Nurse Joy is a character who appears throughout Pokémon Chronicles as part of the larger Joy family, an extended network of identical-looking Pokémon nurses who operate Pokémon Centers across the world. Because every Joy shares the same appearance, the family name, and a similar gentle manner, most people initially assume they are all the same person; only a few characters, such as Brock, can tell them apart through small differences. In the Chronicles episodes, Nurse Joy is shown both as an established professional and as a young woman finding her calling.

In terms of background, the episode Celebi and Joy! traces her origins before she becomes a nurse. During a festival, she meets Nick, a boy who is accompanied by a Celebi. When Celebi appears to protect Nick, Joy is deeply moved by the act of loyalty and care, and she decides on the spot to dedicate her life to nursing, choosing to stay at the local Pokémon Center. In the episode Cerulean Blues, a different Nurse Joy appears in a more traditional and advanced stage of her career, working not only as a nurse but as a Pokémon Inspection Agent for the Pokémon League. She inspects the Cerulean Gym, confirms that it has passed her evaluation, and then departs for the Hoenn region.

Personality-wise, Nurse Joy is consistently shown as kind, earnest, honest, patient, and giving. She genuinely loves Pokémon and is devoted to the care of the sick and injured, providing treatment at any moment with a calm and reassuring manner. At the same time, she is a firm professional who will confront trainers directly if they are not treating their Pokémon properly, and she handles emergency situations with competence and determination. Even in her younger years, she is compassionate and easily touched by gestures of kindness, which is what draws her to the nursing profession in the first place.

Her central motivation is the well-being of Pokémon. Whether she is running a Pokémon Center, treating injured partners, or inspecting a gym, her actions are guided by a desire to ensure that Pokémon are properly cared for and that trainers meet responsible standards. This motivation shapes both of her Chronicles appearances: in Celebi and Joy!, it leads her to change her life's path, and in Cerulean Blues, it drives her to perform her official duties with seriousness and integrity.

In the story of Pokémon Chronicles, Nurse Joy serves in supporting roles that nonetheless carry real weight. In Cerulean Blues, she acts as an official judge of a gym's quality, and her approval formally legitimizes the Cerulean Gym; before leaving for Hoenn, Misty also asks her to deliver a message to Ash, telling him that Misty is now a real Gym Leader. In Celebi and Joy!, she is central to the emotional resolution of the episode, choosing to become a caregiver after witnessing a Pokémon protect its human friend.

Her key relationships include her partnerships with her Pokémon assistants, especially Chansey, which helps her heal other Pokémon, and in Celebi and Joy! she is also shown with a Ponyta that Richie borrows to go looking for Nick. More broadly, she is connected to every other Nurse Joy through blood, as the Joys are all sisters, cousins, and daughters within one large family that follows the same vocation.

Her development across the Chronicles episodes moves in two directions: one episode shows her transformation from an ordinary young woman into a devoted nurse, while the other presents her as a mature and trusted professional whose skills have earned her a position of authority within the Pokémon League. Her notable abilities include her medical expertise in treating sick and injured Pokémon, her calm effectiveness under pressure, and her capacity to serve as an official Pokémon League inspection agent, a role that requires sound judgment and a thorough knowledge of the standards that gyms must meet.