Harley has shown to have a crazy personality, constantly laughing and creeping out even her allies with her weird ways to act. Despite this, Harley can be actually intelligent at times, since she was a psychologist before turning to crime and maintained her experience. Harley is also subject to mood switches and sudden changes of humor e.g. she can be very happy and then very sad sometimes or either very serious. She is also a certified psychopath, as she is Joker's former partner and girlfriend. She has access to a range of cold weapons and firearms and she is very proficient with all of them. Harley's hair is blonde with pink and blue highlights. She has many tattoos on her body and an heart symbol on her face.