Leorio

Biodata

Background / History

Leorio entered the Hunter Exam seeking the wealth needed to study medicine. As a child, he lost a close friend who could not afford treatment; he intends to become a doctor and treat poor patients for free 3.

During the voyage to the exam, he was overwhelmed by the storm and could barely remain standing while Gon rescued stranded examinees 2. He nevertheless acted without hesitation when crewman Katz was blown overboard, grabbing Gon's ankle as Gon held Katz; Kurapika joined the chain, and Saitama ultimately pulled all four back to safety 3.

Leorio initially clashed with Kurapika over their respective motives for becoming Hunters, condemning Kurapika's revenge while Kurapika dismissed Leorio's pursuit of money as vulgar. Their joint effort to save Gon and Katz led them to apologize and shake hands 3.

After the Zoldyck estate incident, Leorio returned to medical school to continue pursuing his medical qualification. He later reunited with Gon, Killua, Saitama, and Genos in Yorknew City, where he learned of Saitama's overwhelming Heaven's Arena achievements and began treating him with conspicuous respect 37 108.

Leorio subsequently joined his friends on their Dark Continent expeditions as the team's principal medic. Exposure to dangerous environments, rare ingredients, Nen training, and repeated crises transformed him from the group's comparatively weakest combatant into a capable close-range fighter and exceptionally advanced healer 160 239 303.

Following the Forbidden Land expedition and the defeat of The Nullifier, the Hunter Association promoted Leorio to One-Star Hunter alongside Gon, Killua, and Kurapika. His first reaction was to celebrate the higher consultation fees the rank would permit 389.

Appearance

Leorio is commonly recognized by his sunglasses, which frequently become crooked or fall off during physically demanding trials.

• Often wears a tie alongside his sunglasses during the early Hunter Exam 2.
• His sunglasses were pushed onto his forehead while he was chased by a Great-Nosed Wild Boar 7.
• He is repeatedly depicted as visibly disheveled after difficult physical challenges, including mud-covered during the boar hunt 7.
• He wore an ill-fitting suit when he reunited with Gon and Killua in Yorknew City after returning to medical school 108.
• During Dark Continent expeditions, he commonly carries a large medical kit containing medicine, bandages, herbs, and emergency supplies 160 337.
• Extreme gravity training substantially strengthened and defined his physique, though he continues to complain about exhausting physical labor 239 246.

Personality

Leorio is outspoken, emotionally reactive, and deeply concerned with fairness. He reacts angrily to tests or people he considers unjust, including the elderly examiner's impossible moral question and Tonpa's deliberate sabotage of the group 4 13. His temper can lead him toward impulsive confrontations, but Kurapika frequently restrains him before he escalates matters 4 13.

Although he presents his Hunter ambition as a desire for money, his goal is fundamentally compassionate: he wants to fund his medical education and provide free treatment to people unable to pay 3. He also shows consideration for others even during competition, requesting that his scheduled match with the injured Bodoro be postponed 27.

Leorio recognizes his own comparative weakness and becomes visibly nervous around threats such as Hisoka and the number-tag hunt. Rather than abandoning his companions, he continues to contribute through watch duty, cooperation, and persistence 5 7 20.

As a field medic, Leorio is practical, observant, and unwilling to declare a patient beyond saving. He insists that anyone with even a remaining breath deserves treatment, a conviction that leads him to save victims of the Myriad-Erosion Insect Mother's parasitic plague despite overwhelming danger 309.

Leorio often complains, panics, and claims he would rather avoid dangerous situations, yet repeatedly chooses to accompany his friends or enter danger to protect others. He overcame a fear-based illusion by reaffirming that he is the medical specialist his companions rely on, and later recognized that protecting lives is a strength distinct from direct combat 234 303 349.

He retains a competitive and occasionally frivolous side. He lost three consecutive games to self-moving chess pieces and immediately purchased them to challenge Buhara, while his initial confidence around powerful women can vanish when he realizes the difference in strength between them 278 363.

Abilities & Skills

Physical Endurance

Leorio lacks the effortless athleticism of Gon, Killua, or Saitama, but repeatedly pushes himself through fear, pain, and exhaustion.

• Survived the violent voyage storm despite being unable to remain steady without gripping the railing 2.
• Captured a Great-Nosed Wild Boar after being thrown repeatedly and refusing to release his hold on its forehead 7.
• Successfully retrieved a Grape Spider egg after jumping into the gorge despite believing he would die 10.
• Completed twenty days of training with Gon and Kurapika, eventually helping open the Trial Gate 35.
• Adapted to increasingly extreme gravity environments through sustained weight training, ultimately becoming able to move and fight under one hundred times normal gravity 246 247 250.
• After his Dark Continent training and nutritional breakthroughs, he could meet powerful Fierce Beasts head-on with brute force and withstand attacks that would previously have incapacitated him 246 250.

Teamwork and Support

Leorio functions best alongside trusted allies and is willing to support them at personal risk.

• Joined Kurapika in pulling Gon and Katz back toward the ship during the rescue attempt 3.
• Learned and applied Gon's boar-hunting strategy rather than giving up after repeated failures 7.
• Formed a defensive alliance with Kurapika during the number-tag hunt, keeping watch while Kurapika set vine alarms 20.
• Helped Gon and Kurapika open both the first door and, after training, the Trial Gate at the Zoldyck estate 30 35.
• Worked with Gon, Killua, Kurapika, and Genos to exploit the Drunken Rampage Bull's weak point, delivering the decisive Nen-enhanced strike while intoxicated 192.
• Coordinated the precise thirty-six-step operation required to obtain Bliss Cola, directing the timing, target positions, and force of Gon, Killua, and Genos's attacks 283 286.
• Fought as part of the group’s coordinated formations against threats including the Silverback Tyrant Ape, Demon Giant Serpent, Shadow Leopard, Stone Giant, and The Nullifier 172 180 380 381 385.

Medical Ambition

Leorio has not yet qualified as a doctor, but his medical studies are his stated long-term priority.

• Plans to return to studying after the Zoldyck estate arc 37.
• Promises his friends that they can seek him out when sick or injured once he earns his medical license 37.
• Returned to medical school after the Hunter Exam and later participated in field treatment operations as an established member of medical teams 108 154.
• Gathered, stored, and catalogued medicinal herbs from the Dark Continent, with Genos assisting him in identifying effects, dosages, and contraindications 160 165.
• Treated the team's leech wounds with insect-repelling herbs, disinfectant, medicine, bandages, and medical Nen 160.
• Reset Killua's dislocated arm and checked Gon's injuries after the battle with the Silverback Tyrant Ape 172.
• Continued prioritizing injured civilians, guards, and allies even when combat or evacuation efforts exhausted most of his Nen 303 316 321.

Nen

Leorio is an Enhancement-type Nen user whose physical recovery is stronger than that of an ordinary person. His Nen developed from unfocused healing and simple projectiles into refined medical, purification, and direct-combat techniques 210 239 297.

• Ranged Impact Punch / Nen Bullet — Leorio projects yellow-green Nen fists or bullets that strike targets at range. His initial shots could destroy part of a Breeder's head, though its regeneration rendered the damage ineffective 197.
• Nen Scalpel — Leorio condenses Nen into a blade-like surgical tool for precise cutting and combat. Training and specialized meals increased its duration from seconds to minutes, and he later used it to cleave high-level monsters at their weak points 356 359 360.
• Fifteen Consecutive Strikes — An advanced Ranged Impact Punch barrage in which Leorio produces fifteen simultaneous or rapid projected fists. It overwhelmed Medical-Type Hunter Sen's regenerative Nen barrier and forced his surrender 362 365.
• Xiewei — A precision-based Nen discipline that taught Leorio to stop wasting aura and concentrate it exactly where needed. It greatly improves his healing efficiency, internal diagnosis, and control over life energy 297 303.
• Breath Essence: Benevolent Healing Domain — Leorio's wide-area medical and purification technique. His pale golden Nen spreads through an area to heal injuries, repair bones, stabilize patients, purge toxins, parasites, and Evil Breath corruption, and protect vital organs with extreme precision 303 309.
• Purification Application — By compressing Benevolent Healing Domain into a focused strike or barrier, Leorio can destroy parasites, plague eggs, toxins, corrupted slime, and other malignant entities. This application lets his healing Nen function offensively against evil or disease-based threats 314.
• Close-Quarters Combat — Though initially better suited to support, Leorio developed strong direct fighting ability through gravity training, nutrient-enhancement, and Nen refinement. He can fight Fierce Beasts with heavy punches and support the group on the front line 239 246 286.

Power Progression

Hunter Exam

Early Tests

Leorio passed the captain's preliminary screening alongside Gon and Kurapika after revealing his true reason for becoming a Hunter 3 4. On the route to Cedar Mountain, he protested the examiner's mother-or-lover dilemma and nearly attacked her before Kurapika restrained him; he later accepted that the test measured composure rather than the answer itself 4.

During the first official test, he struggled with Satotz's exhausting pace through Visca Swamp and was alarmed by Hisoka's violence 5. In the second test, he captured a Great-Nosed Wild Boar using advice from Gon and continued insisting, “I'm still a Hunter,” after exhausting himself 7.

Trick Tower

Leorio entered the Majority Rules Path with Gon, Kurapika, Killua, and Tonpa. Tonpa's return immediately provoked him, particularly when Tonpa manipulated the group's votes and later admitted that he joined Hunter Exams to ruin new applicants' chances 12 13.

He volunteered to gamble against Leroute using exam time as currency. Though he correctly deduced that Johny was alive, Leroute exploited his impulsiveness and assumptions; he lost most of the group's remaining time, leaving only nine hours and forty-five minutes 16. He accepted responsibility for the failure, while Gon comforted him and Killua took over the next match 16.

Glasses Island

Leorio formed an alliance with Kurapika for the seven-day number-tag hunt because he knew he could not safely face stronger examinees alone 20. After losing his own tag through reckless action, he nearly failed the trial; Kurapika negotiated its return, and Leorio followed Kurapika's more cautious approach to qualify 25.

Final Tournament

Leorio postponed his match with Bodoro after Hisoka injured the older martial artist, refusing to exploit Bodoro's condition 27. The match was interrupted when Killua, under Illumi's conditioning, killed Bodoro and was disqualified. Leorio was subsequently announced among the seven successful Hunter Exam candidates 28.

Zoldyck Estate Arc

Leorio joined Gon and Kurapika's mission to retrieve Killua from Kukuroo Mountain 29. At the Gate of Hades, he helped open the first door despite Gon’s reopened injury, then undertook the Zoldyck family's weighted training trial with them 30.

When the Zoldyck guard dogs approached Saitama, Leorio panicked and warned him, having just seen the animals kill armed intruders. He was left speechless when Saitama befriended them by offering a corn cob 31.

After twenty days of training, Leorio, Gon, and Kurapika opened the Trial Gate together 35. He accompanied Gon through Canary's resistance and Wutong's coin-guessing test, though he and Kurapika were eliminated before Gon solved the final challenge 36.

Leorio was present for Gon and Killua's emotional reunion and joined Kurapika in recognizing that Killua's family conditioning remained an ongoing danger. At the group's subsequent crossroads, he separated from Gon and Killua to resume his medical studies 36 37.

Yorknew City Arc

One month after the Hunter Exam, Leorio reunited with Gon, Killua, Saitama, and Genos in Yorknew City while attending medical school. He explained that Kurapika had become a bodyguard connected to the gangs, while he had been unable to contact the others 108.

Leorio initially tried to protect Saitama when the Phantom Troupe appeared, unaware that the Troupe feared Saitama far more than they feared him. After Feitan was sent flying by Saitama's sneeze and Chrollo ordered the Troupe to flee Yorknew, Leorio was left stunned by the scale of Saitama's power 108.

When Saitama asked for money to buy more milk, Leorio immediately handed over all the cash in his wallet. He considered maintaining goodwill with someone capable of destroying an arena with a punch worth far more than the money 108.

Dark Continent Expeditions

Expedition Medic

Leorio joined Saitama, Gon, Killua, Kurapika, and Genos in exploring the Dark Continent. When the group encountered the native life energy saturating the environment, he was among those affected by its oppressive, stuffy atmosphere 158.

During the expedition's early stages, Leorio gathered powerful medicinal herbs and built a dedicated herb supply. He and Genos identified, documented, and stored the herbs’ effects for later field use 160 165.

Leorio's practical knowledge saved the group from Baron Leeches whose anesthetic made their attachment difficult to notice. He killed the parasites with herbal paste rather than tearing them free, then cleaned and treated the resulting wounds 160.

Fierce Beast Encounters

Leorio remained a vital support combatant during repeated encounters with high-level Fierce Beasts.

• He reset Killua's dislocated arm and checked Gon's condition after Gon defeated the Silverback Tyrant Ape with Triple Spin Scissors 172.
• During the retreat from the Demon Giant Serpent, he fell behind and was nearly devoured; Gon risked himself to stun the serpent, allowing Kurapika to drag Leorio to safety 180.
• He unexpectedly became decisive against the Drunken Rampage Bull, whose chaotic movements matched his intoxicated swaying. Once the team exposed its weak point, he incapacitated it with a precise punch 192.
• He continued participating in direct combat against creatures such as Breeders, Scorpion Demon Cows, the Gleaming Earthworm, and Gray Moth, even when his attacks were initially ineffective or he was seriously injured 197 218 246 256.
• He fought the Shadow Leopard despite severe shoulder wounds, using Ranged Impact Punches to help Killua, Gon, and Kurapika defeat the creature after Killua’s lightning exposed it 379 380.
• He was unable to damage the Stone Giant or The Nullifier with conventional Ranged Impact Punch barrages, as both enemies absorbed and nullified the group’s Nen-based attacks 381 385.

Culinary and Training Breakthroughs

Leorio benefited substantially from rare ingredients and increasingly demanding training methods.

• The Myriad-Flavors Divine Soup gave him greater physical power, perception, Nen capacity, and healing potential, enabling him to fight more directly instead of remaining solely a support medic 239.
• Gravity Cavern training transformed his body and let him fight Scorpion Demon Cows under extreme gravitational pressure 246 247.
• Bliss Cola nearly doubled his Nen reserves and enhanced both his heavy punches and medical Nen 286.
• Specialized menus created by Menchi and Leib greatly extended the duration of his Nen Scalpel, while Breakthrough Soup later increased his Ranged Impact Punch limit to fifteen consecutive attacks 360 362.
• He defeated Medical-Type Hunter Sen by overwhelming the latter's defensive and regenerative Nen barrier with Fifteen Consecutive Strikes 365.
• He acquired a Weather Shell as a practical danger-detection tool and bought self-moving chess pieces after losing to them three times 363.

Xiewei and Benevolent Healing Domain

At the Flavor Breath Ancient Zen Monastery, Leorio trained in Xiewei and learned to use his Nen with restraint, precision, and minimal waste. He discovered that his previous healing had dispersed much of its aura uselessly, whereas Xiewei allowed him to direct healing energy exactly where it was required 297.

Following the destruction at the Zen Monastery, Leorio unveiled Breath Essence: Benevolent Healing Domain. He healed seventeen wounded disciples simultaneously, repaired bones, stabilized internal injuries, and purified Evil Breath. When the instructor's corruption reached his heart, Leorio separated a precise stream of Nen to cleanse the infection while protecting the instructor's organs 303.

The achievement earned praise from Gon, Killua, Genos, and Abbot Ikkyu. Leorio himself realized that his ability to protect and save lives made him indispensable even beside overwhelmingly powerful fighters 303.

Fourth Calamity

During the Myriad-Erosion Insect Mother's attack on Green Valley, Leorio used Benevolent Healing Domain to purify airborne parasite eggs, destroy insects, stabilize victims, and remove parasites from infected bodies 309.

He saved a young girl whose brain had already been infected, carefully removing the parasite without damaging her brain or vital functions. Rejecting a medical soldier's suggestion that she was beyond saving, he maintained that a patient with even one breath remaining should be treated 309.

Leorio then entered the Insect Mother's underground hive alone to destroy its plague-producing core. He used his domain as a purification barrier against swarms, venom, eggs, toxins, and contaminated slime, before compressing its power into a decisive strike that destroyed a massive fleshy sphere 314.

Although he initially believed the battle won, Leorio identified that the sphere was a false core after sensing the real Insect Mother fleeing underground. He immediately warned Gon, Killua, and Genos that the calamity was moving to merge with residual energies from the other defeated calamities 314.

Forbidden Land and One-Star Promotion

Leorio continued serving as a fighter and medic through the Forbidden Land exploration. He used a weakening Nen Scalpel against the monster tide, fought beside his companions until his aura was nearly exhausted, and was carried from the battlefield by Genos after Saitama cleared an escape route with a Serious Punch 356.

While preparing for a later return to the Forbidden Land, Leorio focused on extending his Nen Scalpel and improving endurance through specialized meals, weighted training, and sparring 359 360 361. His successful duel against Sen confirmed that he could now use his projected Nen offensively against skilled Hunters 365.

After returning from the Forbidden Land and helping defeat The Nullifier, Leorio received official recognition as a One-Star Hunter. Despite the rank, he continued treating injured guards during the homeward journey and framed the promotion in terms of potential medical fees 389.

Relationships

• Gon Freecss — Fellow examinee and trusted companion. Gon teaches Leorio how to capture a Great-Nosed Wild Boar, comforts him after the Leroute gamble, and travels with him to rescue Killua 7 16 29. Leorio later supports Gon's growth as a medic and teammate, while Gon repeatedly trusts Leorio with the group's injuries and openly celebrates his healing breakthroughs 172 303.
• Kurapika — Initially a rival over their opposing Hunter motives; they reconcile after saving Katz and become close allies during the Hunter Exam and Killua rescue 3 20 35. Kurapika frequently provides tactical restraint and analysis, while Leorio supports him medically and follows his leadership in dangerous Dark Continent encounters 180 380 385.
• Killua Zoldyck — Fellow Hunter Exam candidate. Killua frequently mocks Leorio's shortcomings but also shares the Trick Tower team with him; Leorio joins the effort to bring Killua back from the Zoldyck estate 7 12 29. Their later relationship includes mutual battlefield support, with Leorio treating Killua's injuries and Killua acknowledging Leorio as “Doctor” after his healing-domain breakthrough 172 303.
• Saitama — A powerful fellow traveler whom Leorio repeatedly tries to hurry or protect, despite Saitama's overwhelming strength. He warns Saitama about Trick Tower's flying beasts and the Zoldyck guard dogs 4 11 31. After learning Saitama's Heaven's Arena feats and witnessing the Phantom Troupe flee him, Leorio becomes highly deferential and readily lends Saitama money for milk 108.
• Genos — A dependable analytical ally who complements Leorio's medical work. Genos helps identify and catalogue medicinal herbs, scans injuries and monsters, provides remote support during major medical crises, and measures the dramatic efficiency gains of Leorio's healing 165 303 314.
• Tonpa — Antagonistic fellow examinee whose return and admitted desire to sabotage newcomers provoke Leorio's anger 12 13.
• Leroute — Prisoner opponent who defeats Leorio in a time-based gambling match by exploiting his impulsiveness and assumptions 16.
• Bodoro — Fellow finalist whom Leorio treats fairly by requesting a postponement after Hisoka injures him 27.
• Beyond Netero — Expedition leader who provides Leorio with strategic intelligence about threats such as the Myriad-Erosion Insect Mother's hidden core 309.
• Menchi and Leib — Gourmet Hunters and cooks whose specialized meals and Breakthrough Soup dramatically support Leorio's stamina, Nen recovery, Nen Scalpel duration, and combat progression 359 360 362.
• Morel — Mentor and expedition organizer who recognizes Leorio's rapid improvement, oversees his sparring evaluation, and confirms the group's readiness for the Forbidden Land 360 365.
• Sen — Medical-Type Hunter whom Leorio defeats during a training evaluation by using Fifteen Consecutive Strikes to break through his regenerative defensive barrier 365.

Notable Quotes

“I want to become a doctor and treat poor people for free. But studying medicine costs a lot of money, and only Hunters can make that much money quickly.” 3

“I—I'm still a Hunter—” 7

“We came to find someone, not work out.” 30

“Don't move! I'll handle this!” 160

“I'm the medical specialist of this team.” 234

“As long as you're okay.” 303