I just went to see the Rocky Horror Show with Gretel as the Narrator. At first it seemed weird with a female narrator, after seeing the movie so many times with the old man, but by the end I couldn't imagine this particular production with a male in the role (all the other performers of the role in this production have been male). She seemed to fit the role so well-- think BB06's Adults Only, that kind of school meadmistress persona. At first her lines seemed rushed, but it was in line with the rest of the show that was very fast paced.
Her costume was a tight skirt, button up blouse, high belt, glasses and a beehive wig. The wig was funny because when she moved around the stage it bounced up and down. For the finale, she took off the grey top and had a strapless sparkly red number underneath.
Although she is the narrator she does have a few scenes where she interacts with the cast, and a couple of little dance cues. And at the end she sings and dances to the Time Warp with the rest of the cast.
She did a great job in the role and I'm glad I was lucky enough to see her in it, especially when I thought her run in the show was over back when it was in Sydney.