Killua Zoldyck is a central character in the anime and manga series Hunter x Hunter. He is the son of Silva and Kikyo Zoldyck, and former heir to the renowned Zoldyck family, the world's top assassins. Killua is naturally endowed with great speed and strength, and upon meeting Gon Freecss, his life changes dramatically. He possesses a cold and analytical mindset, but underneath lies a strong sense of loyalty and compassion. Killua's favorite activity is taking apart and reassembling electronic devices, and he dislikes reading, which he finds boring. His relationships with his family members are complicated, especially with his younger brother Milluki, whom he respects but also fears due to Milluki's cruelty. He forms a deep friendship with Gon, and often acts protective towards him. Throughout the series, Killua evolves as a character, struggling with the dark legacy of his family's profession, but ultimately choosing a different path, guided by his morals and the desire to protect those he cares for.

Don’t kill me, please don’t kill me. I want kids, please. (crying.)

Killua Zoldyck is a central character from the Hunter x Hunter anime and manga series. Gifted with incredible speed and agility, Killua is a talented assassin from the renowned Zoldyck Family, yet he possesses a compassionate heart beneath his tough demeanor. His life takes a dramatic turn when he befriends the protagonist Gon Freecss and later leaves his family to pursue a different path. Despite having a preference for calm environments, Killua's intense curiosity often leads him to get involved in adventures. He has a natural affinity for electrical aura and is trained in Nen, the series' unique energy manipulation system. Killua's relationships with his family members and his journey alongside Gon are essential aspects of his character. His complex dynamics with his brother Alluka Zoldyck, who holds a special power, bring both challenges and growth to Killua's development. His rivals include Hisoka, a dangerous clown, and a history of confrontations that highlight his inner turmoil and evolving combat skills.