Chloe

Chloe is Elle Wittimer's step-sister, Calliope's twin sister, and Catherine's daughter.

Geekerella
Chloe is one of main antagonists of the book.

The Princess and the Fangirl
Chole is mentioned by Calliope and Sage. It is revealed that she has a lifetime ban on any convention and now works in her mother's beauty studio.