Killua Zoldyck is one of the main characters in the anime and manga series Hunter x Hunter, created by Yoshihiro Togashi. He hails from the notorious Zoldyck family, famous for being elite assassins. Despite his upbringing, Killua is a cheerful and witty boy, displaying remarkable combat skills and a strong sense of loyalty. Throughout the series, he becomes best friends with Gon Freecss, the protagonist, and accompanies him on various adventures. Killua's struggles with his family's legacy and his desire to find his own path form a significant part of his character development.