Aoi Shirase is a human reporter for a local newspaper. She shares a childhood history with Shutaro Kurusu, establishing a long-standing personal connection predating the series. Her personality exhibits energetic enthusiasm and a fearless approach to her reporting, driven by a specific fascination with vampires and the performing arts.

She actively investigates mysterious incidents like human combustion, though her editor sometimes rejects these pitches in favor of conventional assignments, such as covering the Imperial Hotel opening. Her physical appearance causes instances of mistaken identity, as she closely resembles Misaki, the actress performing Salome, leading to confusion for characters like Yoshinobu Maeda.

Her role includes becoming a target; she is captured specifically to lure out the vampire Defrott. Her relationship with Kurusu is a recurring element; she requests his promise to return alive and maintains a persistent belief in his survival even after receiving official notification of his death in action. This belief aligns with her noted tendency to avoid overt displays of grief, established earlier following her older brother's death.

Throughout the narrative, her core functions involve her work as a reporter pursuing vampire-related stories and her personal connection to Kurusu. Her background, motivations, and actions remain consistent with these aspects.