical prowess backed by tactical cursed technique application.

Mei Mei JJK Relationships

Family

Ui Ui, Mei Mei’s younger brother, represents her most significant personal relationship. Their bond is uncomfortably close, with Ui Ui displaying near-fanatical devotion and Mei Mei JJK responding with genuine if manipulative affection.

He serves as her assistant during missions, provides logistical support, and enhances her operational effectiveness through his own cursed technique capabilities.

The relationship raises eyebrows within jujutsu society, but Mei Mei’s protectiveness towards Ui Ui is unquestionable.

She prioritises his safety, includes him in her evacuation to Hong Kong post-Shibuya, and treats him as her most trusted ally. Whatever the psychological complexities, their partnership functions with ruthless efficiency.

Allies and Affiliations

Mei Mei JJK maintains professional peer relationships with several prominent sorcerers, most notably Satoru Gojo and Utahime Iori.

Her connection to Gojo appears cordial, rooted in mutual respect between elite combatants, though she’s under no illusions about his overwhelming superiority. With Utahime, she’s collaborated on investigation missions, including assignments during the Hidden Inventory era.

Her ties to Tokyo Jujutsu High remain active despite her freelance status. She accepts contracts from the institution and Jujutsu Headquarters when terms prove favorable, maintaining alumni connections that provide steady income streams.

Her client base extends across jujutsu society, encompassing anyone willing to meet her fees. This mercenary approach ensures she’s never entirely beholden to any single faction a deliberate strategy that maximizes autonomy.

Rivals and Enemies

Mei Mei’s transactional nature means she accumulates few personal enemies, but her involvement in the Shibuya Incident placed her in direct opposition to Kenjaku (also known as Pseudo-Geto) and the curses under his command.

Her exorcism of the Smallpox Deity marked her as a significant obstacle to his plans, though whether Kenjaku considers her a priority threat post-evacuation remains unclear.

Beyond specific individuals, she’s opposed to various Shibuya Incident curses and any threat that interferes with profitable operations. However, Mei Mei JJK doesn’t cultivate rivalries—they’re inefficient and rarely lucrative.

Plot

Pre-Series

Mei Mei JJK established her reputation through early freelance missions across Japan, building a client base and demonstrating the reliability that would define her career.

Her alumni-era ties to Tokyo Jujutsu High provided initial connections, though she diverged from the institutional path early, prioritising independence over advancement within jujutsu hierarchies.

Hidden Inventory/Premature Death Arc

During this period, Mei Mei JJK conducted investigation missions alongside Utahime Iori, including a notable assignment investigating a haunted site.

This arc provided an early showcase of her reconnaissance and analysis capabilities, demonstrating her methodical approach to threat assessment and her willingness to collaborate when contracts demanded it.

Her presence during this era places her amongst the generation that witnessed Satoru Gojo’s evolution into the strongest sorcerer and Suguru Geto’s eventual defection—events that reshaped jujutsu society’s power dynamics.

Shibuya Incident Arc

The Shibuya Incident represents Mei Mei’s most significant canonical appearance. Contracted to assist with the crisis, she deployed her crows for reconnaissance across Shibuya, mapping the barrier-segmented battlefield and tracking curse movements. Her intelligence proved invaluable to overall coordination efforts.

She engaged the Smallpox Deity in direct combat alongside Ui Ui, ultimately neutralizing the special grade threat through strategic application of Bird Strike. Following the cursed spirit’s exorcism, Mei Mei JJK fulfilled her contractual obligations before making a calculated decision: strategic retreat and overseas exit.

Recognising that the Shibuya barriers collapse and Kenjaku’s machinations presaged catastrophic destabilisation, she evacuated Japan entirely with Ui Ui, relocating to Hong Kong to continue operations far from the escalating chaos.

Post-Shibuya and Aftermath

Following her departure from Japan, Mei Mei JJK established overseas operations base, maintaining distance from the Culling Game and other consequences of Kenjaku’s plans. Her current activities remain largely off-screen, though her survival instincts and resource network suggest she’s thriving in new markets.

Culling Game Arc

Mei Mei JJK’s status during the Culling Game remains largely off-stage, with her overseas position insulating her from direct involvement.

Whether she’s monitoring events for potential profit opportunities or maintaining strategic distance remains unclear, but her absence from Japan suggests she’s calculated that the risks outweigh potential rewards at least for now.

Battles & Events

Notable Battles

Mei Mei & Ui Ui vs Smallpox Deity (Shibuya) stands as her defining combat engagement. The battle showcased her complete tactical repertoire: crow reconnaissance to map the cursed spirit’s capabilities, coordinated attacks with Ui Ui, and decisive deployment of Bird Strike to pierce the special grade’s defences.

The victory cemented her reputation whilst demonstrating the lethal effectiveness of her deceptively simple cursed technique.

Major Events and Outcomes

Her reconnaissance across Shibuya provided critical intelligence throughout the incident, guiding sorcerer movements and identifying threats before they could ambush unprepared allies.

The neutralization of the special grade Smallpox Deity removed a significant threat from the battlefield, potentially saving numerous lives.

Her evacuation and exit from Japan represent perhaps her most characteristic decision: recognizing an untenable situation, fulfilling contractual obligations, then prioritizing survival and future profitability over continued engagement in a losing scenario.

Quotes

“I only work for money.” — Mei Mei’s philosophy distilled to its essence, reflecting her transactional worldview.

“Ui Ui is my favourite.” — One of the few glimpses into genuine affection beneath her mercenary exterior, revealing the protective devotion she feels toward her younger brother.

Her dialogue throughout the series maintains professional detachment punctuated by occasional displays of satisfaction when deals prove profitable or battles conclude efficiently.

Mei Mei JJK Voice Actors

Japanese

Kotono Mitsuishi provides Mei Mei’s Japanese voice, bringing sophisticated menace and calculated charm to the character’s dual nature.

English

Amber Lee Connors voices Mei Mei in the English dub, capturing both her professional polish and underlying ruthlessness.

Trivia

• Mei Mei’s name can be written with kanji meaning “younger sister” (妹), creating ironic contrast with her role as older sibling to Ui Ui.
• Her money motif extends beyond personality—her fees and commissions are explicitly discussed in-series, unusual transparency for a protagonist-adjacent character.
• The battle axe as signature weapon distinguishes her from technique-reliant sorcerers, emphasising her hybrid combat approach.
• Crow symbolism in Japanese folklore often associates the birds with divine messengers or omens, adding thematic depth to her cursed technique choice.
• Her popularity spiked significantly post-Shibuya Incident anime adaptation, with cosplay and merchandise trends reflecting increased fan interest.

References

This article draws from:

• Jujutsu Kaisen manga chapters covering the Hidden Inventory Arc and Shibuya Incident Arc
• Jujutsu Kaisen Season 2 anime episodes adapting these arcs
• Official character guidebooks and databooks
• Canonical interviews with series creator Gege Akutami

Specific chapter and episode citations available upon request for academic or editorial purposes.

Navigation

Utahime Iori: Complete Biography & Role in JJK

Frequently Asked Questions

How old is Mei Mei in JJK?
Mei Mei JJK’s exact age is never confirmed in Jujutsu Kaisen, though she appears to be in her late twenties and was active during Gojo and Geto’s student era.

What is Mei Mei and Ui Ui’s relationship?
Ui Ui is Mei Mei’s younger brother; they share an uncomfortably close, codependent bond with Ui Ui displaying near-fanatical devotion and Mei Mei being fiercely protective in return.

What does Mei Mei mean?
The kanji 冥冥 can relate to “darkness” or “the unseen,” though ironically her name sounds like 妹 (younger sister) despite her being the older sibling.

What is Mei Mei known for?
Mei Mei is known for her Black Bird Manipulation cursed technique, her mercenary approach to jujutsu work, and defeating the Smallpox Deity during the Shibuya Incident.

Who is Mei Mei to Gojo?
Mei Mei is a professional peer and fellow Grade 1 sorcerer (later Special Grade-level threat) with alumni connections to Tokyo Jujutsu High; they maintain mutual respect without close personal ties.

Who has a crush on Mei Mei?
Ui Ui, her younger brother, displays intense devotion that borders on romantic obsession, though the series presents this dynamic as deliberately uncomfortable rather than reciprocated attraction.

What is mei fun?
Mei fun is a Chinese rice noodle dish—unrelated to the Jujutsu Kaisen character Mei Mei.

What is chow mei fun?
Chow mei fun is stir-fried rice noodles, a Cantonese dish—also unrelated to the JJK character.

Conclusion

Mei Mei in JJK stands apart as one of Jujutsu Kaisen’s most pragmatic and morally complex characters. Whilst protagonists like Yuji Itadori fight for noble ideals and villains like Kenjaku pursue grand ambitions, she operates in the grey zone driven by money, guided by logic, and utterly unashamed of either.

Her Black Bird Manipulation technique, though deceptively simple, becomes devastatingly effective through tactical intelligence and creative exploitation of binding vows, proving that raw power matters less than how it’s applied.

Her defeat of the Smallpox Deity during the Shibuya Incident cemented her status as an elite combatant, yet her most defining moment came immediately after: the calculated decision to evacuate Japan entirely. Survival over heroism. Profit over ideology. That’s Mei Mei from JJK in essence.

She challenges the series’ typical sorcerer archetypes, demonstrating that you needn’t be selfless to be competent, nor ruthless to be reliable.

In a world where idealism often leads to death, Mei Mei JJK thrives precisely because she never pretended to care about anything beyond her next contract—and her brother Ui Ui. That brutal honesty, paradoxically, makes her one of jujutsu society’s most dependable professionals.