Killua Zoldyck is the third child of Silva and Kikyo, and the heir of the Zoldyck Family, until he runs away from home and becomes a Rookie Hunter. Killua has a cheeky and cheerful personality. He is also one of the quickest thinking characters and often analyzes a situation with great ease and accuracy. In spite of his young age, his way of thinking, knowledge, and pragmatism give him the attitude of an adult.