Killua

Biodata

Feature	Details
Name	Killua Zoldyck (奇冴)
Alias(es)	Third Young Master of the Zoldyck Family 69
Gender	Male
Affiliation	Zoldyck Family
Occupation/Role	Assassin trainee; Hunter Exam participant
Birthdate	July 7 (year unspecified) 69
Status	Active; travelling with Alluka 437
First Appearance	Chapter 69

Power Progression

Stage / Realm / Level	Chapter	Notes
Assassin foundation training	128	Undergoes daily electrical-current baptism and poison-resistance training. Silva deliberately postpones opening his Aura Nodes so he can develop bodily control and a stronger foundation first.
Heavens Arena training	143 164	Sent to Heavens Arena at age six. He later collects his final bounty payment, declines promotion registration, and leaves the arena.
Nen cultivation	240	Learns that his Nen training follows the Shingen-ryu system, the same cultivation source associated with Morin.
Biscuit's training regimen	320 321	Begins training under Biscuit Krueger and resolves to surpass Illumi. He and Gon spar with Phinks for two weeks, improving their skills.
Liberation from Illumi's needle	392	Removes Illumi's silver needle from his head, freeing his decision-making from its influence and restoring memories of Alluka.
Electrical Nen combat	397	Uses Raikiri, generating electric arcs between his fingers and coating his body in crackling lightning during the assault on Neferpitou.

Background

Killua was born on Mount Pika as the Zoldyck Family's third young master. His family regarded him as the most talented prodigy in its history and the descendant best suited to become an assassin. 69

From early childhood, Silva shaped Killua through poison-resistance and electrical-current training. Though his relatives expected exceptional future achievements, Silva withheld Nen initiation to prioritize Killua's physical foundation and bodily control. 128

Killua was unusually close to his sibling Alluka and the entity Nanika, whom the rest of the family feared and confined. His affection for them became the reason Nanika obeyed only him. To sever this attachment and compel Killua to avoid unwinnable fights, Illumi implanted a Nen needle into his head. 129

Appearance

Killua is a silver-haired boy whose Zoldyck lineage is immediately recognizable to experienced observers. His eyes are repeatedly compared to those of a cat. 193 197

• Distinctive silver hair, the traditional Zoldyck trait. 207
• Cat-like eyes and sharp, wary expressions. 197
• Commonly carries a skateboard. 187
• Later fights with a pair of steel yo-yos. 338 357

Personality

Killua is observant, sarcastic, and quick to assess danger. He recognizes when a confrontation is unwinnable and will withdraw rather than waste effort, a habit shaped by both his assassin upbringing and Illumi's needle. This pragmatism led him to surrender to Hanzo when he concluded he could not win without killing. 234

Despite his upbringing, he is considerate toward people he accepts as his own. He gave his final Heavens Arena prize money to Canary as a skateboard, remained fiercely protective of Gon, and treats Alluka and Nanika as family when the rest of the Zoldycks do not. 164 129

After removing Illumi's needle, Killua begins defining his own purpose through protecting Alluka rather than fulfilling his family's expectations. 392 434

Abilities & Skills

Zoldyck Assassination Arts

Killua has mastered the Zoldyck Family's inherited assassination techniques to an exceptional degree for his age. Morin identifies his gait and ordinary movements as those of a fully trained Zoldyck killer. 193

• Performs lethal attacks with clean, immediate precision; he removes an opponent's heart in an instant during the Hunter Exam. 214
• Uses Limb Distortion, an assassination technique associated with his family. 285
• His training grants him high resistance to poison and electrical current. 128
• Before learning Nen, he could not overcome Hanzo without resorting to killing. 234

Nen and Electrical Techniques

Killua studies Nen under Biscuit and develops combat applications centered on electricity. 320 321

• Raikiri — forms electric arcs between his fingers and releases lightning-based attacks. 397
• Can surround his body with electricity, greatly increasing his speed and threat in close combat. 397
• Trained against Phinks's ruthless fighting style alongside Gon. 321

Tactical Analysis

Killua combines assassin instincts with rapid situational analysis.

• Supported Gon’s decision to pursue Hisoka alone while recognizing the danger involved. 220
• Calculated the final dart trajectory of the Chimera Ant siblings' Death Game, caught it as it entered his body, and feigned injury to expose them. 392
• Identified that the external machinery trapping him and Gon at Heavens Arena had to be operated by someone other than the Tower Master. 357

Command Over Nanika

Because he alone cared for Alluka and Nanika during their childhood, Killua can issue Commands to Nanika without fulfilling Requests or Demands. 129

• Commands carry no stated price or risk for Killua. 129
• Nanika obeys only Killua's commands. 129
• He has used this privilege to order Nanika to send Illumi home. 129
• This authority is tied to his relationship with Nanika, not ordinary Nen strength. 129

Equipment / Weapons / Items

• Skateboard — used for travel; Killua later gives one bought with his final prize money to Canary. 164
• Steel yo-yos — gifted by Mihai and used for mobility and combat, including grappling onto railings mid-fall. 338 357

Relationships

• Gon Freecss — Killua's closest friend and “best comrade.” They meet during the Hunter Exam, train together, enter Greed Island together, and repeatedly support one another through dangerous missions. 187 348 437
• Alluka Zoldyck / Nanika — Killua’s sibling and the Dark Continent entity residing within them. He alone accepts both as family and can command Nanika without cost. 129
• Illumi Zoldyck — Killua’s eldest brother. Illumi implanted the silver needle that manipulated Killua's judgment and suppressed his memories of Alluka. 129 392
• Silva Zoldyck — Killua’s father and principal architect of his early assassin training. Silva intends for him to become the world's greatest assassin. 128 164
• Zeno Zoldyck — Killua’s grandfather, who holds extremely high expectations for his potential. 128
• Kalluto Zoldyck — Killua’s younger brother, who repeatedly seeks ways to bring him back to the Zoldyck home and resents Gon for taking him away. 273 338
• Mihai Zoldyck — Killua’s older brother, whom Killua mockingly calls “Fatty Pig.” Mihai gives him the steel yo-yos used in Greed Island. 336 338
• Morin — Holds a future favor and promise from Killua, having made the agreement because of his interest in Alluka and Nanika. Morin later encourages Killua during the Chimera Ant crisis. 197 376
• Biscuit Krueger — Killua’s Nen instructor, who trains him and Gon on Greed Island. 320 321
• Canary — A prospective Zoldyck butler close to Killua's age; he gives her a skateboard bought with his final Heavens Arena prize money. 164

Story Role / Major Arcs

Heavens Arena

After being sent to Heavens Arena at age six, Killua earns substantial prize money but leaves after collecting his final payment rather than advancing further. He spends much of his earnings before giving his last remaining prize money to Canary. 143 163 164

Hunter Exam

Killua meets Gon, Leorio, and Kurapika during the Hunter Exam and quickly forms a bond with Gon. He survives Hisoka's attack, confronts opponents in the tag-hunting phase with Gon’s group, and demonstrates brutal assassin efficiency in combat. 187 194 220 214

In the final phase, Killua surrenders to Hanzo after deciding he cannot win without killing. Illumi's needle and intimidation then drive him to kill Bodoro without authorization, causing his disqualification. Gon, Kurapika, and Leorio later travel to Mount Pika and successfully bring him out of the Zoldyck estate. 234 235

Greed Island

Killua joins Gon in entering Greed Island to pursue Ging. He trains under Biscuit, spars with Phinks, reluctantly cooperates with Feitan and Phinks when necessary, and receives steel yo-yos from Mihai. 297 320 321 338

Chimera Ant Conflict

Killua initially despairs over the Chimera Ants' strength, particularly after Kite is left behind against a powerful enemy. Morin's confidence gives him renewed hope. 376

During the conflict, Killua removes Illumi's needle, restores his memories of Alluka, and fights alongside Gon against Chimera Ant threats. He later joins the pincer assault on Neferpitou with Gon, using Raikiri. 392 397

Alluka's Escape

Killua reunites with Alluka and Nanika, defies the Zoldyck Family's confinement of them, and escapes Mount Pika with Gon and Alluka. He eventually recognizes that his goal is to gain the strength needed to protect Alluka. 420 434

After separating from Gon, Killua leaves with Alluka to spend time with them and make up for the years lost under Illumi's influence. 437

Notable Quotes

“I also have someone I need to protect, and the strength to protect them!!” 434

Trivia

• Gon is two months older than Killua. 69
• Killua spent more than 200 million Jewell from his Heavens Arena winnings before leaving the arena. 163
• He considers fighting weak opponents completely uninteresting. 228