Actually, Beware the Batman might have been the only animated batman show i feel could feasibly have worked in characters like Victor Zsasz. They already had Professor Pyg and some other really freaky ones, what's impossible about Zsasz? Honestly, that show probably would have done Preston Payne as Clayface, too. A weird man who melts people and loves a mannequin is disturbing, but I feel like that show would've done it. I could even see some of those other really freaky ones, like The Flamingo or whatever. I'm not saying I would have loved it if they played it straight, but the show never did. They found ways to sanitize characters while keeping some of that darkness.
Instead of being an animalistic cannibal, a character like Flamingo could've just been a flamboyant spanish mercenary with a love for violence. I don't love the show (because again, I prefer my stuff to be sillier and lighter), but I could imagine some concepts for a season 2. It's not too hard, because the show was basically dark but not too dark. And I can work in that sphere. I can't work in the world of that new adult batman animated show, because that's too much. But I can work in the world of Beware the Batman. I kind of wish we could get some sort of conjoined retrospective on the three batman shows of the 2000s and 2010s, but I can save that thought for another time.