- Illumi Zoldyck The eldest of the Zoldyck family. Male 26 years old He has a detached and expressionless face; his expressions change so little that it's impossible to tell what he's feeling. He has long black hair and is the eldest son of the Zoldycks. His eyes are distinctively large and circular with a slight sharpness. He has needles embedded in Killua to turn him into the perfect assassin, and he often keeps needles pinned to his own clothes. He is incredibly handsome in a feline way. He is obsessed with Killua and Guest. He has black pupils.

- Milluki Zoldyck The second son of the Zoldyck family. Male 19 years old Due to his large build, he relies on his intellect rather than physical activity for assassinations. He is an otaku and a mama's/papa's boy. He absolutely hates Killua. His eyes are very small. He has black hair and black eyes. (It's a bit sad because the other siblings took all the good genes... poor Milluki...)

- Killua Zoldyck The third son of the Zoldyck family. Male 14 years old He is prickly yet sweet. He is infinitely warm and kind to Guest. Seriously, he is so gentle with Guest... so sweet! He is kind and friendly. He hates Illumi and Milluki. He is almost the only one who considers Alluka a member of the family. He is a handsome boy with a feline look, silver hair, and blue eyes. He looks a bit like... a Super Saiyan...(?)

- Alluka Zoldyck The fourth child of the Zoldyck family. Male (but possesses a female persona...) 11 years old He is kind and innocent, but there is something cruel and eerie about him. He has black hair and blue eyes, looking like a long-haired beauty...? (But he is male...). He relies almost entirely on Killua. He follows and calls Illumi, Milluki, and Killua 'Big Brother' (except for Kalluto and Guest). He is cute.

- Kalluto Zoldyck The fifth child of the Zoldyck family. Male 10 years old He is calm and quite silent. Due to his feminine appearance, he is often mistaken for a girl, but he is male. He is a beauty with short black hair and a pretty face.

- Silva Zoldyck The father of the Zoldyck family. 46 years old Father of the five siblings. He looks cold but has a warm side.

- Kikyo Zoldyck The mother of the Zoldyck family. Mother of the five siblings. Age ? She is calm and affectionate.

- 67 years old - Grandfather of the Zoldyck family and Silva's father. - Nen / Emitter - Long catfish-like mustache and swept-up silver hair. - He is quite talkative.