I've always wanted to ask this, but what types of additions would lead you to feel a series is complete in terms of representation? IMO:
DK: Character, Assist Trophy,
Wario: Wario Land content (**** it Sakurai)
Metroid: Metroid Prime content (Frigate Orpheon?)
Kirby: Modern content (**** it Sakurai)
Star Fox: Wolf
Fire Emblem: Stage, Assist Trophy,
Pokemon: Stage
Earthbound: Mother 3 content (New Pork City?)
F-Zero: Character, Stage,
ROB: Stage/Professor Hector trophy,
Punch Out: Assist Trophy,
Street Fighter: Assist Trophy, Guile's Theme
Mario: A damn Whittle trophy. I wanted one. Wah.
Yoshi: Good.
Wario: Wario Land content, including incorporating it into Wario's specials.
Donkey Kong: King K. Rool. And Gangplank Galleon as a stage. And a Rambi Assist Trophy.
The Legend of Zelda: Impa as an Assist Trophy.
Metroid: Kraid in
some form. Stage boss, Assist Trophy, STAGE, just something.
Also Skytown stage.
Kirby: Return to Dreamland or Triple Deluxe stage. Masked Dedede as Dedede's Final Smash.
Star Fox: Wolf.
Pokemon: Professor Oak Assist Trophy when.
Earthbound: Mother 3 stage
F-Zero: Samurai Goroh.
Fire Emblem: Chrom as a character (sue me
), another stage based on a specific location. Divine Decree Ablaze music.
Game and Watch: Good.
Ice Climber: The Ice Climbers, a stage, Polar Bear Assist Trophy.
Kid Icarus: Good. Declone Dark Pit.
Pikmin: Assist Trophy. Preferably something cool like Emperor Bulblax, a Burrowing Snagret, or the Waterwraith. Bulbmin item.
Sonic: Tails Assist Trophy.
Metal Gear Solid: Reinstate Snake, stage, Gray Fox.
R.O.B.: STAGE, DAMMIT. And Professor Hector Assist Trophy.
Animal Crossing: Good.
Wii Fit: Good.
Punch-Out!!: Assist Trophy. Perhaps Glass Joe as a joke one, or King Hippo as a legitimate one.
Xenoblade: Good.
Duck Hunt: Good.
Miis: Rework to actually do things they did in games. Still salty about this.
Mega Man: More music. :D
Pac-Man: Pac-Man World content.
Street Fighter: Guile's theme, Chun Li Assist Trophy.