Holley is happy, serious and focused in her missions. But also shown to be a Strong -Willed, Brave and Independent
Holley is a young British desk agent turned spy-in-training who is stationed in Tokyo. Well-educated and sharp, she knows every trick in the book (or rather, she relies on every trick in the spy manual). She is armed with all of the latest state-of-the-art spy equipment imaginable, from hidden cameras and concealed weapons to a telescoping utility arm and a holographic pop-up display. Holley is a highly motivated agent, but is fresh out of the academy, so her experience is based on lessons learned in school rather than real-life situations. When Finn McMissile requires Holley's technical expertise for his latest top-secret field operation, she finds herself pursuing a rendezvous with the most unlikely candidate—Mater, an innocent tow truck caught up in the intrigue, who is mesmerized by the beauty of his newest friend.
At the end at the movie, she says she is Mater's girlfriend and says to Mater that he still owes her a first date.
Some Lego Cars 2 sets include Holley. However, that version of her is a little bit more pinkish (in the film and other media however, Holley is purple).
Her license plate is HS1201, which includes her initials. The number 1201 is Emily Mortimer's birthday (December 1).