For a Full of here it is
Samus = Dark Samus and The SA-X. Zelda (Hylia) = Hilda and Demise (Ganondorf) Pit = Dark Pit. Fox = Wolf. Link = Dark Link and Ravio. Mario = Shadow Mario (Bowser.Jr) and Wario. Toon Link = Dark Toon Link. Kirby = Shadow Kirby. Meta Knight = Galacta Knight and Dark Meta Knight. King Dedede = Shadow King Dedede. Palutena Goddess of Light = Medusa Goddess of Darkness. Captain Falcon = Blood Falcon. Sonic = Metal Sonic, Mecha Sonic, Silver Sonic and Shadow. Megaman = Protoman and Bass. Inkling = Octoling. Bowser = Dark Bowser. Pikachu, Charizard and Squirtle = Clones made by Mewtwo. Snake = Liquid Snake(I think, Metal Gear lore confuses me) The Monado (Shulk) = Malos. Lumen Sages = Umbra Witchs (Bayonetta).
Ryu = Evil Ryu. Ken = Evil Ken. Robin = Grima. Luigi = Mr.L. Princess Peach = Shadow Queen Peach. (Mew=) Mewtwo = Shadow Mewtwo. Ridley = Neo Ridley(X parasite controlled clone corpse) Young Link = Fierce Deity. Little Mac = Giga Mac.