The Hulk was the first target of the newly-formed Avengers. They discovered his other identity as Bruce Banner and prevailed upon Doctor Fate to put matters to rights. Dr. Bruce Banner is now a foremost researcher in the effects of radiation on human tissue. There has never been a She-Hulk as such. However, there have been many others irradiated with gamma rays after the effect on Banner became known, and other man-monsters (and woman-monsters) have appeared over the years. None have had the sheer power of the original Hulk, however.