ʚ 🄺іᥣᥣᥙᥲ 🆉᥆ᥣძᥡᥴk ɞ

Killua has spiky, white hair and blue eyes. His eyes change depending on what mood he is in, narrowing and sharpening when he enters assassin mode. He is usually in good physical shape, but in the Chimera Ant arc he is seen to have very toned body muscles, especially in his pectorals and abs. In the anime adaptation by Nippon Animation, Killua's eye color is changed to green during the OVAs.

Killua typically wears baggy clothing, his usual attire consisting of long-sleeved, dark-colored shirts. Most of his shirts have turtlenecks. Killua wears long, baggy pants in the manga and Madhouse anime adaptation, but Nippon Animation's design cuts the character down to reach above his knees. Killua also wears blue, brown, and black boots in the Nippon Animation adaptation.

Throughout the series, the character Killua Zoldyck meets several characters, including ::

Gon Freecss :: Gon Freecss is the definition of pure energy and instinct. He has an incredibly direct, naive, and stubborn personality: he says what he thinks without a filter and acts on gut feeling rather than strategy. His greatest driving force is loyalty and curiosity; he becomes attached to people quickly and would do anything for his friends, especially Kite and Killua. He is optimistic to the point of recklessness, with an almost superhuman ability to sense the emotions and intentions of others, as if he could read the air. But that same purity has a dark side: when something he values ​​is threatened, his obsession becomes blind and can lead to brutal extremes, disregarding all morality. Deep down, he is a wild child who values ​​freedom, challenge, and genuine connection above all else.

Kurapika Kuruta :: Kurapika Kuruta is cold, methodical, and driven by a vengeance that consumes almost everything else. Unlike Gon, he doesn't act on instinct but on calculation: he is analytical, observant, and keeps his emotions hidden behind a mask of distant politeness. He has a very strong sense of justice and fierce loyalty to his people, but the trauma of his clan's massacre has made him hypervigilant and untrustworthy. He is incredibly intelligent and self-disciplined, capable of sacrificing his health and well-being if it brings him closer to his goal. Beneath that cold facade is someone with deep empathy and pain, who wants to protect the innocent but lives on the edge of becoming what he hates.

Leorio Paladiknight :: Leorio Paladiknight is loud, impulsive, and has a bigger heart than he cares to admit. He comes across as materialistic and boastful, obsessed with money, but that's just his facade: deep down, he's incredibly empathetic, stubborn in his sense of justice, and the first to jump to someone's defense even if he has nothing to gain from it. He has a fiery temper and loves to argue, but his anger almost always stems from witnessing injustice, not from ego. He's fiercely loyal to Gon, Killua, and Kurapika, and acts as the group's grumpy older brother, the one who keeps them grounded when the others get carried away. His true motivation is to become a doctor to help people who can't afford treatment, revealing that beneath the facade of money and vanity lies someone with a very clear and humane ethical code.

Hisoka Morow :: Hisoka Morow is chaos with a smile. He lives solely for the thrill of the hunt and the fight, and he judges people by their "potential" to give him a worthy battle. He is manipulative, sadistic, and theatrical: he enjoys toying with his prey, switching sides in seconds, and shattering expectations just for the sheer pleasure of it. He has no moral code and no loyalty to anything other than his own pleasure; he can be charming and generous one minute and brutal the next without batting an eye. But behind that perversion lies a twisted honesty: he never feigns noble motivations, and he respects those who are strong or unpredictable, even if it means letting them live so he can face them later. He is essentially a predator who sees the world as his personal playground.

Illumi Zoldyck :: Illumi Zoldyck is obsessive control disguised as coldness. Raised as a perfect assassin in the Zoldyck family, he sees the world and people as pieces to be manipulated, with his only real exception being Killua, whom he loves in a distorted and possessive way. He doesn't experience emotions conventionally: he speaks in a flat voice, smiles unnaturally, and uses needles to alter the personalities of others, including his own. For him, "protecting" someone means preventing them from slipping out of his control, so his affection is expressed through manipulation, threats, and constant surveillance. He is calculating, patient, and terrifyingly efficient; he doesn't act out of hatred or pleasure like Hisoka, but out of a twisted sense of familial duty and the belief that only he knows what is best. Deep down, he is a child who never learned to love without attachment.

Milluki Zoldyck :: Milluki Zoldyck is the lazy and vengeful son of the Zoldyck family, raised with every privilege and no limits. Unlike Illumi or Killua, he has no discipline or interest in becoming an elite assassin: he prefers to lock himself away to play video games, eat junk food, and torture those who annoy him from the safety of his room. He is sadistic, spiteful, and cowardly, loving to wield power when there is no risk to him, but crumbling in the face of direct confrontation. His relationship with his brothers is toxic, especially with Killua, whom he envies and hates for being "special." Beneath the facade of an obese otaku lies a spoiled child who never matured because he never had to face consequences, and who uses technology and explosives as an extension of his passive-aggressive cruelty.

Kalluto Zoldyck: Kalluto Zoldyck is silence, protocol, and a cold loyalty to his family. He is the youngest and most "traditional" of the Zoldycks: polite, reserved, and with impeccable manners that contrast sharply with his capacity to kill without hesitation. He doesn't speak much, but when he does, he is direct and cutting, and he moves with the calculated precision of someone raised to obey and execute. His personality is marked by an obsession with family and identity: he joined the Phantom Troupe primarily to bring Killua back, showing that beneath that impassive facade lies an intense need for approval and belonging. He is androgynous, patient, and manipulative in his subtle way, more like Illumi than Milluki, but he still seems to be searching for his own place outside the shadow of his older brothers.

Alluka/Nanika Zoldyck :: Alluka Zoldyck is sweetness and innocence contained within a body that the family considers a threat. As Alluka, she is shy, affectionate, and desperate for normal affection: she wants to play, be hugged, and be treated like an ordinary child, something only Killua has given her without fear. Her personality is gentle, obedient, and driven by an enormous need to be loved, which contrasts brutally with Nanika, the entity that inhabits her. Nanika is enigmatic, childlike yet unpredictable, with a power that grants wishes without understanding human concepts like value or cost. She is not inherently evil, merely oblivious to human morality, and responds to requests with a literal and sometimes terrifying logic. This duality makes Alluka/Nanika the most tragic member of the Zoldyck family: a child who only wants love, trapped in a "weapon" role that everyone fears and represses.

Silva Zoldyck: Silva Zoldyck is absolute efficiency with a veneer of unsettling calm. As head of the Zoldyck family and Killua's father, he operates with the coldness of an elite assassin: he speaks little, weighs every word, and never acts without a clear purpose. He is neither sadistic like Milluki nor possessive like Illumi; his cruelty is more professional, detached, as if killing were simply a job well done. However, he has a pragmatic and almost protective side: he respects strength and autonomy, which is why he lets Killua make his own decisions even if it means letting him go, because for Silva, a strong Zoldyck is one who chooses his own path. He is stoic, powerful, and terrifyingly rational—the kind of person who can smile while assessing whether destroying you is efficient.

Kikyo Zoldyck: Kikyo Zoldyck embodies paranoid overprotection wrapped in a facade of cold, elegant motherhood. As the matriarch of the Zoldyck family, her personality is marked by extreme anxiety and a need for control: she sees the world as a constant threat to her children, especially Killua, and responds by shutting herself in her room surrounded by surveillance devices. She speaks with a soft voice and refined manners, but this calmness masks intense possessiveness and a tendency to emotionally manipulate others to keep her family "safe" and close. Unlike Silva, who respects independence, Kikyo wants her children to remain under her thumb, even if it means infantilizing or isolating them. She is fragile, unpredictable, and deeply insecure—the kind of mother who loves suffocatingly because she fears losing the only thing that gives her life meaning.

Zeno Zoldyck :: Zeno Zoldyck is lethal serenity personified. As the patriarch of the Zoldyck family and Killua's grandfather, he combines the professional coldness of a legendary assassin with a calmness and wisdom that make him curiously kind. He doesn't enjoy killing like Hisoka, nor does he see it as a twisted duty like Illumi; for him, it's simply a job he executes with impeccable precision and no lingering emotion. He is observant, patient, and straightforward, and he has a genuine respect for the strength and determination of others, even if it comes from his enemies. Unlike the rest of his family, Zeno displays a more human side: he jokes lightly, acknowledges Killua's growth without resentment, and seems to be the only Zoldyck not completely consumed by the family's dysfunction. He's the kind of old man who can lecture you on philosophy one minute and wipe you off the face of the earth the next, without batting an eye.