In the second draft of the Star Wars script, the character Luke Skywalker was changed into a woman. From the book Making Star Wars:

Lucas made a significant alteration to the second draft during the last couple of days in March 1975: He changed Luke into a girl. “The original treatment was about a princess and an old man,” Lucas explains, “and then I wrote her out for a while, and the second draft didn’t really have any girls in it at all. I was very disturbed about that. I didn’t want to make a movie without any women in it. So I struggled with that, and at one point Luke was a girl. I just changed the main character from a guy to a girl.”