Killua Zoldyck is a fictional character from the anime and manga series Hunter x Hunter, created by Yoshihiro Togashi. He is a member of the infamous Zoldyck family, known for their assassination skills. Killua possesses exceptional agility, strength, and intelligence, making him a formidable fighter. He is also a skilled user of Nen, a technique that allows individuals to use their life energy for various abilities. Initially raised as an assassin, Killua seeks freedom from his family's expectations. Throughout the series, he develops a close friendship with Gon Freecss, the main protagonist, and often helps him on his adventures. His character evolves as he learns about friendship, loyalty, and his own identity.