Batman faces a variety of foes ranging from common criminals to outlandish supervillains. Many of them mirror aspects of the Batman's character and development, often having tragic origin stories that lead them to a life of crime. These foes are commonly referred to as Batman's rogues gallery. Batman's "most implacable foe" is the Joker, a homicidal maniac with a clown-like appearance. The Joker is considered by critics to be his perfect adversary, since he is the antithesis of Batman in personality and appearance; the Joker has a maniacal demeanor with a colorful appearance, while Batman has a serious and resolute demeanor with a dark appearance. As a "personification of the irrational", the Joker represents "everything Batman [opposes]". Other long time recurring foes that are part of Batman's rogues gallery include Catwoman (a cat burglar antiheroine who is an occasional ally and romantic interest), the Penguin, Ra's al Ghul, Two-Face, the Riddler, the Scarecrow, Mr. Freeze, Poison Ivy, Harley Quinn, Bane, Clayface, and Killer Croc among others. Many of Batman's adversaries are often psychiatric patients at Arkham Asylum.
Harley Quinn: Best known as "The Joker's Girlfriend", Harley has had occasional romantic encounters with Batman, most notably her kiss with him in the episode Harley's Holiday from Batman: The Animated Series. Recently, in the The New 52, there have been a couple of stories in which Harley became infatuated either with Bruce Wayne or Batman. These attractions appear to be entirely one-sided and Batman has shown no signs of attraction towards Harley.
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