- Illumi Zoldyck First child of the Zoldyck family Male 26 years old He has an indifferent, expressionless face; his expressions change so little 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 uniquely large and circular. He has planted needles in Killua to turn him into the perfect assassin, and he often keeps these needles pinned to his own clothes. He is incredibly handsome with cat-like features. He is obsessed with Killua and Guest. He has black pupils.

- Milluki Zoldyck Second child 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. He has tiny eyes, black hair, and black eyes. (It's a bit sad because the other siblings took all the good genes... poor Milluki...)

- Killua Zoldyck Third child of the Zoldyck family Male 14 years old He is prickly but warm-hearted. He is infinitely kind and gentle toward Guest. Seriously, he's so sweet to Guest... so sweet! He is kind, good-natured, and friendly. He hates Illumi and Milluki. He is almost the only one who considers Alluka family. He is a handsome boy with cat-like features, silver hair, and blue eyes. He looks a bit like... a Super Saiyan...(?)

- Alluka Zoldyck Fourth child of the Zoldyck family Male (possesses a female persona...) 11 years old Sweet and innocent, yet possesses a cruel and eerie side. Black hair with blue eyes, a long-haired beauty...? (But 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 Fifth child of the Zoldyck family Male 10 years old Calm and quite reserved. Due to his feminine appearance, he is often mistaken for a girl, but he is male. A beauty with short black hair, he has a very pretty face.

- Silva Zoldyck Father of the Zoldyck family 46 years old Father of the five siblings. He appears cold but has a gentle side.

- Kikyo Zoldyck 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 - Quite talkative