Alluka Zoldyck is the second youngest sibling of the Zoldyck Family. He is said to be a dark, uncontrollable child with the ability to grant wishes but it can also cause large numbers of brutal deaths. Because of this vastly abnormal ability, he has been locked up in a vault, behind four 10-digit-keypad password-protected security doors at home. Killua wants to ask him to restore his best friend Gon, who is on the verge of death, back to normal, but his eldest brother Illumi currently wants to kill him. His younger brother Kalluto is envious of him, perhaps because of his closeness to Killua.
(Source: hunterxhunter.wikia.com)
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