Madoka Higuchi is a 17-year-old Tokyo high school student known for her cool, cynical demeanor. She possesses distinctive pink eyes, shoulder-length brown hair, a mole beneath her left eye, and stands 159 cm tall. Initially disinterested in idol fame, she nonetheless practices diligently in secret while publicly minimizing her efforts. Her decision to join 283 Production stemmed purely from a protective instinct toward childhood friend Toru Asakura, fearing exploitation; she joined under false pretenses. This protectiveness extends to her unit, noctchill, especially toward Koito Fukumaru. Madoka carefully chooses her words around Koito to avoid hurt and often feeds her snacks. Conversely, she interacts bluntly with Hinana Ichikawa, frequently acting as the straight man to counter Hinana's unrealistic notions. Despite formally calling Toru "Asakura," their bond is deep, rooted in a long history as neighbors with closely connected families.

Though timid as a child, Madoka now presents a reserved, realistic front. This realism initially led her to underestimate the idol industry's harshness. Participation in events like the Wonder Idol Nova Grand Prix (WING) exposed the competitive reality where one idol's success often means another's failure, forcing her to confront the emotional struggles involved. Professional experiences, like filming in a dilapidated museum or giving an interview in a café filled with dried flowers, prompted reflections on the transient nature of beauty intertwined with culture and history. These experiences shaped her aspiration to refine her own aesthetic sensibility through idol work.

Madoka's journey involves confronting personal fears, like her intense aversion to insects, which disrupts her composure. She reconciles her innate talent with the industry's demands, recognizing popularity requires more than natural ability. Her performance approach evolved from demanding perfection to the point of physical strain toward embracing a more nuanced understanding of expression. Interactions within noctchill highlight her loyalty and direct communication, balancing protectiveness with honesty. Her arc shifts from a reluctant participant focused solely on safeguarding Toru to an idol actively seeking her own artistic identity, while maintaining a guarded yet deeply committed stance toward friendships and career.

Official media depicts her feeding Koito a chicken donut, playing with a large teddy bear alongside Koito, or running in a wedding dress during unit activities with Toru dressed as a groom holding her veil. These moments emphasize her integration into group dynamics despite her outwardly aloof personality. Her cynical exterior masks deep consideration, evident in measured words around Koito and emerging artistic curiosity during quieter reflections. The contrast between her initial misconceptions about idol work and her later dedication underscores her personal and professional maturation within the industry's complexities.