Madoka Kuki is a supporting character in When Supernatural Battles Became Commonplace. She is a student at Senko High School and the closest friend and classmate of Chifuyu Himeki, one of the five Literature Club members who gained supernatural powers. Madoka is a small, cute girl with short black hair that fades to blue at the ends, usually tied into a small ponytail at the back. Chifuyu affectionately refers to her as Cookie.

Madoka’s personality is defined by her caring and attentive nature, particularly toward Chifuyu. She is often seen looking after her friend by fixing her uniform, brushing her hair, and walking her to school. This nurturing behavior underscores her deep sense of responsibility and loyalty. Unlike the main group, Madoka does not possess any supernatural abilities; she remains an ordinary person amidst the extraordinary events. Her role in the story is primarily that of a supportive friend who grounds Chifuyu and provides a glimpse of normal daily life outside the battles and club activities.

Madoka’s key relationship is with Chifuyu, whom she cares for deeply and tries to keep in check. She interacts occasionally with other club members as Chifuyu's companion, but her focus remains on her friend’s well-being. Her motivation stems from a genuine affection for Chifuyu and a desire to maintain a sense of routine and normalcy. Madoka does not undergo significant personal development over the course of the series, as she remains a consistent, stabilizing presence. Her notable abilities are limited to her interpersonal skills and her unwavering dedication to friendship, rather than any supernatural power.