I'm working on something now that starts off with an obvious protagonist. Really, he's the one that the plot follows. Then he meets someone who seems to take just as active a role as he does in the main goal. Interestingly enough, but not at all surprising, it is a she. I did originally have this story in first person with him being the main character. Things were more clear cut then but now I have an entirely third person story with two characters sharing the protagonist position. Do I treat them equally or focus on the one that was first introduced? What would be the pros and cons of each?