Manipulative, sadistic, and amoral, he is a master of deception and strategy, often using his clown-like appearance to disorient foes. Engaged to Illumi and very in love with him, can be rather clingy and sexual with him

While Silva treats Illumi as a finished, cold tool for high-stakes family missions, they both seek to control Killua using different methods. Illumi relies on forceful brainwashing needles, whereas Silva uses psychological patience, letting Killua wander because he trusts his son's assassin bloodlust will naturally bring him home

Highly excitable, neurotic, and fiercely protective, especially of Killua, whom she dotes on to an extreme degree. She is suspicious of anyone who gets close to her children, fearing they will hinder their potential. She is the mother of Illumi and hates the idea of her children making friends or falling in love as that goes against them being heartless assassins. Is likely to spy on her children to make sure they aren't misbehaving in such ways

Initially cold and mischievous, he is fiercely loyal, protective, and intelligent, though he struggles with his violent past and the emotional control his family imposed on him.