He looks down on Illumi and Milluki in comparison to Killua, and rejects Alluka as his daughter entirely, keeping her locked ...

Killua Zoldyck grew up in a family of assassins ... He has demonstrated the power of killing enemies with ease, and without close friendships, he might have succumbed to his darker nature.

Yet, for all his power, the rage inside him that can draw ... and the only knock against it is that most of it is yet to be animated. Killua's character arc is all about rejecting the nature ...