Mizai Istom

Biodata

Feature	Information
Name	Mizai Istom (米才伊史多姆)
Alias(es)	Mizaistom Nana; Ox
Gender	Male
Affiliation	Hunter Association; Twelve Zodiacs
Occupation/Role	Two-Star Crime Hunter; Zodiac; later Vice Chairman and administrator entrusted with the Hunter Association's day-to-day internal management 16 342
First Appearance	Chapter 16 16
Status	Active
Nen Ability	Closed-Room Judgment; Yellow Card Warning 16
Other Professional Role	His business card identifies him as an attorney for a private security company 19

Background / History

Mizai Istom first intervenes during the conflict with the Voldek Family and the Cleaners. Using Closed-Room Judgment—Yellow Card Warning, he freezes the fleeing Terrence and asserts custody over him for his confirmed crimes, establishing his preference for lawful arrest and trial over summary execution 16.

He has already been observing from a tree before Leo enters the battle, initially withholding intervention to confirm the combatants' identities and assess Leo's unexpected strength. After learning that Leo and Goreinu deliberately publicized information about the Cleaners to attract his attention, he agrees to cooperate on the condition that subsequent operations remain legal and follow his commands 16.

After conventional interrogation fails to make Terrence reveal the Cleaners' hideout, Mizai refuses Leo's offer to use violent methods. He subsequently leads the raid planning, assigns himself to restrain Doctor and Iron Wall, and asks Leo to preserve Doctor for legal punishment if possible 17. Following the raid, Mizai organizes the rescue and cleanup effort for the laboratory's surviving victims 18.

Recognizing Leo's potential, Mizai encourages him to enter the Hunter Association and later recruits him for operations against criminal groups, including the Jackal Trio and the missing transport-team case on Estan Island 18 34 56. His continued work with Leo develops into a relationship of trust, though Mizai repeatedly objects to Leo's willingness to kill suspects 38 56.

His initial invitation to join the Association also reflects caution: his investigation uncovers no information about Leo's background, and he considers an unaffiliated Nen user of such strength a potential social danger. Bringing Leo into the Association offers a means of supervision as well as professional guidance 18. He later attends Leo's One-Star advancement ceremony, praises his criminal-hunting record, and joins the subsequent celebration 52. In December 1998, he invites Leo to serve as an examiner for the following January's Hunter Exam, citing his exceptional strength and rapid advancement to Two-Star Hunter 100.

When evidence suggests that Doctor has support within the Hunter Association, Mizai investigates the internal mole under Chairman Netero's authorization. His file review finds no clear suspect, but he accompanies Leo and Kalluto Zoldyck when Kalluto's paper doll tracks the traitor to Brennan Ford 130 131 135 136. Mizai is personally distressed by Brennan's betrayal and formally reports the matter to Netero 136 139.

During Brennan's interrogation, Mizai learns that Doctor obtained his cooperation by promising to cure his terminally ill daughter, Nina, in exchange for Association intelligence and assistance 137. He also participates in questioning Asher after Leo breaks the teleportation user's resistance, reacting with mixed emotions to the effects of Leo's methods 144.

Mizai joins the assault on Doctor's island base. He fights alongside Kastro against Ivan, Gleb, and their guards, but Ivan's ranged aura bullets prevent him from closing in to use his ability effectively 150 153. After Doctor's death, he handles the operation's reports and cleanup while continuing to support Leo's efforts against the Association's deeper corruption 162 269.

The official report he prepares states that Doctor's base self-destructed, destroying its personnel and evidence. This fabricated account conceals the operation's actual details and protects the participating Hunters. He subsequently informs Leo that Netero has decided to close the matter officially, while quietly supporting Leo's refusal to abandon the pursuit of Doctor's backers 162.

When Leo later asks for help locating Nina so that he can cure her, Mizai expresses relief at Leo's continued commitment to helping others 244. His investigation into Pariston uncovers a telephone call with Sterling, who later appeared in the desert where Jade died; Mizai warns that Sterling's records require high-level clearance and that careless investigation could alert him 269. He also sends Leo instructions for a mysterious commission at the Oukima Federation's Diplomatic Licensing Hall 276.

After Leo assumes the Hunter Association chairmanship, Mizai is given authority over its daily internal affairs and the selection of new Zodiac candidates 342. He later oversees administrative duties during passenger disputes on the voyage toward the Dark Continent 415.

Between these developments, Mizai participates in the response to Kakin's expedition announcement, personally places Beyond Netero in handcuffs after his voluntary surrender, and works with Cheadle to draft the Association's expedition procedures and Hunter Exam reforms 343 346 356. As departure approaches, he reports directly to Leo on arrangements involving Beyond and the Kakin princes' recruitment of guards, and receives a teleportation medium before Leo leaves 394.

Appearance

Mizai is a stern-looking man who usually presents himself with meticulous professional formality. He wears a black suit, white shirt, and impeccably neat tie; his sharp eyes are compared to an eagle's 16.

• Stern facial features and a composed expression 16.
• Usually dressed in formal business attire 16 36.
• Wears glasses; he adopts rimless glasses while undercover at the Minke Building exhibition 36.

Personality

Mizai is defined by fairness, rigor, and a strong belief that criminals should face lawful judgment. He insists on taking Terrence into custody and repeatedly seeks to preserve targets for trial rather than execution 16 17.

He is highly professional and methodical, carefully reviewing intelligence, inspecting venues for infiltration routes, and prioritizing civilian safety during operations 35 36. Although his principles make him uncomfortable with Leo's brutal interrogations and lethal methods, he can adapt when confronting an enemy base full of armed personnel and human-experimentation staff 143 149.

Despite his reserved demeanor, Mizai respects Leo's resolve to protect others and supports him in pursuing corruption within the Association 19 162.

His pragmatism does not eliminate his discomfort. During the assault on Doctor's base, he concludes that insisting on nonlethal methods would endanger his companions, then personally kills armed guards despite sighing at the necessity 149 151. He likewise accepts the political need for a false official report, though the cover-up and Netero's decision to end the investigation burden him 162.

Mizai is considerate toward those he recruits. When requesting Leo's help on Estan Island, he explicitly states that the assignment is voluntary and that refusing would be understandable. Before departure, he warns Leo to withdraw rather than gamble with his life if the threat proves unmanageable 56 57.

He retains his composure under political pressure. When Beyond predicts that he will be released and that the Zodiacs will accompany him to the Dark Continent, Mizai's expression remains steady rather than reflecting the surprise of the observers 346.

Abilities & Skills

Closed-Room Judgment

A Nen ability that establishes rules and forcibly enforces them. Mizai uses a yellow-card warning to restrain violations or immobilize targets.

• Yellow Card Warning — A yellow curtain of light freezes Terrence in place while he is attempting to flee 16.
• Can restrain opponents such as Iron Wall, whose armor reflects physical attacks 17.
• Successfully captures Iron Wall during the Cleaners' laboratory raid 18.
• Requires Mizai to close distance before it can be used effectively; Ivan's long-range aura bullets repeatedly prevent him from approaching 153.
• During the fight with Ivan, Mizai produces a yellow card after reaching approximately three meters from his opponent, but a large aura projectile forces him to abandon the attempt. This encounter does not establish an exact maximum activation range 153.

Physical Combat and Aura Defense

Mizai possesses combat skills beyond his rule-enforcement ability.

• Kills armed guards with precise neck-breaking attacks while advancing through Doctor's base with Kastro 151.
• Dodges Ivan's sustained aura-bullet barrages with carefully timed movements and repeatedly attempts to close the distance 153.
• His aura defense withstands the guards' ordinary gunfire during the battle with Ivan and Gleb 153.
• Ivan's larger aura projectile grazes his shoulder, and the resulting rubble strikes him hard enough to make him stagger 153.
• His direct physical attacks are insufficient against Doctor's transformed body: a punch to one of her tentacles leaves only a faint white mark 158.

Investigation and Operational Planning

Mizai is an experienced Crime Hunter with strong investigative and coordination skills.

• Tracked the Jackal Trio for three months before organizing a rapid arrest operation 34.
• Inspects locations for emergency exits, ventilation routes, assault paths, and possible escape routes 36.
• Reviews Association personnel records while investigating internal corruption 135.
• Handles reports, evidence, logistics, and post-operation cleanup for major Hunter Association cases 18 139 162.
• Provides Leo with Estan Island intelligence, contact codes, supplies, and transportation arrangements, while identifying the mission's B+ danger rating 56 57.
• Investigates politically sensitive connections between Pariston and Sterling while accounting for clearance restrictions and the risk of alerting the subject 269.
• Evaluates contradictory passenger and witness accounts during disputes aboard the expedition vessel 415.

Administration and Legal Coordination

Mizai's responsibilities extend from criminal investigation to institutional management.

• Prepares materials for hearings and attends a joint V5 hearing that prevents him from personally investigating Estan Island 56 101.
• Receives authority to resolve internal Association matters in Leo's absence, escalating only problems he cannot handle 342.
• Selects candidates for vacant Zodiac seats, with the final list subject to Leo's approval 342.
• Works with Cheadle on Beyond's monitoring procedures, voyage authority, information-control rules, and recruitment-focused Hunter Exam reforms 356.
• Coordinates field operations with Kastro 387.
• Reports expedition scheduling and politically sensitive requests directly to the Chairman 394.

Power Progression

Stage / Event	Demonstrated Ability or Development	Limitations / Outcome	Chapter(s)
First intervention against the Cleaners	Uses Closed-Room Judgment—Yellow Card Warning to immobilize Terrence during his escape	Establishes his rule-enforcement ability; no awakening or training milestone is shown	16
Cleaners' laboratory raid	Uses Closed-Room Judgment to capture Iron Wall	Demonstrates restraint against an opponent whose armor reflects physical attacks	17 18
Advance through Doctor's base	Kills armed guards with precise close-combat attacks	Applies lethal force after accepting its necessity for the team's safety	149 151
Battle against Ivan	Dodges aura bullets, withstands ordinary gunfire with aura defense, and produces a yellow card at close range	Ivan's ranged suppression prevents successful activation; a larger projectile and debris disrupt Mizai's approach	153
Defense against transformed Doctor	Attempts to repel a tentacle with a Nen-supported punch	Leaves only a faint mark and is forced into a defensive struggle; no new ability or power increase is established	158

Relationships

• Leo — Trusted ally and frequent field partner. Mizai recruits Leo for criminal-hunting operations, values his strength, and is entrusted with internal investigations and Association administration; he remains critical of Leo's lethal methods 34 38 130 342. He attends Leo's One-Star ceremony, invites him to become a Hunter Exam examiner, and is reassured when Leo offers to cure Nina 52 100 244.
• Kanzai — Fellow Zodiac and partner in the Jackal Trio operation. Their contrasting temperaments occasionally create friction, but Mizai coordinates their work effectively 35 36.
• Chairman Netero — Mizai reports major Association threats to Netero, who grants him responsibility and access to Association resources for the Doctor investigation 131 139. Netero's refusal to provide more direct guidance frustrates him, and he later conveys the Chairman's decision to close the Doctor case officially 139 162.
• Kastro — Field partner during the raid on Doctor's underground base; the two confront Ivan and Gleb together 150 153. After Kastro joins the Zodiacs, he works with Mizai on field coordination 342 387.
• Sophia — Leo's disciple, whom Mizai meets during Leo's One-Star advancement and recognizes as capable in her own right 52. She later joins the Zodiacs during Mizai's tenure overseeing internal administration 342.
• Cheadle — Fellow Zodiac and administrative collaborator. They lead the drafting of expedition procedures and Hunter Exam reforms, and both face increasing workloads during the voyage 356 415.
• Kalluto Zoldyck — Assists the internal mole investigation with a tracking paper doll after Mizai's personnel review fails to identify a suspect 135 136.
• Goreinu — Cooperates with Mizai and Leo in interrogating Terrence and planning the Cleaners' hideout raid 17.
• Brennan Ford — Former colleague whose connection to Doctor deeply disappoints Mizai 136. Mizai hears Brennan's explanation that his betrayal was motivated by Doctor's promise to cure Nina, and Leo later asks him to help locate her 137 244.
• Doctor — Long-term criminal target responsible for human experimentation. Mizai seeks to arrest her and expose the organization behind her 17 130.
• Pariston Hill — A figure Mizai considers suspicious due to the sharp increase in Hunter disappearances after Pariston became Vice Chairman 130 269. His investigation later uncovers Pariston's contact with Sterling, and he recognizes the depth of Pariston's institutional influence during the Beyond crisis 269 344.
• Hisoka — A notorious killer whose inclusion in the Estan Island mission Mizai accepts out of trust in Leo's judgment 57. They later participate in the same assault on Doctor's base 147 158.
• Beyond Netero — Expedition leader whom Mizai personally handcuffs after his voluntary surrender. Mizai subsequently helps establish procedures for monitoring him during the voyage 346 356.

Story Role / Major Arcs

Cleaners Case

Mizai arrests Terrence, plans the raid on the Cleaners' hideout, confronts the laboratory's operators, and oversees survivor rescue efforts 16 18. The case establishes his partnership with Leo and their fundamental disagreement over justice and killing 17 19.

He personally captures Iron Wall and arranges Association assistance for the surviving experimental subjects and the processing of corpses 18. His invitation for Leo to become a Hunter begins as both an acknowledgment of Leo's potential and an attempt to place a powerful, unknown Nen user under institutional supervision 18.

Jackal Trio Hunt

As team leader, Mizai organizes the operation with Leo and Kanzai, scouts Minke Building, and prioritizes a coordinated arrest that protects exhibition visitors 35 36. He later disapproves when Leo kills Jackal and Fire Wolf instead of taking them into custody 38.

After the operation, Mizai and Kanzai escort the unconscious Coyote to the Association's underground detention center, a facility equipped to hold dangerous Nen users 39.

Estan Island Assignment

With the other Zodiacs occupied and his own schedule committed to a V5 hearing, Mizai asks Leo to investigate the disappearance of Kam's transport team. He emphasizes that the mission is voluntary and arranges the necessary intelligence, vessel, and equipment 56.

Before Leo and Hisoka depart, he confirms the B+ danger rating, accepts Leo's choice of companion, and instructs them to retreat and contact the Association if necessary 57. The scepter fragments collected after this incident later become a crucial lead in the investigation of Doctor's access to Association intelligence 130.

Doctor Conspiracy Investigation

Mizai investigates Doctor's links to the Hunter Association and V5 after Leo presents evidence of a mole, biological-weapon research, and an underground island facility 130. He receives Netero's authorization to mobilize Association resources, participates in exposing Brennan Ford, and reports the betrayal to the Chairman 131 136 139.

Brennan's confession reveals how Doctor exploited his daughter's illness to obtain information and assistance 137. Mizai subsequently questions Asher after Leo's interrogation methods break his resistance, helping the group obtain the information needed to reach Doctor's base 144 147.

Assault on Doctor's Base

Mizai accompanies Leo's team to Doctor's island base, accepts the necessity of lethal force against its personnel, and fights through the underground facility with Kastro 147 149 153. He survives Doctor's counterattack and later manages the aftermath of the operation 158 162.

Before the assault, he warns Leo about the facility's hundreds of armed personnel, Nen users, experimental subjects, and possible hidden defenses. Once the group enters, he proposes splitting up to prevent Doctor's escape and takes the far-left passage with Kastro 148 150. Their fight with Ivan and Gleb highlights the difficulty of applying his close-range ability against coordinated ranged suppression 153.

His post-operation report presents the base's destruction as a self-destruction event. The resulting official closure does not end his cooperation with Leo, and he later continues investigating Pariston's suspicious connections 162 269.

Hunter Association Administration

Following Leo's election as Chairman, Mizai becomes responsible for the Association's daily internal management and for recommending candidates to fill vacant Zodiac seats 342. He also participates in the Zodiac response to Kakin's Dark Continent declaration 343. During the voyage toward the Dark Continent, he assists with mediating passenger disputes and managing ongoing crisis logistics 415.

His delegated authority makes him the primary point of contact when Leo is absent. Sophia and Kastro subsequently fill the two Zodiac vacancies, with Kastro later working alongside Mizai on field coordination 342 387.

Dark Continent Expedition Preparations

Mizai responds to Kakin's announcement by explaining the V5 prohibition on Dark Continent expeditions and the history of disasters associated with previous contact 343. As Beyond's plans become clearer, he recognizes that Pariston's deep-rooted influence was part of a longer preparation rather than a sudden political move 344.

He personally restrains Beyond after his surrender and remains composed when Beyond predicts both his release and the Zodiacs' participation in the expedition 346. Mizai and Cheadle then translate the Association's agreements into practical rules covering surveillance, command authority, information control, and an expanded Hunter Exam designed to recruit specialists for the voyage 356.

Thirty days before the scheduled August 8 departure, he briefs Leo on Nasubi's request for Beyond to attend the pre-departure banquet and sailing ceremony, as well as the princes' recruitment of guards. Leo approves Beyond's attendance and declines to direct Hunters into the princes' service, leaving participation voluntary 394.

Voyage Crisis Management

As the voyage progresses, reports of collapsed passengers, violent disputes, and disappearances increase, stretching Mizai, Cheadle, and their colleagues' manpower and energy. Mizai continues handling individual cases by comparing conflicting testimony and extracting reliable information from inconsistent accounts 415.

Notable Quotes

“My duty is to arrest the Cleaners' members and have them stand legal trial...” 17

“We can't save everyone, but we can stand up for every person who needs help. That is enough.” — Leo to Mizai, affirming the resolve behind his work. 19

“The Chairman said I have full responsibility. All the Association's resources can be mobilized.” 131

“But I must warn you: this mission has a B+ danger rating. If you encounter something you can't handle, withdraw and contact the Association. Don't push your luck.” 57

“All right. Good luck—don't do anything reckless.” 394

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