IronFist isn't there. That's SpiderMan. Its Cap, Doom, Spidey, and Skrull on the marvel side.
On Capcom side : Chun Li, Frank? cant really tell since his body seems odd, Maybe Trish and Felicia at the end.
So far characters that are for sure in and by the shadows that gives them away are :
Capcom : Ryu, Chun Li, Chris, Dante, Morrigan, Felicia
Marvel : Cap, Wolverine, Iron man, Deadpool, Hulk, Dr. Doom
That's not Spidey actually… He has a headband... --
Oh wait! No you are right it is Spidey… that's not a headband! That must be a giant spike sticking out of Spidey's head! or perhpas Super Skrull has one really big finger he's jamming into Spidey's brain. Or maybe Spidey is webbing his head! @@
How can you say that's Spidey? -_-
At the most it's someone else, because of the very slight mask wrinkles(points on the 3rd person's head). But, the consensus is it's someone with a headband or a weird thing coming out of their head. Some people think the wrinkles look like horns, so Daredevil, but then that doesn't explain the headband looking thingy.