My hopes for alts:
Mario: Full; replace Fire Mario color for yellow color from vBrawl
Luigi: Dr. Luigi
Peach: Dark Queen Recolors, Wedding Peach.
Bowser: Dark Bowser, Meowser
Donkey Kong: Boxing DK Recolors
Diddy Kong: Another Kong's outfit (Funky, Chunky, etc.)
Yoshi: Full
Wario: Possibly in need or replacements for some colors.
Link: White OoT Link recolor
Zelda: Melee Zelda w/ recolors
Sheik: Melee Sheik with recolors
Ganondorf: Melee Ganondorf w/ recolors
Toon Link: Conductor outfit
Samus: One of her other suits (Light, Dark, Fusion).
ZSS: A recolor to match the new Samus suit, or Justin Bailey.
Pit: Whatever the **** armor from Uprising.
Ice Climbers: JP boxart (Look at Nana, create Popo that looks similar). (This is a really good idea.)
R.O.B.: Tocksknocks' Wii R.O.B.
Kirby: Purple, Brown, Meta Knight-colored and Carbon-colored Kirbies.
Meta Knight: Quickdraw Meta Knight and Super Star Ultra Hat (Name?)
King Dedede: Masked Dedede or Quickdraw Dedede
Olimar: Mr. President Outfit.
Fox: Full
Falco: Full
Wolf: Pirate Wolf recolors
Captain Falcon: Helmetless Falcon or SNES/90s Falcon
Pikachu: Green Hat from Melee, Red Hat from Smash 64
Jigglypuff: Green Focus Sash from Melee.
Squirtle: Squirtletwo
Ivysaur: "Ivysaurtwo" similar in design to Venusaurtwo
Charizard: Charizardtwo
Mewtwo: More Recolors for Armor Mewtwo
Lucario: Sir Aaron
Marth: SSB4-like design
Ike: Vanguard Ike
Roy: some popular FE design, idk
Ness: Robot Ness
Lucas: Commander Recolors
Game and Watch: White color or Mrs. G&W
Snake: MGS1 or MGS4 appearence
Sonic: Sonic Boom design, SA2:B Battle mode alt outfit