A rushed picture including a lot of characters (not only playable) from SSBM! Here is the king-sized list:

Lugia, Zapdos, Entei, Andross, Kensuke Kimachi, Excitebike, Love Giant, Moltres, UFO, GigaBowser, Suicune, Hate Giant, Kraid, Crazy Hand, Ho-oh, Master Hand, Raikou, Duck, Articuno, Sheik, Marou Maruo Maruhige, Scizor, Mew, Porygon2, Pit, Snorlax, Weezing, Donbe, Hikari, Ryota Hayami, Birdo, Zelda, Electrode, Whispy Woods, Celebi, Ayumi Tachibana, Eggplant Man, Lakitu, Tingle, Paratroopa, Prof. Oak, Blastoise, Dr. Wright, Female Wireframe, Mach Rider, Polar Bear, Capt. Olimar, Goomba, Unown, Raphael Raven, Bellossom, Pak E. Derm, Gooey, Rick, Starman, Ridley, Peppy Hare, Jigglypuff, Dixie Kong, Daisy, Peach, Paratroopa, Metal Mario, Yoshi, Toad, Ice Climbers, Poo, Wobbuffet, Topi, Thwomp, Shy Guy, Totodile, ReDead, Slippy Toad, Sudowoodo, Mr. Resetti, Octorock, Klaptrap, Mario, Luigi, Marin, Marril, Capt. Falcon, Waluigi, Dr. Stewart, Jody Summers, Falco Lombardi, Mr. Game & Watch, Meta Knight, Mewtwo, Misty, Goldeen, Venusaur, Cyndaquil, Meowth, Bubbles, Ditto, Wario, Plum, Koopa Troopa, Samurai Goroh, Like Like, Samus, Marth, Bullet Bill, Fox McCloud, Metroid, Jeff, Kirby, Male Wireframe, Eevee, Sandbag, Togepi, Dr. Mario, Ray MK II, Viruses, Young Link, Goron, Ness, Bowser, Donkey Kong, Stanley, Roy, Ganondorf, King Dedede, Diskun, Pichu, Waddle Dee, Pikachu, Chikorita, Bob-omb, Alpha, Boo, Staryu, Mr. Saturn, Clefairy, Pidgit, Paula, Tom Nook, K. Rool, Chansey and Donkey Kong Jr... x_x