I really like the idea of different costumes, even having the different costumes having different effects on the player. Like Dr. Mario could be one of Mario's costumes and he would throw pills instead of fireballs with the pills and fireballs having a different effect on other players (different damage %, knockback, etc.). And Samus' different suits could be more resistant to different things (Varia suit would have reduced damage to fire, Gravity suit reduced knockback from water, etc.).
But I don't see how they could equally have different costumes for each character. Like what other costumes could Donkey Kong or Diddy have? They'd have to make some up.
lol
