The primary female character in the Pokémon Detective Pikachu film is Lucy Stevens. She is an ambitious junior journalist and reporter working a menial position as a fluff columnist at the CMN television headquarters in Ryme City. Accompanied by her partner Pokémon, a Psyduck, Lucy is portrayed as a young woman with light skin, green eyes, and blonde hair typically styled in a ponytail with bangs.

Lucy possesses a feisty and investigative personality, driven by a strong desire to prove herself as a serious journalist despite her youth and lack of experience. This ambition sometimes leads her to pursue stories based on rumors rather than credible sources, and her attempts to appear professional can seem forced. Despite these shortcomings, she demonstrates a caring nature, showing concern for Detective Pikachu when he is injured and attempting to comfort his partner, Tim Goodman, in difficult moments.

Suspicious of the official report that veteran detective Harry Goodman died in a car crash, Lucy and her Psyduck stake out his apartment, where she encounters Harry’s estranged son, Tim. Although Tim initially dismisses her theories that the accident was arranged by a powerful figure named Roger Clifford, he and Detective Pikachu later seek her assistance. Together, the group infiltrates the PCL research facility, where they uncover experiments involving the legendary Pokémon Mewtwo.

Throughout the story, Lucy serves as a valuable ally, using her media knowledge to help the protagonists. After they are chased from the laboratory, she and Psyduck stay behind while Tim and Detective Pikachu venture further, and she later regroups with Tim in the city. When the villainous plot unfolds and a gas forces people to fuse with their Pokémon, Lucy herself is affected and becomes one with her Psyduck. Following the resolution, where Mewtwo reverses the transformations, Lucy’s investigative theories are proven correct. As a result, the real Roger Clifford hires her as a genuine reporter, assigning her first major story to cover the full extent of the conspiracy. A romantic subplot is also implied, with hints of a mutual attraction developing between Lucy and Tim as the adventure concludes.

While Lucy has no special supernatural abilities, she demonstrates determination, growing from a dismissed and inexperienced blogger into a respected journalist through her direct involvement in solving the central mystery. Her key relationships include her loyal but often headache-inducing Psyduck, her romantic interest Tim Goodman, and the talking Detective Pikachu.