Nice walpaper. Trčs bien!
Without looking external references, I can see King Dedede, Birdo, a Shy Guy, Captain Falcon, Riley (from Pokémon), the Ice Climbers, Waddle Dee, a Metroid over another Waddle Dee, Samus, Cynthia, Paper Mario, Meta Knight, Dialga, Palkia, Giratina, an old Donkey Kong, Darkrai, a small Woopah, Mr. Saturn(s), Lakitu, Kirby, Mona, Jimmy T., Kolorado, Resetti, something like a Quagsire, Bowser, Bow, Moustafa as Sheek, Penguin Patrol, Totakeke, Yoshi, Yoshi with Baby Mario, Mr. Game & Watch(s), Link from Minish Cap, Steven Stone, Link from Wind Waker, Baby Mario crying on a bubble, Ganon, Tingle, the male player sprites of Pokémon LG/FR and Emerald, the boy from Harvest Moon, Popuri, another Link, Wario, the Master Hands, Sonic, 8-bits Mario, a Bumpty being eaten, Ness, Pacman, one of the Ninja Turtles...
The rest etheir I don't remember them or I don't know them.