Mr. "Get back!" himself, Dante. He is such a fun character. Swag combos with him are some of the coolest ("everything but the kitchen sink combos").
Dormammu is definitely my favorite character in Marvel 3. TIME TO RUN THE OBSTACLE COURSE when he's got spells stocked. Sit there and lame you out with similarly-styled projectile assists (Doom missiles, "Captain Commando" Dante Jam Session, etc). Or, if you're Zak Bennett or one of the newblood Dorms, I'm gonna rush that **** down with teleport mixups and assists and all kinda of flaming junk! He's really, really fun to play/watch.
Smooth Criminal