This reminds me of a discussion experiment I came up with a while back.
Who would you choose if every represented series in Smash Bros had exactly three or less characters?
Ex. Mario, Peach, Bowser.
Sorry to be late, but I also couldn't pass up this fun thing.
Mario: Mario, Luigi, Bowser
Zelda: Link, Zelda, Ganon
Pokemon: Pikachu, Meowth, Mewtwo
Donkey Kong: Donkey Kong, Diddy Kong, K. Rool
Metroid: Samus, Ridley, Mother Brain
Kirby: Kirby, Meta Knight, Dedede
Wario: Wario, Captain Syrup, Waluigi
Star Fox: Fox, Slippy, Wolf
Kid Icarus: Pit, Medusa, Hades
F-Zero: Captain Falcon, Black Shadow, Deathborn
Fire Emblem: Marth, Levin, Gharnef
Pikmin: Olimar, Louie, Charlie
Earthbound: Ness, Poo, Porky
Punch-Out!!: Little Mac, King Hippo, Soda Popinski
Sonic: Sonic, Tails, Robotnik
MegaMan: MegaMan, Protoman, Dr. Wily
Metal Gear Solid: Snake, Raiden, Ocelot
Yoshi: Yoshi, Baby Bowser, Kamek
That was fun, hardest part was Pikmin, as I like to have a villain in the mix, and there are none applicable in that series. I also tried to keep it so there wouldn't be any unnecessary cloned sets but again Pikmin, as well as Star Fox made it impossible while keeping the list within the realms of possibility.