Killua is heavily valued by Illumi and the whole family cuz he is the prodigy child of this generation. White haired Zoldyck children are in line to be the head of the family. Zeno > Silva > Killua
he’s also the only one of the children who is a transmuter, like his father and grandfather. illumi and the crossdresser are manipulators like their mother, fatty doesn’t use nen, and alluka is a specialist, implying that at least to a degree, nen is hereditary.
Killua is heavily valued by Illumi and the whole family cuz he is the prodigy child of this generation. White haired Zoldyck children are in line to be the head of the family. Zeno > Silva > Killua
he’s also the only one of the children who is a transmuter, like his father and grandfather. illumi and the crossdresser are manipulators like their mother, fatty doesn’t use nen, and alluka is a specialist, implying that at least to a degree, nen is hereditary.