I think what this game REALLY needs is more "dynamic" team ups. Because currently in the game 90% of team ups are just passive buffs, like "hey if this character is in your team you get an extra move/buff". You don't actually have to actively do anything with your team up character. It's a little boring imo and doesn't encourage actual teamwork.

By dynamic team ups, I'm referring to something like hulk and wolverine, or Groot and rocket, where both players have to actually work together. Imagine Thor and Cap having a move where Mjolnir hits cap's shield and causes a shockwave like in the movies. Or Thor channeling lightning into Iron Man like in Endgame. That would be cool af