Who do you personally think is Green Arrow's archenemy?
The Man, or at least himself. Or maybe whoever the hell decided they’d do a Very Special Episode of his TV show about gun control - one where he, the guy whose defining character trait is that he’s an overtly political leftie, is the mayor - and pull a prissy “All sides have valid points!” ending. I’d already gotten the impression it was the comics character on that show in name only, but at that point, why are they even bothering with a show about Oliver Queen at all?*
Or maybe Count Vertigo. His costume’s pretty snazzy.
* The answer, beyond even the slightest room for question or debate, is because they want to make a Batman show. If Superman coming to Supergirl really does indicate internal restrictions on character use might be loosening (though at this point I wouldn’t bet on it anymore), Arrow is dead the fucking minute they think they might be able to just make the Batman show they want to instead.