She's the Joker's hench-girl who started off as a throw-away character on the Batman: Animated Series who became a mainstay. She became a part of the Batman comic continuity soon after and has become a favorite among fans. The reason why she's so interesting is that she wasn't just some girl off the street that was found by the Joker. She didn't have a background of abuse or drugs. No. Harleen Quinzel was actually Dr. Harleen Quinzel before she began treating the Joker and slowly had her mind snapped by him. We hear about this kind of thing in the news, but no one is as loveable as Harley. Unfortunately, she's like the pretty cheerleader dating the jerk quarterback. The Joker cares nothing for her, but she stays committed regardless.
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