I won't lie: the Yellow Fur skin for DK makes me think of the Golden Oozaru from DragonBall GT
A few possibilities that come to mind with the palette swaps (that are more viable than "Golden Oozaru") would have to be:
Blue Bowser: Based off Dark Bowser, from Mario & Luigi: Bowser's Inside Story
Black Bowser: Based off Morton Jr.
White Donkey Kong: Super Kong from DKCR
Pink Donkey Kong: Pink DK Jr. from DK Jr. Math
Yellow Link: Pipit from LoZ: Skyward Sword
Green Zelda: Zelda's Palette when beating the original LoZ without any rings
Blue Zelda: Zelda's Palette when beating the original LoZ with just the blue ring
Yellow Ike: Greil/Gawain
Red Ike: Zelgius? The external part of the cape doesn't match, though...
White/Blue Ike: Sigurd? Again, the cape doesn't fully match up, this time the interior
Green Ike: I'd say this is based off the Ally Unit's coloration from the series, either that, or Geoffrey
Black Ike: I've heard Black Knight, but I can't see it
Silver/Blue Ike: Chrom
Orange Kirby: Orange Spray Paint from Kirby & The Amazing Mirror
Black/Yellow Kirby: Maskless Metaknight
Pink Metaknight: Kirby
Dark Pink Metaknight: Galacta Knight
Grey Metaknight: Dark Metaknight from Kirby & the Amazing Mirror
Red Falco: StarFox Assault Falco
Red's Cap Pikachu: Red
Green Bandana Pikachu: Brendan's Bandana (Emerald)
Blue Goggles Pikachu: Pichu's Goggles from Melee
Gold's Cap Pikachu: Gold
Choice Band Pikachu: Choice Band
Red Cap w/Sunglasses Pikachu: Calem's default cap
Red Charizard: Charmeleon
Yellow Charizard: Charmander and Charmeleon's Shinies
Purple Charizard: its Shiny from Gen II (didn't know about this one myself)
Leaf's Hat Jigglypuff: Leaf's Hat from Pokemon FR/LG
Ribbon Jigglypuff: Fairy Tale Trainer's Ribbon from Pokemon X/Y
Nurse Cap Jigglypuff: Pokemon X/Y's Nurse Joy Caps
Pink Greninja: Lickitung
Black Greninja: Shiny
Dark Purple Greninja: Shadow Greninja?
Red & Black R.O.B.: Virtual Boy
White Ness: Fuel from Mother 3
Green Alph: Charlie (Pikmin 3)
Pink Alph: Brittney (Pikmin 3)
Lucina, in order: Standard, Nowi, Cherche, Cordelia, Tiki, Lissa, Tharja, Sumia
That's what I know off the top of my head. I didn't include some because they might have been too farfetched, like the Dark Purple Lucario being another Shadow pokemon