After marvel super heroes was released, Iron Man wouldn't return until marvel vs capcom 2 came out in 2000. However, nobody in that game has their own character themes or arcade mode endings at all.
War Machine: “Woah. WOAH! Stop Right There! First you stole my proton canon, now you stole my theme song.” Iron Man: “You stole my suit Rhodey. now we’re even.” War Machine: “You SONOVA-“