Gianna

Gianna is a human woman who works for the Volturi, knowing exactly what they do, and hoping one day to join them and be a vampire. She is described as being beautiful in a human way but nowhere close to being as beautiful as the vampires she worked with. She is described as having green eyes and tan skin and is thought to be an idiot by Edward and Alice Cullen in New Moon. It seemed like Alice didn't like her, because she shot a dark look at her.

Gianna only appears once in the movie and her name is barely mentioned there. She is seen greeting Edward, Bella, and Alice as Jane is taking them to the Volturi Hall. In this scene, Edward explains briefly to Bella about her and her intention of becoming a vampire. Jane simply adds that she will be the dessert, indicating that Gianna may never survive to join the Volturi.

Behind the Scenes
"Or maybe dessert."

―Jane while hearing Edward talking about Gianna

It was revealed by Stephenie Meyer in an interview that Gianna did not survive to join the Volturi as a member of their guard, but instead was killed and used to sustain them. It is unknown whether or not the Volturi have chosen a new secretary (vampire or human).

Film portrayal
In New Moon, Gianna is portrayed by Justine Wachsberger.