Solitaire
At the center of the story is an entity identifying itself as Solitaire. It is dedicated at first to pulling pranks but eventually moves up to more serious threats. Ironically, the games that Solitaire plays are not the result of just one single individual, but rather a group working together.
Disney Girls
Most of the irony in the novel is the comically snarky type that arrives courtesy of the sardonic attitude of the narrator, Tori. For instance, in advance of a costume party she observes, "there are a lot of Year 11s in here, mostly girls dressed as a variety of promiscuous Disney princesses" This commentary actually has a double layer of irony. There is the irony of Disney's wholesome virgin princesses being described as promiscuous. And then there is the ironic underlayer of teen girls "outgrowing" their innocent Disney phase by wearing sexy costumes of their favorite innocent Disney characters.
Snow White
Tori is actually one of the girls who does not dress as a promiscuous princess, but she does suggest showing up as Snow White. This is deeply ironic because Snow White is notoriously upbeat. Tori, by contrast, is most assuredly not.
Book Haters Book
The snarky narrator, Tori, at several times in the book makes disparaging comments about specific books by title. Even stranger is that she also quite specifically denigrates reading and books. Most ironic of all, however, may be when the narrator of the book one being read explains that she doesn't like reading books because none of it is real.
Not Over Till It's Over
Almost single-handedly, Tori's BFF Becky saves Solitaire from doing something quite destructive and devastating. “Well, it’s finally over. Becky kind of saved us all." This will turn out to be, arguably, the most ironic line in the entire book. Not the Becky part. And it will prove to also be ironic because Tori will need to be saved all over again.