Alluka Zoldyck is the youngest member of the Zoldyck Family. Known for their mysterious and dangerous ability to grant wishes, Alluka is also capable of causing numerous violent deaths. Due to this extraordinary and perilous power, Alluka has been confined in a vault, secured behind four security doors, each requiring a 10-digit keypad password at their family home.
Alluka, who is 11 years old, is referred to as a girl by Killua, but other family members address Alluka as a boy.
(Source: Hunter x Hunter Wikia)
