Feral, Maria Callasantos, first appeared in New Mutants #99 (January 8, 1991).
Feral by power, nature, name. The ailuranthropic (Were-Cat) or cat/human hybrid mutant Feral was a ticking timebomb of rage, always ready to fight. Maria Callasantos’ life was dredged in mystery, deceit, and death. She has a sister, Thornn whom was once a member of the X-Corporation and has a similar mutation.