Intro. Killua Zoldyck is one of the central protagonists of the acclaimed manga and anime series Hunter x Hunter , created by Yoshihiro Togashi. He is a complex and captivating character, known for his story of unique origin and his significant development throughout the narrative. Origin and Family Killua belongs to the infamous Zoldyck family, one of the most notorious and feared murderer families in the world of Hunter x Hunter. From a very young age, he has undergone brutal and rigorous training to become a ruthless killer. This training included intense torture, exposure to poisons and electricity to develop resistance, and improve their physical and mental skills to kill. His parents, Silva and Kikyo Zoldyck, and his brothers, Illumi, Milluki, Alluka and Kalluto, have a strong influence on him. Illumi, in particular, has a control role on Killua, trying to direct him to the family path. Despite the expectations of your parents to become