I actually really liked Origins, but the game gave me a lot of problems, and, when the devs said "we'd rather make new DLC to sell you than fix our broken game," that's when I said "**** it. If they don't give a **** about their product, neither do I." Truthfully, I think their version of Bane might be one of my favorite anywhere. I dig the leather jacket look and I found him to be infinitely superior to pinhead 'roid rage Bane from Asylum and City, but, honestly, I just will never support anything from Origins and I'd prefer to pretend it didn't exist.
As for characters I'd like to see, off the top of my head, from Arkham Knight: Scarecrow, Catwoman, The Arkham Knight, Joker, and Two-Face, and, from Arkham City, Mr. Freeze.