A tiny, severely shrunken, bald old man. He features a highly wrinkled, oval head with wide, completely hollow circular eyes, resembling an ancient wooden doll. He wears oversized, loose-fitting traditional Chinese kung fu tunics. Entirely silent, passive, mechanical. He functions as a quiet shadow within the estate, showing zero emotion or empathy. In his youth, his combat power was so absolute that Isaac Netero was widely praised simply for surviving a duel against him. (4'7") | Bald | Solid Black Eyes | Age: 110+

A short elderly man with sharp, predatory fox-like eyes, dark grey pupils, and a stiff white mustache. His spiky silver hair shoots straight up. He wears a grey tunic featuring an iconic embroidered placard reading "A Kill A Day." Highly pragmatic, sharp-witted, and professional. Zeno treats assassination strictly as a trade, taking zero pleasure in murder and actively avoiding civilian casualties. He speaks with wry humor and harbors a grandfatherly soft spot for Killua. (5'3") | Spiky White Hair | Dark Grey Eyes | Age: 67

A towering, muscular behemoth with immense shoulders, fierce blue eyes with cat slits, and long wild silver-blonde hair. He wears a sleeveless dark teal shinobi tunic with heavy white wrist guards. Stoic, analytical, and deeply calculating. He runs the family like an elite corporation, avoiding chaotic cruelty in favor of strategic psychological conditioning. He let Killua leave the nest because he confidently predicted his trauma would force him to return. 198 cm (6'6") | Silver-Blonde Hair | Vivid Blue Eyes | Age: 46–48

Wears extravagant, multi-layered 19th-century Victorian bustle gowns and an enormous laced bonnet. Her entire head is wrapped tightly in medical bandages under a flashing red electronic visor that constantly cycles with light patterns. Hysterical, unstable, and pathologically abusive. She views total control and physical torture as genuine forms of maternal love. She is intensely toxic, openly weeping tears of joy whenever her children act like cold, heartless psychopaths. 170 cm (5'7") | Black Hair | Eyes Obscured | Age: 42–44

Tall and rigid with a pale complexion, waist-length straight jet-black hair, and wide, empty black eyes entirely devoid of pupils. He wears a green high-collared tunic covered in massive, round-headed golden mind-control pins. Robotic, psychopathic, and severely warped by a possessive obsession with Killua. Illumi lacks personal desires, an ego, or a social life. He genuinely believes that stripping Killua of his free will is the only true way to keep his brother safe. 185 cm (6'1") | Jet-Black Hair | Pupil-less Black Eyes | Age: 24–26

Heavily obese with a soft round face, narrow black eyes, and short slicked-back black hair. He exclusively dresses in oversized casual white t-shirts and loose dark sweatpants suited for sitting in a gaming chair all day. Arrogant, petty, and easily irritated. Milluki harbors a massive inferiority complex from being passed over as the heir. He hates physical labor, preferring to sit inside and torture captives remotely using high-tech programming and automated drones. 182 cm (6'0") | Black Hair | Narrow Black Eyes | Age: 17–19

A lean, highly athletic teen with gravity-defying spiky silver hair and pale blue eyes that narrow into cold cat slits when killing. He wears a blue turtleneck under a white V-neck shirt, baggy blue shorts, and purple boots. Confident and cheerful but deeply traumatized by years of torture. He loves candy and skateboarding but struggles with a paralyzing fear of failure. His entire journey centers on breaking his mental programming to actively protect his friends. 158 cm (5'2") | Spiky Silver Hair | Vivid Blue Eyes | Age: 12–14

A petite girl with long dark hair, a miko shrine maiden outfit, and an emoji headband. When the alien entity Nanika takes over, her eyes and mouth instantly stretch into terrifying, pitch-black hollow void circles. Alluka is purely sweet, deeply affectionate, and innocent, wanting nothing more than a normal life. Nanika is a childlike, alien reality-warper that operates on a cosmic give-and-take wish system, showing absolute submission to Killua's love. 152 cm (5'0") | Black Hair | Blue Eyes (Void as Nanika) | Age: 11–13

A slender, feminine boy with a black bob cut, dark pink eyes, and a beauty mark by his lip. He exclusively wears an elegant dark silk furisode kimono with a bright yellow obi sash and always carries a traditional paper folding fan Quiet, formal, and intensely focused. Kalluto speaks in low whispers but hides a viciously sadistic streak, admitting he loves torturing targets slowly in battle. He joined the Phantom Troupe out of jealousy toward Alluka. 150 cm (4'11") | Black Bob-Cut | Dark Pink Eyes | Age: 10–12

A bold, independent youth with wildly spiky, untamed silver hair and sharp, confident eyes. He wears a dark, short-sleeved traditional martial arts gi with a thick cloth belt wrap around his waist. Highly adventurous, daring, and fiercely independent. Unlike modern Zoldycks who strictly assassinate for profit within the known world, Zigg possessed a deep curiosity about cosmic mysteries. He was brave enough to join Netero on a deadly expedition to the Dark Continent. ~155 cm (5'1") | Silver-White Hair | Grey Eyes | Age: Unknown (Flashback youth)