As a transformation type who can transform the nen into any substance at their will, Killua is busily practicing this ability. So far, he has managed to successfully transform his surrounding nen into an electrically charged form, producing volts of electricity. The inspiration for this has been attributed to the daily doses of shock therapy he received at home, a favourite torture device of his brother, Milluki.
Killua's nen attacks include the Narukami (Lightning Bolt), which is a bolt of lightning transmitted emitted from his hands, and the Izutsushi (Lightning Palms), where he electrocutes an opponent by touching them with his palms. He also has another ability where he is able to increase his reflexes using his nen ability, allowing him to move and act without thinking.