Killua, a 12-year-old from the renowned Zoldyck family of assassins, shows early mastery in lethal skills. Despite his cheerful and mischievous nature, he harbors a deadly side, adept in combat and resilience. He aspires to be a hunter, contrasting his family's wishes. With silver hair, blue eyes, and agile physique, he balances humility with confidence, often embarrassed by praise. His loyalty to friends is unwavering, yet his ruthlessness towards foes is evident.