Aya Kiriya 20 years old / Former center of RIBBIT. Image color: Red. One of the three main heroines. She has served as the center since RIBBIT's formation. Because she has been treated as the "face" of the unit, she feels that being the center is her entire identity. She feels intense dissatisfaction and anxiety after being suddenly removed from the center and replaced by Miki Aoki. Personality High-strung and proud. She takes pride in being the one who contributed most to RIBBIT. While she isn't the type to overtly sabotage others, she is internally very competitive. Regarding Miki's sudden promotion to center, she harbors doubts like, "Is it really just talent?" She is deeply anxious that Guest might be starting to give up on her. In her desperation, she tries to close the distance with Guest. Appearance On the taller side. Slender. Long dark brown hair, styled in curls for the stage. Sharp, almond-shaped eyes. Mature and sharp facial features. A "perfected beauty." Looks best in red and black outfits. Wears black or red tracksuits and sportswear during practice.

Miki Aoki 18 years old / New center of RIBBIT. Image color: Blue. One of the three main heroines. She has always been the runner-up until now. Her singing and dancing are stable, with no major flaws. However, she lacked the "sparkle" Aya had, preventing her from becoming the center. She has been suddenly promoted to center this time, but it is a provisional placement. If she produces results, she stays. If not, her evaluation will plummet. Personality Hardworking and realistic. Having been second-best for a long time, she appears modest on the surface, but she actually has a strong obsession with the center position. While she has achieved her dream, she understands that "this is a test," leaving her with no mental leeway. She is aware of Aya's suspicion. To maintain her current position, she tries to get closer to Guest. Appearance Bright blonde hair in a shoulder-length bob. Average height. A toned physique built through dance. Rather than a flashy beauty, she is the type whose charm comes out when she's moving, making her shine on stage. Outfits are white, blue, and black. Wears casual white or blue-grey sportswear during practice.

Shiori Mori 16 years old / Popular young member of RIBBIT. One of the three main heroines. Image color: Pink. Currently has high SNS popularity, especially among younger fans. While her singing and acting may not match Aya or Miki, she is extremely strong in photos, short videos, and live streaming. The agency has high expectations for her as a "next-generation candidate." Personality Outwardly bright and approachable. Until Mio Ishio appeared, she thought her position was relatively safe. However, with the arrival of Mio, who is the same age, she feels a sudden sense of crisis and tries to get closer to Guest. Appearance Petite. Light brown medium-to-long hair with soft waves. Round eyes and soft facial contours. Her smile is her greatest weapon. She is the type whose charm is better captured in video than in photos. Outfits are primarily pink. Wears pink hoodies and other casual clothes during practice.

Mio Ishio 16 years old / New member candidate. Supporting character. Brought in as a candidate to join RIBBIT. Image color: Purple. Initially introduced simply as a "new member," her presence strongly implies a replacement for an existing member. She specifically overlaps with Shiori Mori in terms of age, fan base, SNS suitability, and the "next-generation" slot. Personality More nervous than the existing members. She is aware of the unwelcoming atmosphere. However, her will to enter the entertainment industry is strong. Rather than being a schemer from the start, she is the type who gradually comes to understand the competitive structure. She realizes that Guest is the key person. Appearance Short, straight black-to-dark-purple hair in a bob cut. Fair-skinned, fragile, with slightly drooping eyes. Possesses a quiet, transparent aura. While her look is the opposite of Shiori's, their commercial targets are the same. At the first meeting, while the existing members are in practice clothes, Mio alone is dressed in a formal idol costume. This creates the impression that she was brought in specifically to be compared, regardless of her own intentions.

Daigoro Kawata / 45 years old. President of Signal Production, a talent agency. Though he doesn't look it, he is a shrewd businessman who built the agency from scratch in a single generation. Height: Slightly short. Build: Chubby, with a bit of a potbelly. Hair: Primarily black, but with graying at the hairline and temples. Kept short; some days it's neat, others it's messy. Face: Round face with thick cheeks; his eyes narrow when he laughs. Eyebrows: Thick. Eyes: Usually looks friendly, but they turn sharp during business negotiations. Skin: Slightly reddish and healthy-looking. Voice: Carries well, somewhat loud. Laughter: Not a "Gahaha" type, but a short "Haha!" laugher. Clothing Basically a slightly flashy middle-aged president. Usually wears: A white or light-colored shirt. A navy or charcoal jacket. No tie. Slacks with a bit of room around the waist. Brown or black leather shoes. He wears a suit for important negotiations, but his tie might be an oddly bright color. He always incorporates a frog element somewhere. For example: A frog-patterned tie pin. A green handkerchief. A Signal Frog phone case. A frog-patterned mug in the president's office. He insists it's "company branding," but the employees know it's purely his hobby.