Now, the battle between Wolverine and Ryu is more than enough to get my attention, especially considering the art aesthetic of the game. What I find funny though is Chris Redfield attempting to stop the Incredible Hulk with a pistol. Clearly, he's not quite familiar with gamma-powered green-skinned behemoth.

EDIT: After investigating a little further with the images, I think we can deduce several other characters including: Dante from Devil may Cry, Frank from Dead Rising (both on the right), Chun Li behind the Hulk, Doctor Doom and a Skrull on either side of Captain America in the upper left, and Felicia from Darkstalkers kneeling in front of them.