Killua Zoldyck (キルア゠ゾルディック, Kirua Zorudikku) is the third child of Silva and Kikyo Zoldyck and the heir of the Zoldyck Family, who is a family of assassins, until he runs away from home and becomes a Rookie Hunter. He is the best friend of Gon Freecss and is currently traveling with Alluka Zoldyck.
He also has lightning abilities and uses a Yoyo as a weapon. He is extremely agile and intelligent.
"I'm so tired of killing... I just want to be a kid. Hanging out, doing stuff with Gon. That's it." 