Alluka Zoldyck is the youngest of the Zoldyck family kids—and arguably the most dangerous. Best known for having the ability to grant wishes, Alluka's powers come with a serious downside: they can trigger massive, brutal casualties. Because of how unstable and uncontrollable these abilities are, the family keeps Alluka locked away in a vault at home behind four separate security doors, each protected by a 10-digit keypad. It's basically maximum-security containment.
There's some ambiguity around Alluka's gender. Killua refers to Alluka as his sister, while the rest of the family tends to use male pronouns. Alluka is 11 years old.
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