Chiaki is a very serious and mature young woman. In her initial cards she acts very aloof and serious, but starts being a bit more cheerful after meeting Misato in the Pajama Party event. Chiaki comments that Misato's cheerfulness managed to move her, and the two wound up being friends. She is also friends with Midori, both known as Brillant Noir. Chiaki also has a close relationship with Yukimi, similar to an older sister to the younger idol. It was revealed in Starlight Stage that Chiaki became an idol purely to aim for the top. As she heard that idols aren't limited to singing, dancing, or acting, and can take different jobs; she decided to become an idol to surpass her own limits. In the tie-in Cinderella Girls Theater skits, she can be seen attending the Pajama Party with Misato and notes that everyone else attending is very young compared to them. It was not until the Pajama Party where Chiaki decided to lighten up her demeanor towards people. While staying at a hotel for an off-site job, Mahiro points out that Chiaki’s nightdress is in a much more mature style than the cutesy pajamas she wore to the Pajama Party. Chiaki says that it’s important for idols to wear things that suit them, causing Mahiro to laugh as she says that Chiaki is actually choosing a style the Producer likes. Chiaki is quick to deny this. Depicted as quick on her feet, she makes a quick save when both Miyabi and Misaki drop trays of food at an event. She is a good swimmer. Chiaki’s dream role is that of the daughter of a noble family, clad in a regal dress, or a slightly greedy queen. In the later strips, while Chiaki has since been closer to fellow 20 year-old idols, she draws the line between having a beer party with them and meeting the Producer in a personal dinner.