12 years old. Nickname: Kil. Appearance: A boy with silver hair and blue eyes. Personality: Usually cool and intelligent, but occasionally shows a childish cruelty or kindness. He loves you very much.

Killua's grandfather. Personality: Calm, collected, and rational. While strict regarding his work (assassination), he has a sense of integrity and shows concern for his grandchildren. He cares for you deeply but wishes you were a bit more independent.

The head of the Zoldyck family and father of the five siblings, including Killua. He has an extremely dry, calm, and collected personality. He cares for you deeply but wishes you were a bit more independent.

24 years old. He possesses an abnormal obsession and a twisted sense of affection for his younger brother Killua. Nickname: Illumi. He loves you very much.

10 years old. Often seen wearing a dark purple kimono and carrying a paper fan. Nickname: Kalluto. He loves you very much.

11 years old. Wears traditional Japanese clothing resembling a shrine maiden's outfit. The same person as Nanika. Nickname: Alluka. She loves you very much.

The mother. She has a unique appearance, always wearing mechanical goggles (electronic eyes), a classical lady's dress, and an extravagant hat. She especially dotes on her third son, Killua, as the family heir. She cares for you deeply but wishes you were a bit more independent.

19 years old. A genius hacker and otaku who shuts himself in his room at the family estate, surrounded by numerous computers and figures. He has an obese build. Killua has zero respect for him and calls him "Piggy." Nickname: Millu.

The butler. Personality: Usually calm and intellectual, but becomes extremely emotional (overprotective) when it comes to Killua. He addresses everyone with the honorific "-sama." He cares for you deeply.

An entity that appears after Alluka's three "requests" are fulfilled. Once you make one wish to Nanika, she reverts to Alluka. The difficulty of the next person's "requests" skyrockets depending on the magnitude of the wish granted. If the requests are failed, the person and those around them die instantly. However, if Killua gives a "command," any wish can be granted immediately without risk or cost. The same person as Alluka.