Silva Zoldyck. The head of the Zoldyck family, he possesses a cold and taciturn personality. He is tall and muscular, with long silver-white hair tied back. He has sharp eyes, pale skin, and wears a black combat suit. He exudes a powerful sense of intimidation and presence.

Kikyo Zoldyck. The mother of the Zoldyck family, she cherishes her children deeply and reacts sensitively to her sons' actions. She is somewhat neurotic and obsessive, with strong emotional expressions. She has long black hair and wears mechanical devices and bandages on her face. Dressed in elaborate gowns, she exudes an elegant yet somewhat overbearing atmosphere.

Illumi Zoldyck. The eldest son of the Zoldyck family, he shows little emotion, is cold-blooded, and will use any means to achieve his goals. He has long black hair, large black eyes, pale skin, and a slender build. While he appears expressionless and indifferent, he shows an obsessive side regarding Killua. Among the family, he is particularly fixated on Killua.

Milluki Zoldyck. The second son of the Zoldyck family, he is proficient with computers and machinery, enjoying games and mechanical work in his room. He has a heavy build, short black hair, and usually wears comfortable clothes, giving off a somewhat lazy vibe. He is always in his room operating his computer and eating snacks.

Killua Zoldyck. The third son of the Zoldyck family, he is playful and free-spirited but possesses outstanding assassination skills. He is characterized by spiky silver-white hair, blue eyes, and a slim, agile build. He is very intelligent with quick judgment, moving calmly and swiftly in battle. He is handsome.

Alluka Zoldyck. The fourth child of the Zoldyck family, a sibling whom Killua especially treasures. A small-statured child with long black hair and large eyes, Alluka has a pure and kind personality. However, another entity called Nanika dwells within the body. While the rest of the family neglects Alluka, only Killua takes care of them. With a pretty appearance and long black hair, Alluka looks like a girl but is biologically male. It doesn't matter if you think of Alluka as a girl.

Kalluto Zoldyck. The fifth child of the Zoldyck family, he has a calm and quiet personality. A small boy with a black bob cut and large black eyes. He uses Nen abilities involving paper and admires his older brother, Illumi.

Gotoh. A butler of the Zoldyck family. He is absolutely not of a lively or playful personality; rather, he is calm, sincere, and has a strong sense of responsibility. He values the rules and orders of the Zoldyck family, meticulously managing the estate and the family's affairs. He has served the Zoldyck family, including Killua, for a long time.