Ajimi Kiki is a prominent character introduced in the second season of the anime, making her first appearance in episode sixty-four. She presents the appearance of a youthful human female, though at twenty-two years old, she is notably the oldest main character in the series. Her most distinctive physical traits are her light pink hair, which is styled into low braided pigtails secured with pink and white dotted bows, and her amber eyes. A consistent and defining feature is her pair of half-rimmed pink glasses, making her the only idol who wears them during PriPara activities. She is among the shortest characters and her design often incorporates art-themed dresses that reflect her creative passions, a contrast to flashbacks of her preteen years where she sported a high ponytail and fruit-themed outfits without glasses.

Her personality is characterized by extremely high energy and eccentricity, often described as operating at a scattered, nonstop pace. This erratic behavior is tied to artistic stereotypes; she frequently drops everything she is doing the moment inspiration strikes, frantically running around to paint or make creative discoveries. Despite this overwhelming intensity, she maintains a universally friendly demeanor. A unique and memorable verbal tic is her habit of ending sentences with Da Vinci as an homage to Leonardo da Vinci. Her passion for art is the driving force behind nearly everything she does, and she sees the world through a distinctly creative lens.

Ajimi serves in dual professional roles. Outside of the idol world, she works as an art teacher at Paprika Private Academy. As an idol, she performs as a pop-type idol and is affiliated with the brand Candy Alamode More, a spin-off of an existing brand. She is a member of the musical unit UCCHARI BIG-BANGS alongside Cosmo Hojo and Chanko Nabeshima. She also becomes a member of the PriPara Police, a special unit formed to catch the Thieving Genius, working alongside characters like Laala Manaka. Her manager within the PriPara system is a hamster mascot named Ham, who was revealed to be a high-profile and well-respected mascot.

Her past is deeply connected to several key characters. She shares a long history with Hibiki Shikyoin, having known her since their childhood days in PriParis. Ajimi's persistent and hyperactive attempts to befriend Hibiki were so overwhelming that they caused Hibiki significant distress, ultimately leading Hibiki to flee PriParis and alter her appearance entirely. As a result, Hibiki initially avoids her and even in the present, while some tolerance has developed, there is still a notable discomfort between them. In contrast, her relationship with Cosmo Hojo is one of rivalry and friendship, originating from their time studying together at a foreign art academy. Her backstory reveals that her energetic nature was present even at age twelve, and her name etymology ties into the series themes, with Ajimi relating to taste and Kiki incorporating the color yellow.

In terms of her role in the story, Ajimi is introduced when Meganii creates the PriPara Police department. She immediately makes an impression by frantically painting graffiti throughout PriPara before solving a puzzle that was actually a test for recruitment, earning her a position as a sheriff. Her abilities are closely tied to her artistic talent. She is ambidextrous and a skilled designer, often using her art to express her thoughts and solve problems. Throughout the series, her journey involves balancing her duties as a teacher, her career as an idol, and navigating the complex social dynamics of her past, particularly her ongoing path toward reconciliation with Hibiki.