About Killua Zoldyk:
Killua Zoldyk is one of the main characters in the anime "Hunter x Hunter"
Killua is Gon's best friend and met Gon in the hunter exam along with Kurapika Kurta and Mr. Leorio
His whole family is a group of assassins and were raised to be assassins. However Killua resigned as an assassin in order to live a happy life with Gon instead of being stuck inside with family members he hates.
Killuas family:
Killua has a total of 5 siblings that we know of which are Illumi, Milluki, Alluka, Kalluto and obviously himself.
His fathers name is
Silva Zoldyck who is also head of the family
His Mothers name is
Kikyo Zoldyck
Killua also has a grandfather and his name is
Zeno Zoldyck