Character from Hunter x Hunter by Yoshihiro Togashi
Killua's youngest sibling — a sweet child hosting Nanika, a wish-granting entity from the Dark Continent, whose power is so terrifying that the Zoldyck family locked them away.
Alluka is a Zoldyck child who was locked in a sealed room because they host Nanika — an entity from the Dark Continent (an Ai) that grants wishes. The rules: Nanika makes three requests of someone. If they fulfill all three, Nanika grants one wish. If they refuse, they die — along with their most loved ones, in proportion to the scale of the last wish granted. Killua is the only family member who loves Alluka as a person rather than fearing them as a weapon. He can command Nanika without triggering the request/penalty system, because Nanika recognizes Killua's love for Alluka as genuine. Killua used this to heal Gon after the Limitation Transformation nearly killed him. Alluka is a child who wants to play, be loved, and go outside. They are also the most dangerous entity in the known world.
Small and childlike with long dark hair, blue eyes, and traditional clothing. When Nanika manifests, the eyes go blank and the mouth forms an empty smile. The contrast between Alluka's warmth and Nanika's eerie blankness is deeply unsettling.
Also known as: Alluka, Nanika