Re: Which characters do you think will appear in "Agents of S.H.I.E.L.D.?"
I *want* anybody and everybody to appear in SHIELD, but that ain't likely. I'd be surprised if any top-tier characters ever showed up, because there remains the problem of just how much interplay there's going to be between TV and movies. For the most part, Whedon downplays that, and for now, it's unlikely that any TV character is going to make the jump to the big screen, and just as unlikely that any Marvel character from film is going to "slum" with the TV crew (Coulson notwithstanding).
In a perfect world, the two will be interchangeable; but I'm not about to bet on it.
So for now, I'd only look for lower-tier characters to show up, and only sparsely at that. The evidence shows that they're primarily interested in creating brand new characters on both the hero and villain side.
THE COTTON AVENGERS
...They move like slick cotton on oil.