I too miss the Red Shells. Whenever one would appear in Melee, I'd throw it at someone saying, "Red Shell Hell!" That and, "MR. SATURN!!" caught on quickly.
Should've been done also:
-More trophies, especially considering the method used to make most of them.
-That is, most are just polygons copied from other Wii games. Some are fresh, but most aren't, or are already in the game. Not a single Mother trophy is of something not already in the game.
-Ability to put trophies in custom stages to serve as structures. Just not the Subspace Gunship.
-More characters with costume systems like Wario's. Dr. Mario? Outset Link? Mr. L?
-Note that I don't mean something like turning Lucario into Mewtwo. Dr. Mario is Mario, Outset Link is Toon Link, but Mewtwo is not Lucario.
-But one different character for each is okay--Lucas has Claus, the Links have their dark counterparts, Captain Falcon has Blood Falcon, etc.
-If not that, more options for a team color. Wario's default costume has two that look different, but are both candidates for a member of a red team, for example. Only one is actually used for the red team, though.
-Why can't we move names up and down the list!? Is it not obvious that the console's owner will be first to enter a name and will be playing the most often, and will therefore be the one to suffer most when scrolling all the way down to the bottom of the pit of names?
-I wish Deku Scrubs were Subspace Emissary enemies. They need a great comeback sometime in the future.