Chisato Shirasagi, nicknamed "Chi-chan," transitions from a second-year student at Hanasakigawa Girls' Academy to a freshman in Yotsuba Women's University's Faculty of Humanities. Her early exposure to the entertainment industry as a child actress cultivated a reserved and pragmatic personality, contrasting with her bandmates' idealism. This background heightens her appreciation for authentic friendships and private interactions, especially with Matsubara Kanon and Seta Kaoru.

Initially joining Pastel*Palettes as an inexperienced bassist diverged from her original career path, driven by commitment to the band's goal of redefining idol perceptions. Though typically polite and amicable, she occasionally displays direct or coolly critical reactions, particularly when agitated by Kaoru's theatrical tendencies—historarily teasing her with the childhood nickname "Kao-chan."

Her perspective evolves from viewing band activities as professional obligations to finding personal inspiration through bandmate Aya Maruyama's dedication, motivating her own dream-seeking. As she enters university, she grows simultaneously as an actress and idol, embracing challenges that broaden her outlook.

Standing at 152 cm, Chisato is Pastel*Palettes' shortest member. She frequents cafés for tea sessions and enjoys shopping, while disliking natto and expressing strong aversions to arthropods and amphibians. She struggles with train transfers and drawing, and her younger sibling often borrows her clothes without permission. She owns a golden retriever named Leon.

Her design features blonde hair, purple eyes, and a signature color of #ffefaa. An Aries born April 6, she favors black tea, acai bowls, and refreshing flavors.