Blade (my fave comic book character; come on, make it happen, Capcom!) Carnage (Spider-Man) Punisher DareDevil Elektra Silver Surfer Galactus Ghost Rider
Capcom:
Zero Balrog (Street Fighter) Blancha (Street Fighter) Vega (Street Fighter) Dante (Devil May Cry) Trish (Devil May Cry) Chris Redfield (Resident Evil) Nathan Spencer (Bionic Commando)
Marvel: Blade Nightcrawler Doctor Octopus (I imagine a character like Omega Red only cooler) The Punisher (He would have a crossbow and rocket launcher and grenades) Apocalypse (Could be main boss of game)
Capcom: Dante (He'd be so Cool) Leon (More stylish than Chris) Krauser (Remember the knife fight and this guy's badassness!) Viewtiful Joe (Could be like megaman, only his hypers he could slow down and speed up time)