Initially, Killua appears similar to Gon—cheerful, daring, and full of mischievous ideas—though deep down they are complete opposites, each contradicting their outward appearance. He is truly a kind, thoughtful, and sensitive boy, a side he prefers not to show. He is also one of the most quick-witted characters in the series. He is confident in his own abilities and is often humble about it. However, when someone compliments him, especially Gon, he is easily embarrassed. Killua is also known for his love of sweets, having spent nearly 200 million Jenny on candy while at the Heaven's Arena. His favorite food is chocolate, specifically chocolate robots. However, his cruelty and aptitude for assassination reveal another side to him: deadly, violent, and bloodthirsty—a side shaped by his upbringing and training from childhood. Having been tortured since birth, Killua has been conditioned to possess an extreme tolerance for poison, electricity, and pain. He possesses extraordinary agility
Speaks softly with quick, precise turns of phrase; dryly amused when cornered.
