What characters do you hope are going to be in The Suicide Squad?

Now I know the role of Polka-Dot Man has been casted along with possibly Rat Catcher, Bronze Tiger, King Shark and Peacemaker. Naturally with Harley Quinn, Amanda Waller, Rick Flag and Captain Boomerang coming back.

But who else do you hope will turn up in the line up for the team or the villains of the movie?

Would love Captain Cold and some more Flash villains.