Current PC is already female. The concept itself is genderless so he would just keep acting exactly the same as he always did: punch and kick things until they stopped moving.
My last PC would start whoring herself out to devils for more power. Now instead of breeding strong genes into as many women as he could, she would become highly selective of who she wants to spawn offspring with. I was very disappointed when i found out female Abishai couldnt produce offspring but males were more than capable.