Jillian Robinson is the curator at the New York Museum of Archaeology. Her primary role in the story is as the immediate supervisor to the film's human protagonist, Elena Wallace. Jillian is depicted as a manager who is skilled at delegating tasks to her subordinates and subsequently taking credit for their successful work.

In her professional capacity, Jillian's main motivation appears to be personal and professional advancement. She is keen to have her work featured in prominent publications, such as the magazine Minerva, which she believes will elevate her own status in the academic community. Her character is defined by a preoccupation with appearances and social functions. On the night the central events of the story unfold, she is more focused on preparing for and attending a fundraiser, taking time to show off her dress, than on the important artifacts in the museum's collection.

Jillian's key relationship is with her intern, Elena Wallace. Their dynamic illustrates a clear power imbalance. While Elena possesses deep, genuine knowledge and a sharp analytical mind, Jillian treats her as an errand-runner, sending her to get coffee and dry cleaning. When police arrive with a collection of seized artifacts needing authentication, Jillian repeatedly pages a late-returning Elena, who is then able to appraise the items accurately. Jillian subsequently reports this information to the officers as her own conclusion, taking full credit for the work.

Later, when Elena attempts to share her theory that a newly arrived falcon statue is more significant and mysterious than it appears, Jillian dismisses her intern's insights without consideration, handing Elena more clothes for dry cleaning before leaving for a fundraiser. In her carelessness, she tosses Elena her clothes, which include her museum ID. This ID inadvertently provides Elena with the access she needs to re-enter the museum laboratory that night, setting the larger plot in motion. Throughout these interactions, Jillian remains oblivious to the artifact's true nature and the global-scale conflict about to unfold, serving as a contrast to Elena's curiosity and determination. She does not undergo any significant character development within the film and has no notable abilities related to archaeology or combat, as her skills are exclusively administrative and self-promotional.