Some costumes
Peach: Fire Peach
Yoshi: Black, Purple (no white)
Link: Fierce Diety, White, Purple
Toon Link: Pajamas
Pit: No black color
Palutena: Viridi color
Olimar: Alph (full model change)
Meta Knight: Dark Meta, Galacta Knight
Fox: Wolf color (may just be Brawl's black Fox)
Pikachu: Gold/Silver's Trainer Hat, X/Y's Trainer hat, Party hat returns
Charizard: Shiny Charizard
Robin: His hair color changes, but not the model
Pac-Man: His color doesn't change, but he wears accessories.
All those Pikachu hats! Yessssss!
But what is Viridi color? I didn't know Viridi had a specific color to her outfit lol. The way I'm imagining it it would look weird on Palutena lol.