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.
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.
Green: Based on Link's appearance in Ocarina of Time.
Shiny: Based on their appearances in Ocarina of Time.
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.
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.
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.
Red: Based on Darumaka.
White: Not based on anything.
Pink/White: Based on her colors in Gen I, on the Super Game Boy.
Black: Based on Black Goku and Turles.
Blue: Based slightly on Vegeta.
Purple/Green: Based on Piccolo.
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.
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.
Red/Brown: Based on his appearance in the NES.
Blue: Based in Shadow Mario.
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!
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.
White/Red: Based on Fire Peach.
White/Blue: Based on the Nautica Dress' artwork in Super Mario RPG.
Based on
's appearance in the Super Game Boy.
Purplish: Based on his colors in the Genesis.
Cyan: Based on Classic Sonic.
Yellow: Based on SUper Sonic.
Based on his colors on the Virtual Boy.
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.