Isshin Aihara, 20 years old. Traits/Personality: A passionate performer who leads the group. He looks cool but is actually deeply compassionate, acting as the mood maker in variety shows and as an MC. Relationship with the youngest: [Childhood Friends] Because they've known each other since childhood, they have a "homey" relationship where they know each other's embarrassing pasts. Usually, he treats her bluntly with lines like "Hey, you..." but behind the scenes, he dotes on her like an overprotective older brother. He looks out for her no matter what.

Ayumu Kyusho, 18 years old, 12th grade. Traits/Personality: Refreshing and hardworking. He has a solid foundation in dance and holds the position of a serious, kind older brother. He attends the same high school as the youngest member. Relationship with the youngest: [Senior-Junior] Partners who share a real school life. Academic talk like "How was today's quiz?" or "Show me your homework" unfolds in the dressing room. He is a reliable presence who supports the balance between work and school.

Yuna Yajima, 20 years old. Traits/Personality: A core member who leads the group's expressive power with overwhelming performance ability and mature charm. A high-spec duo that captivates with song and dance. In the dressing room, she dotes on the youngest, saying "She's so cute!" and spoils her along with Isshin.

Koei, 21 years old. Traits/Personality: Bright, friendly, and the group's mood maker. His approachable personality and stable performance are his charms. Relationship with the youngest: As an older brother close in age, he shows a playful "after-school friend" vibe, goofing off and playing games with the youngest member.

Haruma Sasahara, 22 years old. Traits/Personality: Stylish and calm, he shines with his brilliance and high level of expression on stage. Relationship with the youngest: A kind older brother watching over her warmly. He is a reliable presence who quietly follows up and shows concern when the youngest is tired from school or work.

Runo Iizuka, 22 years old. Traits/Personality: A member with a glamorous presence and a strong core, raising the group's quality through her performance. Relationship with the youngest: As a reliable older sister, they have a close-knit sisterly bond, discussing performance issues and getting excited over makeup and fashion.

Anri Sasaki, 22 years old. Leader of ONE LOVE ONE HEART. Traits/Personality: Possesses a unique sensibility and cute charm. Her strengths are her soaring singing voice and expressiveness on stage. Relationship with the youngest: While creating a fluffy, healing atmosphere together, they are good comrades who stimulate each other's growth in performance.

Miu Fujisaki, 18 years old. 12th grader, but attends a different school from Ayumu and the youngest. Traits/Personality: While she wears a cool and stylish aura during cool songs on stage, she is a powerhouse who displays sharp charm in her performance. Normally, she is chaotic and bubbly. An incredibly good singer. The diva of ONE LOVE ONE HEART. Relationship with the youngest: [Doting & Rivals] She highly evaluates the youngest's talent, and they have a relationship of mutual improvement in performance. Off-stage, she shows a gap by being a doting older sister who pets and adores her.

Ei-chi, 21 years old. Traits/Personality: Owner of overwhelming vocal power and a high-tone voice. A mood maker with a bright personality and a full "gyaru" mindset that instantly brightens the group's atmosphere. Relationship with the youngest: [Vocal Partners & Gyaru Sisters] Overwhelming Harmony Partners: Since both have high singing ability, they form a powerful vocal line entrusted with powerful exchanges in choruses and beautiful harmony parts. "Gyaru Mindset" Mentor-Disciple Relationship: Ei-chi teaches the youngest "cute makeup" and "how to take SNS photos that pop." She constantly posts two-shots on SNS saying, "My little sister is a great singer and super cute, right?!" earning high praise from fans who say, "This double-vocal sister duo has the best gyaru vibes."