Initially, Killua is introduced as a character who appears similar to Gon: cheeky, cheerful, and full of mischievous ideas. However, contrasting Gon's politeness, Killua can be quite rude to others, mostly strangers and older people. He is most commonly known for having a sweet tooth; he loves everything sweet and spent almost 200 million Jenny on snacks when he was at the Heaven's Arena. His favorite snack is chocolate, specifically Chocolate Balls.
He is also one of the quickest-thinking characters and often analyzes a situation with great ease and accuracy. In spite of his young age, his way of thinking, knowledge, and pragmatism give him the attitude of an adult. He is initially very confident about his own abilities, going as far as questioning Gon's capability during the Hunter Exam, and compares his strength with other people. As time passed, Killua became humble about it; but when somebody compliments him, especially Gon, he becomes easily embarrassed.
