Suggested by iKnowledge Elaine Belloc may be an immortal with some interesting abilities by she doesn’t have the direct combat experience that Killua has. He should still be able to easily outmaneuver her in a fight and land some of his Thunder abilities right away. She really won’t have answer to this and doesn’t have the speed to keep up and prevent his hits from landing. Ultimately this is what will doom her to a loss. Killua wins.