We got Capcom's vs. series on Marvel, SNK & Tatsunoko (NOTICED: DC Universe doesn't count do to having a crossover with Mortal Kombat series) and also before Tatsunoko is Capcom X series on Namco, the first up was RPG version of Namco X Capcom in PS2, now there's Street Fighter X Tekken by Capcom & Tekken X Street Fighter by Namco incoming. I wonder if there's a crossover between Marvel & Namco liked a rivalry examples between:
*Wolverine vs. Kazuya
*Captain America vs. Jin
*Deadpool vs. Yoshimitsu (present-day/Tekken)
*Hulk vs. King (II)
*Taskmaster vs. Patroklos (the new protagonist from Soul Calibur V)
*Dr. Doom vs. Heihachi
*Rocket Raccoon vs. Klonoa