>>113197775Characters are only as good as any given writers/artists, but Harley Quinn was an organic thing. Another Joker gf could be fine, but she looks like kind of a generic serial killer type right now. It's hard to manufacture something like the B:tAS Harley success.
I honestly don't know what would work. Maybe some kind of foil? It could be a violent killer who kills out of a sense of righteousness instead of for the lulz like Joker, or a more Zzaz seriously fucked up in a real life sort of character, or a rival though romantic partner with a different murderous "sense of humor," or a dedicated hit woman who takes killing seriously, to make a foil and partner work. Of course, why Joker would hang out with anyone for more than a half a caper or so is never going to really make any sense no matter who they are. He only cares about Batman.
So this character could work and go anywhere, but if they stick to an edgy generic slasher girl, I don't think it's as likely she'll be enduring. Though she could be. Who knows? It's too soon to tell.
