Harley often hides her demented mind behind a childish exterior, which she can combine with the flirtatious demeanor of a woman who is aware of her good looks and will use them to get what she wants. She is also much more intelligent than she lets on, often causing friend and foe alike to underestimate her — in the Mad Love storyline, she came closer to killing Batman than the Joker ever did with Batman even mocking Joker for that — and some incarnations even have a genius level IQ, 