Replace the Dragoon from the previous recipe with the Parasol, Tingle's Balloon makes a fine addition to any Smash recipe (makes you lighter until it pops or it is popped. :D), and pigs (act as Bonsly, but without Pokeball. If Toon Link is removed, which I could care less about one way or another, make it Star Tropics representation as opposed to Zelda?).
Add one Lip, one Balloon Fighter, one EBA or Ouendan character (Agent J recommended, unless you have alternate costumes to include both Ouendan teams, which would be pretty sweet), a little bit of Andy never hurt anyone (Except the BLACK HOLE ARMY! BAAA-ZING!), switch Lucario for Mewtwo and switch PT's Pokemon for the newest gen's starters, and I want to see some more Little Mac, but I can't think of a use for him (Have sets in mind for all others).
Also, for good measure, I'd add a Mike or Zoda assist trophy, make the Advance Wars trophy not suck, add a trophy that will turn against the user (Same with Pokeball, please?), and a better choice of Pokemon for the Pokeballs is always a good thing (no fun if more than half are legendaries).
To the adventure mode goes more nostalgic enemies/bosses and gameplay that differs slightly from Kirby Super Star, and maybe a clearer story with more involvement for all characters (As opposed to throwing a hedgehog and some random blue god-thing to break its wings and stop it from 360'ing our characters with the red rings of death because we couldn't find a place for him).
Stir in more informational historic trophies (or add descriptions to stickers as an alternate) for a good blend of learning and fun.
Throw in some Board the Platform, some Race to the Finish and character-specific Target Tests (as well as universal ones) to spice up the flavor.
Make a more in depth custom stage builder with editable backgrounds, and we've got ourselves a delicious Smash.
That's my recipe. If everything I posted wasn't in here before, then that's very unfortunate. But I only put the stuff I wanted to see here, I said very little of what I didn't want back. Also, I'm not one for heated debates, so don't yell at me please? XD I'll probably forget I posted here, so I guess you can pm me for special information on my plans. Or IM me, whichever. Whee.
![Stick Out Tongue :p :p](/styles/default/xenforo/smilies/tongue.gif)