As prostitute depowered, repowered dead characters go, there's pretty much Stacy-X. Created by Joe Casey and Tom Raney in Uncanny X-Men, then moving to New Warriors, she met her untimely demise in New Warriors #17 in an accident.
But, according to yesterday's X-Men panel at Wondercon, she'll be back, along with three other unidentified characters, in something called Vengeance
UPDATE: Holocaust was another. The others are described as a flag wearing character and a small man in a black and white suit,