Zeno Zoldyck is Killua's grandfather and Silva's father. A sharp-witted old guy whose age hasn't slowed him down—he's still quick-thinking and formidable in a fight. He's best known for his eccentric style, alternating between wearing garments emblazoned with "A Kill A Day" or "Never Retire," depending on his mood.
Zeno has a solid relationship with Netero, the Hunter Committee's Chairman. When things heated up with the chimera ants, Netero brought Zeno on board to help assault Ming Jol-ik's palace in East Gorteau, hoping to catch the King off guard. It's a job that shows how much trust Netero places in him.
Among his grandchildren, Zeno clearly favors Killua—likely because Killua's the family heir and represents the future of the Zoldyck name. Fans often note that this preference shapes how Zeno views and interacts with the rest of his family.
Content compiled by AnimeList.moe from publicly available sources.
