Kayo Yashiro manages the Ishikawa household and cares for Tooru Ishikawa. She presents a distinctive appearance with dark brown hair styled in a half ponytail secured by a red tie, featuring bangs swept to the left and chin-length strands framing her face. Her typical outfit consists of a white turtleneck sweater, dark-blue jeans, and a green apron. She stands 176 centimeters tall, still gradually increasing. Her personality combines warmth with occasional overinvolvement, often fussing over others to the point of overwhelming them. She exhibits a playful and teasing demeanor, particularly toward her close friend Tooru Ishikawa, engaging in lighthearted arguments. Upon first meeting Yuki Yoshikawa, she enthusiastically teases both Yuki and Tooru under the mistaken assumption Yuki is Tooru's girlfriend, establishing her as observant yet sometimes overly enthusiastic socially. Her relationships center on connections within the Ishikawa household and school social circle. She shares a comfortable rapport with Tooru Ishikawa, marked by mutual familiarity and occasional joking conflicts. Her bond with Yuki Yoshikawa develops positively after clearing up the initial misunderstanding about Yuki's relationship with Tooru. These interactions highlight her role as a supportive yet occasionally intrusive figure. Her characterization remains consistent as a dedicated caretaker with a sociable but meddlesome nature.