Kastro

Biodata

Feature	Details
Name	Kastro
Alias(es)	“White Robe”; Doulang 117 208
Gender	Male
Affiliation	Leo's team; Heart Source School; Hunter Association; later one of the Zodiacs 100 115 387
Occupation/Role	Heaven's Arena Floor Master; Hunter; field operative under Mizai Istom 170 387
Status	Active
First Appearance	Chapter 55

Power Progression

Stage / Realm / Level	Chapter	Notes
Tiger Fang Fist martial artist	55	Reached Heaven's Arena's 200th Floor undefeated, but did not understand Nen and was defeated by Hisoka's Nen-enhanced counterattack.
Systematic Nen training	100	Leo corrected his foundation over three months, teaching the Four Major Principles, advanced techniques, and an Enhancement-suited personal ability.
Heaven's Arena Floor Master	170	Achieved ten wins, defeated a Floor Master, and secured a Floor Master position before arranging a rematch with Hisoka.
Tiger-Pattern Battle Body and Tiger Roar	208–210	Used his physical-enhancement Hatsu, long-range Tiger Bite attacks, and the aura-based mental shock of Tiger Roar to defeat Hisoka.
Level-panel recipient	270	Leo granted Kastro the ability to level up, though the power can be revoked by Leo.
Eligible for Two-Star Hunter promotion	327	Qualified through his contributions during the Chimera Ant Incident, though he did not complete the certification at that time.

Background

Kastro first entered Heaven's Arena as an undefeated rookie who had fought his way from the first floor to the 200th Floor. His Tiger Fang Fist Style gave him solid fundamentals, speed, and powerful attacks, but he had no understanding of Nen. Hisoka defeated him with a single Nen-enhanced punch after redirecting Kastro's Tiger Bite Fist. 55

After training alone in Thousand-Needle Forest Valley, Kastro encountered Leo and challenged him to a spar. Leo offered to train with him for a month if Kastro could endure one punch; otherwise, Kastro would join Leo's team. Kastro accepted, was knocked unconscious by Leo's counterattack, and honored the agreement upon waking. 99 100

Leo trained Kastro for three months, replacing his unfocused development with systematic Nen instruction. Under this guidance, Kastro abandoned the ill-suited Double ability he would otherwise have developed and created an Enhancement-oriented ability that suited his natural strengths. He formally addressed Leo as his master before returning to Heaven's Arena. 100

Kastro later passed the Hunter Exam, defeated Hanzo in the final phase, and became an official Hunter alongside Nico. He immediately reaffirmed his goal of becoming a Heaven's Arena Floor Master. 115 117

Appearance

Kastro is a lean but sturdy young man with short silver hair, sharp eyes, and a composed bearing. He is strongly associated with white clothing, earning the Heaven's Arena epithet “White Robe.” 55 99 208

• Silver hair and handsome features. 55
• Usually wears a white robe or white martial arts uniform. 55 208
• Maintains a lean, muscular build refined through wilderness training and combat. 99 100
• Carries himself with calm, steady movements even before a fight. 55 208

Personality

Kastro was initially confident to the point of underestimating stronger opponents. His loss to Hisoka and immediate defeat by Leo humbled him, but he accepted both losses without making excuses and treated his agreement with Leo as binding. 55 99 100

Under Leo's instruction, he became disciplined, hardworking, and focused. He trains earlier and rests later than his teammates, approaches combat seriously, and is willing to take responsibility for others' development. 101 165

He is also straightforward and decisive. When Goreinu brought him the dangerous Carlson Family commission, Kastro assessed the political backing behind the target and accepted the job without hesitation. 174

Abilities & Skills

Tiger Fang Fist Style

Kastro's core martial art imitates the agility and ferocity of a hunting tiger. It combines claw-like hand forms, rapid combinations, deceptive angles, and sudden explosive attacks. 55

• Uses dense, irregular barrages to mix direct strikes with feints. 55
• Includes Tiger Bite Fist, a full-force pouncing claw attack intended to overwhelm an opponent's guard. 55
• His close-range attacks target vital points with speed and precision. 177

Nen Control

Leo trained Kastro in the Four Major Principles and advanced Nen applications, transforming him from a novice into a capable Enhancement-type combatant. 100

• Maintains Gyo in battle to identify concealed aura and avoid Hisoka's traps. 209
• Uses Ko to concentrate aura for defense, notably enduring Sabu's point-blank Nen bullets. 246
• Can reinforce his body enough to deflect or withstand firearm rounds while protecting allies behind him. 286

Tiger-Pattern Battle Body

Kastro's personal Enhancement ability manifests tiger-like stripes across his body and pushes him into a short-lived peak combat state. 209

• Enhances physical strength, speed, and close-quarters pressure. 209
• Accelerates self-healing and recovery from injuries. 209 246
• Produces enough speed to leave afterimages while circling an opponent. 209
• Allows Tiger Bite Fist to be projected as the long-range Tiger Bite Cannon Fist. 209
• Consumes substantial aura, especially when injuries force the ability to heal him; prolonged use can leave his aura nearly depleted. 210

Tiger Roar

A final effect of Tiger-Pattern Battle Body activated when Kastro's aura is close to exhaustion. 210

• Releases aura-based soundwaves in a radius of roughly ten meters. 210
• Temporarily shocks the target's mind, causing stiffness and a momentary lapse in control. 210
• Kastro used the opening created by Tiger Roar to land the decisive blow against Hisoka. 210

Equipment / Items

• Hunter License — Obtained after passing the Hunter Exam. 117
• Gas mask — Carried during the Heaven's Arena crisis to bypass gas released into the corridors. 262
• Greed Island clearance binder — Used to bring Breath of the Archangel, Witch's Rejuvenation Potion, and Floating Stone back to the real world on Leo's instructions. 251

Relationships

• Leo — Master and team leader. Leo defeated Kastro, taught him Nen, guided his combat development, and later entrusted him with training Gon and Killua. 100 165
• Hisoka — Rival. Hisoka's early victory exposed Kastro's lack of Nen knowledge; after over a year of training, Kastro defeated him in their Floor Master rematch. 55 208 211
• Nico — Teammate and fellow Hunter Exam candidate. They trained together at Heaven's Arena, passed the Hunter Exam together, and cooperated in mafia and Greed Island operations. 101 117 176 251
• Goreinu — Teammate and frequent combat partner. They worked together in the Carlson Family ambush, Chimera Ant operations, and Greed Island. 174 177 251 287
• Sophia — Fellow disciple in Leo's team. She trained and sparred with Kastro at Heaven's Arena and supported him during his match against Hisoka. 101 208 211
• Gon and Killua — Trainees entrusted to Kastro by Leo. Kastro repeatedly sparred with them, defeating them without Nen while helping them improve their coordination and endurance. 165
• Ponzu — Rescued by Kastro during the Chimera Ant crisis. He shielded her from gunfire and killed the Chimera Ant pursuing her. 286
• Kite — Field commander during part of the Chimera Ant campaign. Kastro accepted Kite's leadership when Leo assigned the team to him. 301

Story Role / Major Arcs

• Heaven's Arena debut — Faces Hisoka on the 225th Floor, displays Tiger Fang Fist Style, and suffers a decisive loss due to his ignorance of Nen. 55
• Leo's disciple — Challenges Leo in Thousand-Needle Forest Valley, loses in one blow, joins Leo's team, and receives three months of intensive Nen training. 99 100
• Hunter Exam — Enters the exam with Nico, defeats Hanzo in the final test, and obtains a Hunter License. 102 115 117
• Heaven's Arena rematch — Becomes a Floor Master and defeats Hisoka using Tiger-Pattern Battle Body and Tiger Roar, finally repaying the punch that began his pursuit of strength. 170 208 211
• Carlson Family operation — Joins Goreinu and Nico in an ambush on a mafia convoy, rapidly incapacitating armed escorts and their Nen user. 174 177
• Greed Island — Leads his group through the collection of all 99 specified cards, clears the game, and retrieves three assigned cards for Leo. 231 251
• Heaven's Arena crisis — Confronts Asura in the main control room while attempting to restore the arena's security system. 262
• Chimera Ant Incident — Saves Ponzu, leads ant-purge operations with other Hunters, and participates in the ambush against six Squadron Leaders and their squads. 286 287 305
• Zodiac service — Later joins the Zodiacs and works under Mizai Istom coordinating field operations. 387

Trivia

• Kastro's white clothing is prominent enough for Heaven's Arena to market him under the title “White Robe.” 208
• His original, poorly suited path involved developing Double, a Conjuration- and Manipulation-type ability that conflicted with his Enhancement talent; Leo redirected him before he committed to it. 99 100
• He drinks juice rather than alcohol during the New Year's Eve gathering at Colton Manor. 252