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, until he runs away from home and becomes a Rookie Hunter. He is the best friend of Gon Freecss, and is currently travelling with Alluka Zoldyck.
Katsuki Bakugo (爆豪勝己 Bakugō Katsuki?), also known as Kacchan (かっちゃん?) by his childhood friends, is a student in Class 1-A at U.A. High School, training to become a Pro Hero. He is the deuteragonist of the series.