...I was just saying the same to a friend, and wondering if I should reply this here. XD There are 33 episodes other than FYG, and Five Years Gone is an alternative future that will not happen anymore, so basing your characterization entirely on this AU wouldn't be the best of ideas.

"Bad-ass" is not the first word that comes to mind when I think of Peter, but I agree with the OP that Peter doesn't really act like the stereotypical girl, either. both terms are annoying extremes, and characterization is usually more complicated than that...