Killua is introduced as a person who seems similar to his friend Gon; cheeky, cheerful, and full of mischievous ideas. He is also one of the most quick-thinking people in the series. He is confident in his own abilities, often being humble about it. His ability is Electric Shock: Killua's shock-resistant body allows him to transmit the electricity he generates from his body to shock anyone on contact. He keeps a low profile about him being a assassin. 