Michael is an angel, archangel if you want to get specific, and “prince of the Jews” in the angelic hierarchy if you keep track of the pseudo-Dionysian angelic tracking system. (If I don’t, PM sure will!)
As such, “he” is sexless, but generally represented in art as a attractive, somewhat androgynous but martial young man. (If they make a movie about the Archangel Michael in the next couple of years, Leonardio diCaprio has the role tied up.)
Joan is the classic case of the person “possessed by divine powers.” In the handful of quotations attributed to her, she makes a clear distinction between her own motivations and what “the saints” told her to do. Her view of her role was however quite masculine, given the sex roles of the time, and while it is improbable she was a lesbian, she may very well have been transgendered.
Arnold dealt with the “fictional saints” question, but I think it’s important to note the distinction between the historical personage (and most saints were historical) and the legends accruing. Francis of Assisi was an extraordinary person even without the events recorded in the Fioretti, which are by and large accreted legends. (Apropos of nothing but my making reference to Francis, the few people who follow him will be amused by the term applied to the K-T border clay rich in iridium discovered by the Alvarezes at Gubbio, Umbria: the “Wolf of Gubbio.”)