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Brown: Not based on anything.
Dark/Orange: Not based on anything.
Pink: Not based on anything.
Shiny Blue: Based on his design in Mystery of the Emblem.
Orange: Not based on anything.
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Yellow: Luigi's yellow costume in Smash 4. The one in Beta looks a bit too green, but this one fixes that.
Green/Green: Based on Mario's appearance in the Game & Watch title Mario's Bombs Away. Also resembles Luigi's appearance in Super Mario Bros DX.
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Green: Based on Link's appearance in Ocarina of Time.
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Shiny: Based on their appearances in Ocarina of Time.
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Sky Blue: Based on his appearance on the NES.
White: Based on a ghost. Spooky.
Green/Purple: His old Fanta costume in 0.9a.
Brown/Blue: His old Opposite costume in 0.9a.
Magenta/Cyan: His old Orko costume in 0.9a.
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Blue: Based on his blue costume in Monkey Smash in Donkey Kong 64.
Purple: Based on Bonkers from the

series.
Grey: Based on his look in Donkey Kong Land in a monochrome Game Boy.
Transparent: Based on a dead meme.
Red: Another take at a red donkey kong.
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Yellow: Based on his appearance in Melee/Star Fox 64.
Cyan: Based on his Cyan costume in Smash 4.
Pink: Based on his pink costume in Smash 4, which it's based on Krystal's appearance in Star Fox Command.
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Red: Based on Darumaka.
White: Not based on anything.
Pink/White: Based on her colors in Gen I, on the Super Game Boy.
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Black: Based on Black Goku and Turles.
Blue: Based slightly on Vegeta.
Purple/Green: Based on Piccolo.
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A lot of Ichigos. Really hard to work with.
Only three have real origins.
Black/Cyan: Based on Gintoki Sakata, that guy from Gintama.
White/Black: Based on Hollow Ichigo but with gross shading.
Red/Black: Based on Renji.
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Pink/Fuchsia: Based on his colors in the NES.
Orange/Green: Based on a spooky Pumpkin. Spoopy.
Green/Orange: Based on Green Kirby from Amazing Mirror.
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Red/Brown: Based on his appearance in the NES.
Blue: Based in Shadow Mario.
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Grey: Based on Spunky.
Green: Based on Orson.
Eyesore Blue: Based on the color of the ghosts when they turn blue.
Red: An alternate take at a Blinky Costume. This time with purpleish gloves.
Black: Based on nothing. It's an Alt about Nothing!
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Based on his appearance in the NES. Given how he directly mimics the limited movement of the NES games it'd make sense for an alt like this.
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White/Red: Based on Fire Peach.
White/Blue: Based on the Nautica Dress' artwork in Super Mario RPG.
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Based on

's appearance in the Super Game Boy.
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Purplish: Based on his colors in the Genesis.
Cyan: Based on Classic Sonic.
Yellow: Based on SUper Sonic.
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Based on his colors on the Virtual Boy.
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Black: A revamp of my old Black Yoshi.
Grey/White: A revamp of my old White Yoshi (looks more white in the sprite)
Bright Green: Based off his appearance in most Yoshi games.