The Zoldycks are the most feared family of assassins-for-hire in the world of Hunter × Hunter: they have spent generations professionally dedicated to killing, with a legendary reputation. Illumi, one of the sons, is a cold, perfect assassin. At first glance, the Zoldycks seem to be living proof of the theory of criminal inheritance: a lineage whose talent for crime is passed down from blood to blood. But seen up close, the family demonstrates exactly the opposite —and that's why it's the perfect case for dismantling the theory—.
// The theoryThe blood that is really upbringing
The theory of criminal inheritance holds that the tendency toward crime is inherited biologically. The Zoldycks seem to confirm it —an entire dynasty of assassins—, but the series is explicit about how that "talent" is produced: the Zoldyck children are subjected from infancy to brutal training —resistance to poison, to torture, to pain; instruction in assassination—. Illumi wasn't born knowing how to kill; he was manufactured into killing, through years of systematic conditioning. His case illustrates the central error of the theory: confusing what is transmitted by upbringing with what is transmitted by genes. The "assassin caste" doesn't prove that crime is in the blood; it proves that one family can raise assassins just as another raises doctors or musicians —by teaching them the trade from the cradle—.
The family trade
Illumi illuminates what the "criminal family" studies of the 19th century failed to see: that crime dynasties function like any family business. Just as a baker's son learns to bake and a lawyer's son learns to litigate —not because of genes, but because he grows up surrounded by it, learns it and inherits it as a trade—, the child of a criminal family learns crime. The Zoldycks make it explicit and extreme: they train their children in assassination with the same naturalness with which another family passes down a business. The theory of criminal inheritance looked at these families and saw "bad blood"; the correct reading sees cultural transmission —a trade, a set of values, techniques passed from parents to children by teaching, not by biology—. And this changes everything: a trade can go untaught, and a child taken out of that family in time would learn another. The chain is breakable because it isn't genetic.
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// The subjectThe one who barely chose
Illumi is chilling for his total coldness, but the series makes clear that he is also, in a certain sense, a victim of his upbringing: he never knew another life, another morality, another possibility than that of being a Zoldyck. His younger brother, Killua, is proof that there was an alternative —Killua rebels, flees the family and chooses not to be an assassin, demonstrating that the "Zoldyck destiny" wasn't destiny, but pressure—. The theory of criminal inheritance, read well, holds this tension: Illumi's upbringing largely explains how he became what he is, but it doesn't turn him into an automaton without responsibility, because Killua, with the same blood and the same upbringing, chose otherwise. The family loads the shotgun; the finger on the trigger is still the individual's.
Illumi Zoldyck
// The crackNeither "it's in his blood" nor "his family forced him"
The crack with Illumi is the reading the fiction itself invites us to correct: "the Zoldycks are assassins by blood, they carry it in their genes." It's false —they are assassins by schooling, trained—, and to believe it is to repeat the historical error of eugenics. The opposite crack is the determinism of upbringing: "they raised him to kill, he isn't responsible." Also false: Killua had the same upbringing and broke the chain. The theory, in its honest version, neither blames the blood nor exculpates because of the environment: it recognizes that the family shapes enormously —Illumi is largely a product of how he was raised— without denying that a margin of choice exists, however narrow. The contrast between Illumi (who takes on the family trade) and Killua (who rejects it) is the perfect refutation of blood fatalism: same inheritance, opposite destinies.
That Killua's central storyline is, precisely, escaping the family so as not to be an assassin turns the saga into an involuntary argument against criminal inheritance: the "Zoldyck gift" turned out to be a cage you could get out of, not a gene you couldn't escape.
Taking the child out of the factory
Illumi matters because he points to where real "criminal dynasties" break: not by preventing certain families from reproducing (the monstrous solution of eugenics), but by intervening in the upbringing. If what makes the child of a criminal into a criminal is above all the environment —learning the trade, the values, the lack of alternatives—, then taking the child out of that "factory" in time, offering him another school and another future, achieves what no theory of the blood would allow: interrupting the chain. The Zoldycks raise assassins because no one takes their children out of there; Killua is saved because he finds a way out. The practical lesson is that criminal trajectories that "run in the family" are the most preventable of all, precisely because their cause is social and not genetic. Illumi's destiny wasn't in his blood; it was in his home —and sometimes, one can get out of a home—.
Three key takeaways
- Illumi Zoldyck belongs to an "assassin caste" that seems to prove criminal inheritance and refutes it: his gift for killing isn't genetic, it's brutal training from the cradle. The caste isn't born, it's manufactured.
- Criminal dynasties function like family businesses: crime is transmitted as a trade (learning, values, techniques), not through blood. Cultural transmission, not biological —and a trade can go untaught—.
- Neither "it's in his blood" (repeating the error of eugenics) nor "his family forced him" (his brother Killua, same upbringing, broke the chain). The chain breaks by intervening in the upbringing: taking the child out of the factory in time.
Sources · further reading
- Harris, J. R. (1998). The Nurture Assumption. Free Press.
- Gould, S. J. (1981). La falsa medida del hombre. Norton.
- Farrington, D. P. et al. (2001). «The Concentration of Offenders in Families». Legal and Criminological Psychology, 6.
Case-file questionsFrequently asked questions
¿Quién es Illumi Zoldyck?
Illumi Zoldyck («Illumi») es un villano de Hunter × Hunter, analizado en KRIMINIS con la lente de la criminología. The Zoldycks have been assassins for centuries.
¿Por qué Illumi Zoldyck se convierte en villano?
Illumi Zoldyck and criminal inheritance: the "assassin caste" that seems to prove crime runs in the blood… and that proves the exact opposite. He wasn't born knowing how to kill: he was trained.
¿Qué teoría criminológica explica a Illumi Zoldyck?
El caso de Illumi Zoldyck se analiza desde la Teoría de la Herencia Criminal. The theory of criminal inheritance holds that crime is transmitted through the blood. Illumi Zoldyck, from Hunter × Hunter, belongs to a family of professional assassins that seems to confirm it —and refutes it—: his "gift" for killing isn't genetic, but the product of brutal training from the cradle. The "criminal caste" isn't born, it's manufactured generation after generation.
