Characters in X-Men: The Animated Series and X-Men '97.
- The X-Mennote Professor Xavier, Cyclops, Jean Grey, Storm, Rogue, Jubilee, Gambit, Wolverine, Beast, Morph, Bishop, Magneto, Nightcrawler
- Other Heroesnote Archangel, Colossus, Cable, Ms. Marvel, Longshot, Nightcrawler, Forge, X-Factor, Iceman, Gladiator, Lilandra, Scarlet Witch, Psylocke, Shard, Warlock, Captain America, Madelyne Pryor
- Mutant Villainsnote Magneto, Sabretooth, Apocalypse, Mystique, the Horsemen of Apocalypse, the Brotherhood of Evil Mutants, Silver Samurai, Omega Red, Bella Donna, Shadow King, Black Tom Cassidy, Zebediah Killgrave, Mastermind, the Inner Circle, Fabian Cortez, the Acolytes, Trevor Fitzroy, Proteus
- Other Villainsnote The Sentinels, Master Mold, Henry Gyrich, Bolivar Trask, Cameron Hodge, the Juggernaut, Nimrod, Mr. Sinister, the Nasty Boys, Graydon Creed, the Friends of Humanity, General Chasen, Mojo, Spiral, the Savage Land Mutates, Lady Deathstrike, Erik the Red, D'Ken, Garokk, the Phoenix, Deathbird, Sauron, the High Evolutionary, the Phalanx, Arkon, the Red Skull, X-Cutioner
- Other Charactersnote Moira MacTaggert, Robert Kelly, The Morlocks, Illyana Rasputin, The X-Ternal, Heather Douglas, Rusty Collins, Boom-Boom, Skids, Taki Matsuya, Dazzler, Amelia Voght, Bender, Sunspot, Val Cooper