Kavita Rao, Sofia Mantega, Stevie Hunter & Tom Corsi for Humans Aligned With Mutants
Adam X, Aurora, Bling, Cecilia Reyes, Empath, Fixx, Madison Jeffries, Nature Girl, Omega, Pestilence (Ichisumi), Sunfire, Trance, Vange Whedon, Warpath as missing mutants
Danger, whatever category she fits into.
Avalanche, Destiny, Mimic, Synch, among many others, who are dead mutants that could theoretically be back.