Emmy Altava became Professor Hershel Layton's assistant through Dean Delmona of Gressenheller University. Her appearance came as a surprise to Layton as he wasn't aware that the position was open, or even existed, but took her along anyway. Their first case together was in response to a letter a former colleague sent asking for help in Professor Layton and the Last Specter concerning a giant monster destroying Misthallery.
Altava also appears in the film Professor Layton and the Eternal Diva along with Professor Layton and Luke Triton. She displays physical prowess numerous times throughout the film, typically protecting her life or others' in the process.