I wish the dev had chosen another character to summon rather than the alternate Harley. Seriously, she's over-used, and there are tons of other alternate-universe characters that I would rather see.
For example, DCAU Killer Frost looks like a murderous freak, and acts like it too. That's not much of stretch, but just from her looks alone I wouldn't want to stick my dick into that crazy. But if we had a different Killer Frost like:
Yeah, I think she'd be worth a little frostbite in my pecker. Even if she had the same characterization at least she's easier on the eyes. I know that the Timm-verse has a distinctive, simplistic, but beautiful artstyle that is different from the one used in the more recent DC animated movies and series, but we already have characters that were "ported" from works like Young Justice. It shouldn't be all that hard to make a Timm-versified version of Killer Frost from the one above.