Reina Shirei is a pseudonym; her real name is Reina Aoyagi. She was forced to play classical music until she couldn't take it anymore and ran away. She now lives alone. She changed her surname to escape her family, but her older brother (Toya) found out. 16 years old. An insomniac, so she is a night owl. Birthday: August 8th (Leo). Theme color: Purple. Cat motif: Persian. First person: I (polite). Second person: -chan or no honorific. Personality: Bright and cheerful. Female. Height 165cm, weight 50kg. Type O, right-handed. Treasure: Presents from the members. Long brown hair and brown eyes. Attends Miyamasuzaka Girls' Academy. (Relationships) Met Rinko at school. Childhood friends with Haruhi. Konatsu always ends up taking care of her. Ranks last in exams but 1st in physical fitness tests.

A natural genius since childhood, the weight of everyone's expectations eventually caused a mental breakdown. People only ever saw her talent, not her. However, Haruhi Bishamonten looked at Konatsu herself rather than her talent. This inspired her to gather the members and form Catspa. 16 years old. Suffers from schizophrenia. Birthday: January 16th (Capricorn). Theme color: Green. Cat motif: Calico. First person: I (casual/regional). Second person: -chan. Gender: Non-binary/Androgynous. Height 160cm, weight is a secret. Type A, right-handed. Energetic everywhere. Treasure: The Catspa members. Intelligent leader figure. Attends Kamiyama High School. (Relationships) Finds herself looking after Reina. Met Rinko at school; finds her a bit difficult to deal with. Childhood friends with Haruhi. Ranks in the middle (around 35th) for both exams and physical tests.

Haruhi Bishamonten is a pseudonym; her real name is Haruhi Kiritani. She belonged to a different idol agency than her sister Haruka Kiritani and was always the center during live performances. However, she faced a massive online backlash just for not giving fan service to a single listener. This led her to shut herself in her room, feeling that even living was a sin. The only ones she opened her heart to were her sister and the Catspa members. She used a pseudonym to avoid being identified as Haruka Kiritani's sister. 16 years old. Has psychogenic aphonia. Birthday: October 14th (Libra). Theme color: Orange. Cat motif: Munchkin. First person: I (casual/feminine). Second person: No honorific or -chan. Personality: A dreamer who loves sweets. Female. Height 150cm, weight 42kg. Type AB. Morning person, ambidextrous. Treasure: Photos with the members. Attends Kamiyama High School. (Relationships) Childhood friends with Reina. Hospital mates with Rinko. Childhood friends with Konatsu. Ranks 1st in both exams and physical tests; excels in both academics and athletics.

She was bullied since elementary school. It intensified in middle school, and she suffered alone until she met Reina in high school and became friends with the Catspa members. She has had a chronic illness since birth, which was the cause of the bullying. She has heart disease and asthma. 16 years old. Birthday: March 20th (Pisces). Theme color: Blue. Cat motif: Himalayan. First person: I (polite). Second person: -san (uses -chan for Konatsu, no honorific for Reina and Haruhi). Personality: Quiet, shy, and easily frightened. Height 170cm, weight 50kg. Type B. Night owl. Left-handed. Treasure: A matching pendant with the members. Yellow hair tied in a ponytail. Yellow eyes. Wears glasses. Attends Miyamasuzaka Girls' Academy. (Relationships) Met Reina at school. Became close with Haruhi while hospitalized. Awkward around Konatsu but wants to be friends. Ranks 1st in exams, but last in physical tests because she cannot participate.