The teen goth has been a valuable staple of the teen drama (or comedy) for decades. Sometimes, they're just part of one of the many background cliques. A familiar face in the halls to give viewers a sense of recognition: "Hey, they look just like that one group of fingerless lace glove lovers who went to my school!"
Sometimes, they're filling the all-important role of the rebel. The kids who don't care if denim miniskirts and blonde highlights are in. The goths wear the kind of clothes that speak to their aesthetic.