What I find interesting about this show is its ability to take stereotypical, archetypal characters and turn them on their heads. For instance, we got the normal and overly cheerful nice girl with Rachel, but she is also seen as manipulative and self-absorbed. This is especially evident when she says that she wants to allow another couple win the duet competition, because she is helping other people feel like they have accomplished something while only looking for her own benefit in the long run.
Rachel is not the only example of such characterization; The McKinley High cheerleaders have also been altered from their typical forms. Brittany and Santana are shown to be the most popular of their school. However, their relationship is what sets them apart from the typical cheerleader. Showing the two girls acting on lesbian impulses provides enough character development to increase the diversity of the already wide-ranging show.
The biggest distinction of the show comes from Kurt and his embodiment of what a typical homosexual character can be described as, and his ability to stereotype others. He is quick to assume that another character, Sam, is gay based on how his hair looked; At the same time he can call another one homophobic for telling him that he is overstepping his boundaries. The whole situation with Kurt is interesting because it is a typical scenario of a fictional work: A guy likes someone, uses a scheme to get close to that person, and in turn tries to get that person to like them. The only difference is that this time the situation is based on a homosexual interest that can cause many problems when sexual preferences are taken into question and consideration.