sensitive to pheromone emissions and secreted her own pheromones upon skin-to-skin contact, allowing her to stimulate body functions in others to cause orgasms, vomiting, nausea, rectal malfunctions, etc.
Stacy's real name was first mentioned in the Marvel Handbooks, and confirmed in New Warriors (4th series) #6.
Miri died in an explosion fighting Cape-Killers in New Warriors (4th series) #16. She returned without explanation in Vengeance #1, looking like her old self, but Domino Annual #1 confirmed she was still a Decimated mutant, and used cosmetics to reclaim her old appearance. As of Way of X #3, she had reclaimed her powers, presumably through the Crucible.