Kiyone is the younger sister of Isane Kotetsu, the Lieutenant of the Fourth Division. Unlike her sister, Kiyone is very open and excitable but she does share Isane's sense of loyalty. She holds her captain, Jūshirō Ukitake in high regard and always tries to impress him in any way possible, even if she has to ruin her partner Sentarō Kotsubaki to do so. Kiyone's infatuation with her Captain is often a source of comic relief, as she frequently engages in competition with Sentaro over who admires and/or loves him more, much to Ukitake's exasperation.