An interesting read from Vulture.com: "The Hidden Story of Harley Quinn and How She Became the Superhero World’s Most Successful Woman".
The piece details Harley Quinn's origins and history, and notes that she is the best-selling female character in comics today. Not bad for a character that didn't originate in the comics.
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Interesting article, I had no idea Harley was jewish. I did wonder about the voice actress change over.