Who is Jai,Kai, Lai from Extras and what is their importance?

Jai is the name of the Sly Girls' leader. She changes her name several times during the course of the novel to keep her face rank from rising. Jai dislikes Aya and believes she wants to kick a story on the Sly Girls. The Sly Girls avoid publicity because they worry that if their stunts became public, others would try to do them and the wardens would try to stop them. For this reason, Jai and the others do not want Aya to be a part of their group, but because of their concern about the cylinders and mass driver, allow Aya to kick the story.