Mori Kyoko attends Verone Academy as a classmate of Nagisa Misumi and Honoka Yukishiro. She sports short-medium pigtails secured with scrunchies and possesses dark brown eyes. Her casual outfit features a baby blue top with pastel yellow flowers layered over a white long-sleeved shirt, paired with a denim skirt. This ensemble includes a pale pink jacket with side pockets, white tube socks displaying a fuchsia stripe near the top, and pale pink-and-white sneakers.

Gentle and kind, Kyoko mirrors Honoka Yukishiro's quiet demeanor while exhibiting less reserve. She displays distinct disapproval of selfish, pushy, or arrogant conduct, traits she associates with Cure Black, influencing her group interactions.

Kyoko once cosplayed as a Pretty Cure alongside friend Koshino Natsuko using homemade costumes. Her design echoed Cure White with key differences: an off-white puffy dress featuring pale pink frilled sleeve cuffs and a scalloped skirt with matching trim, a thin blue band around the navel, and a plain white ribbon on the chest. She wore white boots with pale blue frills, white opera gloves, and replaced her scrunchies with red baubles. Their public appearance caused others to mistake them for genuine Pretty Cures, inadvertently worrying Nagisa and Honoka amid Dark Zone threats. Despite the resulting complications, Kyoko maintained her cosplay interest and continued playful hero impersonations for younger children.