DC Bombshell Batwoman, Tony Stark, Professor Pyg(?), and Harley
Mortal Kombat's Kung Lao
Harley Quinn (Lisa Lou Who)
Young Justice Superboy and Miss Martian
Another Harley and Ivy
Puffy Green Lantern and Zatanna
Batman giving thanks
Best for last? The Belcher family
I can't seem to get just a single flickr album to work as a gallery, and pasting a single photo's URL seems to create a gallery that gives access to my entire flickr camera roll, including private photos. No imgur account, so photobucket it is for now. I'll try to set up an imgur account and edit this later. Let me know who I mis-identified.
Guy with Grifter is supposed to be Red Hood, I think.
Yes, that's Professor Pig circa the last Arkham game. The black and red Batwoman is from an Elseworlds story where there was a woman during WW2 who fought crime in that outfit as "The Bat Woman". It's a play on the pinup art of the era.
Guy with Bane is not from Payday 2, but maybe Army of Two?
You're absolutely right about the scope, but given the awkward fitting of the costume, plus the color pattern, it just strikes me a someone who is trying to get as close to Deadshot as possible who might not have the budget or experience to be more accurate. Plus, he's hanging out with Bane.
Aside from the scope, it's not that far out of possibility: