Fuck, I would have preferred redeemed Harley Quinn over what we got. Quinn on her meds but still schizo. Also, as a romance option for Jason. Just to piss off Harley x Poison shippers. It would work too. Jason had his own problems due to the Lazarus pit, and was just as crazy because of it. Add a psychosis mechanic when playing as him, and make him have the option to spare or kill enemies. Which determines whether he stays as Red Hood or takes on another mantle reflective of the fact he stopped using lethal force. They both got fucked screwed over by the Joker, and they could have bonded in a weird way because of it. Shared trauma.