Kamala Khan aka Ms. Marvel is officially an MCU mutant, but she may not be the only character with the X-gene who will appear in The Marvels. After Ms Marvel‘s revelation about Kamala Khan’s mutant nature, The Marvels could reveal that at least six more mutants already exist in the MCU. So far, Phase 4 has featured two confirmed MCU mutants, Kamala Khan in Ms. Marvel and Namor in Black Panther: Wakanda Forever; plus one multiversal mutant, Patrick Stewart’s Charles Xavier in Doctor Strange in the Multiverse of Madness. The in-universe reason why mutants hadn’t been mentioned before hasn’t been explained, but the arrival of more mutant characters in future MCU projects is a certainty
Before Deadpool brings Hugh Jackman’s Wolverine to the MCU, Ant-Man and the Wasp will be busy in the Quantum Realm, Captain America will be busy fighting The Leader, and Blade will be busy facing vampires. The MCU’s only clear connection to mutants before Deadpool 3 is Kamala Khan, so The Marvels is likely to dive deeper into her mutation. And given that Kamala will be teaming up with Monica Rambeau and her idol Carol Danvers, there are a few mutant characters that also seem likely to show up in The Marvels.