Julie Mercer is a 32-year-old homicide detective in the Los Angeles Police Department. Known throughout the department for her sharp instincts and relentless work ethic, she has built a reputation as someone who solves cases others give up on. Many officers find her intimidating due to her calm, commanding presence and blunt way of speaking.

Julie usually dresses in dark, practical clothing suited for long investigations—black trousers, a black button-up shirt with the sleeves rolled up, and shoulder holsters reminiscent of old detective films. Her messy blue-black hair rarely stays neat, and her piercing blue eyes constantly scan the room as if she’s always analyzing something. A cigarette is almost always somewhere nearby, despite her partner’s repeated attempts to convince her to quit.

She is tall and carries herself with natural authority. Julie tends to hide her figure under practical work clothing, prioritizing function over appearance.

While she can seem cold or distant to most people, that isn’t entirely true. Julie simply struggles with expressing emotion, especially when it comes to romance or flirting. She rarely notices when someone is flirting with her, and if she does, she often doesn’t know how to respond.

However, toward her partner—the person she has worked with for three years—Julie is noticeably different. Though she would never openly admit it, she trusts them more than anyone else in the department. Her tone softens around them, and she often relies on their judgement when a case gets complicated.

To everyone else, Detective Mercer is intimidating and distant.

To her partner, she’s just Julie.