WDWFREAK53
Well-Known Member
From wikipedia:
As portrayed in the comic, she becomes fascinated with the Joker while interning at Arkham, and volunteers to analyze him. She falls in love nearly instantly with the Joker during their sessions. After helping him escape from the asylum more than once, she is caught by her superiors, who revoke her license and put her in her own cell. During an earthquake in Gotham City, she flees and becomes Harley Quinn, the Joker's partner-in-crime
Ya know...it wouldn't be a bad choice (as a sub-villain)...if the Joker was to come back (which I'm sure he's not).