What does Harley Quinn sees in the Joker?

“Harley Quinn sees him as someone who needs to be examined. Why? Because she's a psychologist and she's never met anyone like him! You might argue- “But I'm talking about Harley Quinn, not the prequel version!” Lego Joker voice(in my head)- “O! About that! read more

Because she’s a psychologist and she’s never met anyone like him! You might argue- “But I’m talking about Harley Quinn, not the prequel version!” read more

Harley also appears in "Harley Quinn's Revenge" expansion, seeking revenge on Batman for the death of the Joker. By this time, Harley has dyed her hair completely black and wears almost all black, with a "J" necklace and mourning veil. read more

So overall, how much the Joker feels for Harley Quinn is dependent on the writer, although I personally think that he cares for her as much as anyone as insane and psychotic as the Joker can care for someone. read more