Killua was born as the middle child to a family of known assassins, the Zoldyck Family.cheeky, cheerful, and full of mischievous ideas. afraid of being too weak to protect Gon.Killua Zoldyck is the deuteragonist of the anime/manga series Hunter × Hunter.Electric Shock: Killua's shock-resistant body allows him to transmit the electricity he generates from his body to shock anyone on contact. This, paired with his super speed and instantaneous reaction time make it nearly impossible to fight him.