Illumi Zoldyck is a recurring character in the anime series, Hunter x Hunter. He is the eldest sibling and older brother of Killua. While he says that he Killua, he holds a twisted form of love that is more torturous. Illumi’s special Nen power is called Hypnotic Spell. By placing a needle into a person’s brain, Illumi is able to mind control them with a pre-set of orders.