Killua Zoldyck is the third child of Silva and Kikyo Zoldyck, and the heir to the Zoldyck Family until he runs away and becomes a Rookie Hunter. He is Gon Freecss’ best friend and is currently travelling with Alluka Zoldyck.
He has played the role of the series’ deuteragonist in the arcs Heavens Arena, Greed Island, and Chimera Ant. He played the main character in the 13th Hunter Chairman Election arc. He was also the tritagonist in the Hunter Exam and Yorknew City arcs.