TV-Series
Description
Milluki Zoldyck is the second son of Silva and Kikyo Zoldyck, making him the second eldest sibling in the renowned Zoldyck family of assassins. He was born in the Republic of Padokea and resides within the family estate on Kukuroo Mountain. Unlike the lean and athletic build typical of his relatives, Milluki is notably obese as a result of a sedentary lifestyle, poor eating habits, and a preference for staying indoors. He has short, dark hair and narrow eyes, and he almost never leaves the mansion; the last time he stepped outside before a major event was around the age of ten.

Milluki is a deeply introverted and eccentric individual who embodies the archetype of a reclusive otaku. He spends nearly all his time in his personal room, which is filled with high-end computer equipment, gaming consoles, and an extensive collection of anime figurines, particularly female characters. His obsessive hobbies and materialistic desires often drive his actions. He is intelligent, technically gifted, and rational, yet he also displays arrogance, pettiness, and a tendency to bully others, especially his younger brother Killua. His grandfather Zeno once remarked that Milluki is clever but also foolish, indicating a contradiction between his technical brilliance and poor practical judgment.

As a professional assassin, Milluki fulfills his contracts remotely. He rarely engages in direct combat, instead relying on his technological expertise to carry out kills from the safety of his room. He is an elite hacker who has attempted to breach the Hunter Association's private website, and he built his own high-performance computers to assist in his work. He also invents weapons, such as miniature bombs small enough to be attached to insects, which he uses to eliminate targets discreetly. The official Hunter's Guide classifies Milluki as a Manipulator-type Nen user, but he has never been shown using Nen in the story, leaving the specifics of his abilities largely unknown.

Milluki's primary motivation is self-interest, often fueled by his consumerist obsessions. He is willing to borrow large sums of money from his father to acquire rare and expensive items, such as the game Greed Island, which he tried to purchase at auction in Yorknew City. His role within the Zoldyck family is that of a technical support specialist and information analyst. He manages the family's digital security, processes data, and provides remote assistance for missions, acting as the family's resident hacker and inventor rather than a front-line operative.

Milluki's relationship with Killua is the most prominently depicted in the story. He envies Killua's natural talent and the high expectations the family places on him, leading to open contempt and jealousy. Killua, in turn, openly mocks Milluki by calling him "Piggy" or "Fatty." Despite this mutual disrespect, there is an undercurrent of reluctant reliance between them. Milluki acknowledges that Killua is the most gifted assassin in Zoldyck history, and Killua occasionally seeks Milluki's technical help, such as when he needed information about Greed Island. Their dynamic is defined by rivalry, insults, and a grudging recognition of each other's abilities. Milluki is also respectful toward his mother Kikyo and obedient to his father Silva, and he has expressed a desire for his older brother Illumi to be present to handle difficult situations.

Milluki's character remains largely static throughout the series, with little personal growth or change. He continues to serve the family from his room, focused on his hobbies and remote assassination work. His potential for future development remains open, particularly in story arcs involving family conflicts or technological challenges, but as of the current narrative, he remains a secondary figure whose contributions are technical rather than dramatic.

In terms of physical ability, Milluki is the weakest of the five Zoldyck brothers in direct combat. He was injured by Killua during the latter's escape from the mansion. However, he still received the family's rigorous training in childhood, meaning his baseline physical condition is above that of an average person, even if it is lackluster compared to his siblings. His true strength lies in his intelligence, his hacking prowess, and his inventive capacity, all of which make him a valuable asset to the Zoldyck family despite his lack of frontline combat involvement.