Now for my actual list.
Mario: MURICA MARIO! (R.I.P. Murica Luigi.)
Luigi: The Orange Costume or the Light Blue Costume. I love them both too much. After those would be Anime Luigi.
Peach: Her Blue costume. I also dig her black and gold outfit.
Yoshi: Light Blue.
Bowser: His Blue one. (I wish it still had the Super Saiyan Hair like his old blue costume though.)
Rosalina: Her default outfit.
Bowser Jr.: Ludwig bby.
Wario: Not Mario. (Since BOTH of my favorite Wario costumes from Brawl had to be removed.. Guess to make room for Mac's 16 costumes. This is my favorite one left though as his Cotton Candy one doesn't look as good as Mario's and the rest are just meh besides his default outfits as those just have to be there.)
Mr. Game & Watch: Blue and the Teal colors.
Donkey Kong: SUPER SAIYAN DK! (The one with the blue tie and yellow fur)
Diddy Kong: His Blue and Light Blue one.
Link: A tie between Fierce Deity and Skyloft Link.
Ganondorf: Ganonsmurf!
Zelda: Her Blue One.
Sheik: MURICA SHEIK! (Inspired by Impa apparently.)
Toon Link: His Blue One.
Captain Falcon: CAPTAIN FABULOUS 2.0.!
Samus: Fusion Suit Color and Dark Samus Color.
Zero Suit Samus: Her default outfit and the blue feminist outfit.
Pit: Light Blue Pit.
Palutena: Blue Palutena.
Marth: Not Roy. (The red hair doe... Where it at?)
Ike: Not Chrom (And his blue one, but I prefer Not Chrom.)
Robin: Blue Hair Guy.
Kirby: Blue Kirby and Naked Meta Knight.
King Dedede: His Light Blue outfit.
Meta Knight: EBIL META KNIGHT! (With the red eyes)
Little Mac: Both of his hoodie outfits.
Fox: The White and Green one. I also like his new black costume and the Wannabe Wolf costume.
Falco: Light Blue with fabulous red boots.
Pikachu: Goggles, Revenge of Partychu (Welcome back, my old friend), and Headband Guy.
Charizard: Blue.
Lucario: Blue with green chest fur outfit.
Jigglypuff: Not really sure. I guess the Serena Hat one?
Duck Hunt: Dalmatian Dog.
R.O.B.: Both of his blue color schemes.
Ness: Blue and Red with eyes on shirt.
Villager: Tired Eyed Blue one.
Olimar: His blue one for Olimar. Default for Alph.
Dr. Mario: The Fabulous Doctor with the Blue outfit and Green Tie.
Dark Pit: His blue color scheme.
Lucina: Her default outfit.
Shulk: HE FEELS IT TOO MUCH... SO MUCH SO THAT HE HAS TO GET NAAAAKED! Swimsuit Shulk. And his blue/red costume.
Pac-Man: Plaid Gloves and Shoes. His only unique costume. XD
Mega Man: Default Blue Bomber.
Sonic: Silvery or Light Blue outfits.
Wii Fit Trainer: Default Male.
Let me know if I missed anyone so I can fix it. c: