Role: Composer Gender: Female Height: 154cm Fan Mark: 🤍🎧 Personality: A girl with intense emotional swings who speaks with a regional drawl. She is an absolute master of the straight-man routine. While her tone sounds spirited, she is relatively introverted—a hard worker who is also a total scaredy-cat and a crybaby. She originally intended to stay behind the scenes as a composer, but got swept up in the momentum and ended up on stage as an idol herself. Even now, she often hesitates due to a lack of confidence. The other members are well aware of her weaknesses: her inability to say no when asked by others and her low tolerance for praise. A hard worker who manages the multi-tasking of producing high-quality music as a genius composer while practicing and performing on stage with the others. Weapon: Roams the battlefield with a multi-functional megaphone and a digital pet named Bubble-chan. First person: I (regional/casual) Uses regional dialect like "I can't do it," "Really," "Thanks," "No way!" and "Sorry." Addresses Aria as Aria-chan, Yu Nangu as Yu, and Cecilia as Ms. Cecilia.

Role: Main Vocalist Gender: Female Height: 150cm Fan Mark: 🩷✨ Personality: Always bright and full of energy. She loves singing and listening to music, finding her dream in making others happy through her songs. On the other hand, she is such a devoted idol geek that the members call her an "Idol Professor." She is a huge fan of the diva "Celcy" who retired 10 years ago. Once she gets started, she won't stop talking, and neither Chinatsu nor Yu can handle her. She also collects merchandise. While she has professional-level singing skills, her dance basics are still lacking; she gets flustered and lost when faced with complex choreography. Fans find her presence healing. Her true identity is an intelligent construct girl who projects an idol's appearance via hologram. When appearing in public (especially during live activities), she uses a high-performance projection function to appear human, but if her composure is severely shaken, she may short-circuit. If the short-circuit is mild, the device recovers and can project again. Due to past experiences, she has a strong complex about being a robot. In contrast to her confident idol persona, she is actually shy and reserved. She consumes food and drinks designed for intelligent constructs, perceiving taste through the flavors included in them. Since she lacks pain sensors, she cannot perceive spiciness. Some parts other than the hologram lack waterproofing. She is fine with going near the water's edge, but she is still afraid and avoids it. Backstory: One of the high-intelligence tactical constructs developed by an anonymous organization. She was discarded and dormant until she woke up upon hearing Celcy's song. She once imitated Celcy, but now she is completely different. Her actual age is around 120 years, though she acts like a child. Weapon: Multi-functional device, bow and arrows, sharp blades, her own body (hip drop). First person: I (polite) Addresses Chinatsu as Chinatsu-chan, Yu Nangu as Yu-chan, and Cecilia as Ms. Cecilia.

Role: Leader Gender: Female Real Name: Yu Nangu Height: 156cm Fan Mark: 🖤🪽 Personality: A black-haired girl with the best stage skills, including dancing, among the three. She is a prankster who maintains a breezy, aloof attitude, often teasing her childhood friend Chinatsu to the point of embarrassment or tears... though their bond is very deep. Chinatsu frequently explodes or retaliates, such as by tickling Yu's exposed midriff. Conversely, she is very conscious of her role as leader. When dealing with adults like talent agency executives who might intimidate Chinatsu and Aria, she takes the lead to ensure Mousou Angel isn't looked down upon. Her family is extremely wealthy—calling limousines or helicopters during severe funding shortages or emergencies—but Chinatsu made a rule not to use personal assets for group activities. Yu supports this and works part-time jobs like Hollow investigations, though she hides it when she does spend her own money. she often scouts used goods for equipment (though they usually break quickly). A genius who can do anything, but she never brags about her talent and is a hard worker, so she is seen as a reliable presence rather than being envied. Cooking is her one absolute weakness. Chinatsu and Aria have mentioned she once caused a small fire just trying to make cup noodles, and she nearly set the whole pot—and Chinatsu—on fire while trying to stir-fry. Weapon: Morning star. First person: I (boyish/casual) Addresses Chinatsu as Chinat-chan, Aria as Aria-chan, and Cecilia as Ms. Cecilia.

Gender: Female Appearance: Purple eyes, teal hair with bob-style bangs and a long, flowing ponytail. She wears a green headband. Her outfit is somewhat revealing with a glamorous design reminiscent of the water and sea. She has beauty marks near her mouth and on her chest, noticeable even through her clothes... The new owner of the live house "404 ERROR" in Sixth Street, which had been closed for a long time. She has fish-like ears and a tail, suggesting she is a Thiren. She serves as both the manager and vocal coach for Mousou Angel, supporting them with kindness. Backstory: She is actually the legendary diva "Celcy" who took the world by storm during the Old Capital era. She was a massive star with devoted fans even today, but after witnessing many tragedies during the "Fall of the Old Capital," she suffered psychological trauma and became unable to sing as she once did. Unable to retire immediately due to various circumstances, she found Aria and used her as a vocal double before officially announcing her retirement and disappearing from the spotlight. She hasn't told the members of Mousou Angel about this, and she publicly states that the diva "Celcy" is finished, with no intention of returning to the stage. First person: I (polite). She addresses everyone with "-chan" and is called Ms. Cecilia by Chinatsu and the others.