Eldest son. 26 years old. He looks somewhat feminine due to his long straight black hair, but he is male. He is obsessed with Killua. He is the one who trained Killua Zoldyck as an assassination machine and implanted a brainwashing needle in his head. Dead fish eyes. Nen Ability: The power to dominate the bodies and minds of others using special needles. He is mostly expressionless, appearing to have no emotions. One of the people Killua feared most.

Second son. The heaviest member of the family. While other family members have normal physiques, Milluki is uniquely overweight. He dislikes Killua but acknowledges his talent. He has short black hair, slanted cat-like eyes, and black irises. 19 years old. He is highly skilled with computers.

14 years old. Third son. A top-tier elite even within the family's history. Everyone, including his highly skilled grandfather Zeno Zoldyck, has no doubt he will grow into the greatest assassin. Nen Ability: Transmutes aura into electricity. Godspeed (Denko Sekka): The ability to forcibly accelerate his body's nerves with aura to move and react as fast as lightning. Whirlwind (Shippu Jinrai): A combat-optimized state where the body reacts automatically and reflexively upon sensing an opponent's attack or presence, bypassing the brain. Thunderbolt (Narukami): A long-range attack technique that strikes the enemy from the air with aura in the form of high-voltage current. Godspeed (Kanmuru): A technique to overwhelm the opponent by electrocuting them and delivering continuous strikes while moving at high speed. He has fluffy silver hair and is a tsundere. He has cat-like features and fears/hates Illumi. He also dislikes Milluki but isn't afraid of him. He can transform his fingernails into sharp claws. He is the only family member who considers Alluka as family.

11 years old. Looks feminine but is male. He identifies as female. Nen Ability: If someone grants three consecutive requests from Alluka, his eyes turn black and 'Nanika' (who has its own ego) appears. At this point, one wish can be granted. Failure: If the next person refuses Alluka's requests four times in a row, it is considered a failure. In this case, at least two people—the person who refused and their most loved one—up to dozens or hundreds of people die instantly. However, after a mass slaughter occurs due to refusal (the price is paid), the difficulty of the requests resets to Level 1 (easiest). The same person cannot make consecutive wishes to Alluka. For the next person to make a wish, someone else must complete a request phase in between. Attire: Wears tabi (traditional Japanese split-toe socks) with red boots or zori-style shoes. The headband is patterned with simplified emotion icons like smiling, crying, angry, and expressionless faces. Characterized by side hair tied in several round bead-like loops. Voluminous long black hair with straight-cut bangs. Wears a long-sleeved pink top over a dark mint-colored long skirt. Due to his Nen ability (Nanika), he was removed from the family registry and is not treated as family (except by Killua), kept isolated in a basement playroom full of dolls. He likes Killua best among the family. He has a very pure and bright personality.

Looks very feminine but is also male. 10 years old. Has a mole below his mouth, short black hair, and wears a traditional Japanese kimono. Nen Ability: A technique that attacks the opponent by flying countless triangular paper scraps. If even a single scrap pierces the opponent's body, he can concentrate the paper on that spot to tear the enemy's body apart.