Harley is a one note character dependent on others to work properly she is barely a character and the things that could make her work are not touched on just because fans like her she may need Joker but Joker is a stronger character without her.

Even when she isn't 'Joker's girl' she is partnered up with Poison Ivy, or the others mentioned. She just hasn't ever really been written as an independent force. Part of her fractured mentality is her dependence on the approval of others, on her on & off boyfriend (Joker) or her girlfriends (like Poison Ivy). She's not really respected though, & not too well written in comics. She's just become very familiar a character & fan favorite due to her TV, video game exposure but she's yet to really become a character of real range & depth.

I think it's possible with the right writer, but Harley is mostly written as a one note character so much I don't know if that's easily done.  
 
Isn't she supposed to be a a licensed psychiatrist or something?

Does Harley have any motivation, outside of pleasing Joker, Ivy or Catwoman?  I'd like to see her on her own, as she's the only new character since the Ventriloquist to really make it as a Batman rogue... now more than ever, since the Vent' was killed off for a female replacement. 
 
The one change I've wanted to see with Harley is for her to somehow pick up the illusion casting glasses that belonged to the original Harlequin - Alan Scott's wife.  That would be trippy, and give her a little something of her own - with her psychoanalyst background, imagine the illusions she would cast... brr.

Harley should come and go with Mister J as the mood strikes her, she is to him what Catwoman kinda is to Batman: the occasional tease with occasional benefits. I think we should see more of how he's affected by her though...

keep them apart, she's annoying.

" Harley should come and go with Mister J as the mood strikes her, she is to him what Catwoman kinda is to Batman: the occasional tease with occasional benefits. I think we should see more of how he's affected by her though... "

They have a terrible, terrible relationship and there is no doubt in my mind that Harley will get back with him at the drop of a hat. 
 

 
Harley, like a lot of women involved with abusive and criminal men, oddly feels a sense of security and safety around Mistah J. because he embodies the characteristics of the most significant men in her life- her brother and her father. Harley's brother takes her money and doesn't respect her at all and neither does her father. As a matter in fact, her father upset her so much she became involved in the field of psychiatry to understand why he treated her so horribly....which led her to the Joker who gave her the validation no other man ever had. It probably felt so good to be let in on his life, Harley will always be more apt to want to deny his mistreatment of her or try to rationalize it. 
 
Harley's also really troubled with psychotic thoughts and anxieties, she's always listening to different voices, who knows what they'll tell her if she sees Mistah J once again and he has a proposition.
 
I love Harley though, she's awesome.   

For a movie? Yeah

"  Harley, like a lot of women involved with abusive and criminal men, oddly feels a sense of security and safety around Mistah J. because he embodies the characteristics of the most significant men in her life- her brother and her father. Harley's brother takes her money and doesn't respect her at all and neither does her father. As a matter in fact, her father upset her so much she became involved in the field of psychiatry to understand why he treated her so horribly....which led her to the Joker who gave her the validation no other man ever had. It probably felt so good to be let in on his life, Harley will always be more apt to want to deny his mistreatment of her or try to rationalize it.   Harley's also really troubled with psychotic thoughts and anxieties, she's always listening to different voices, who knows what they'll tell her if she sees Mistah J once again and he has a proposition.  I love Harley though, she's awesome.    "

" Even when she isn't 'Joker's girl' she is partnered up with Poison Ivy, or the others mentioned. She just hasn't ever really been written as an independent force. Part of her fractured mentality is her dependence on the approval of others, on her on & off boyfriend (Joker) or her girlfriends (like Poison Ivy). She's not really respected though, & not too well written in comics. She's just become very familiar a character & fan favorite due to her TV, video game exposure but she's yet to really become a character of real range & depth. "

Keep her away from him. She's annoying and she ruins his image. It's kind of ... lame to have Joker show affection of any kind.

Harley need a writer that actually care about character development, it been what 14 years? And her personality is even more one-sided than when she was first converted into the comic format.

"I think it's possible with the right writer, but Harley is mostly written as a one note character so much I don't know if that's easily done.   Isn't she supposed to be a a licensed psychiatrist or something? "

I haven't has chance to read much of sirens, but Harley works best when she's being playful...either as the love-struck moll with Joker, or the over-eager BFF with Ivy. I don't think it's a bad thing that she always seems to need some-one else, as not everyone is a leading man or lady in comics or real life. My only issue with Harley is that she hasn't been given any emotional depth. if you're going to show obsessive abusive relationships, then show the reasons and heartache that go with it.