Itsuki Nakano is a serious high school girl with long, vibrant reddish-orange hair featuring two distinctive star-shaped hairpins near her bangs, an ahoge on top, and bright blue eyes. She has a diligent, earnest, and somewhat prideful personality, striving to act as the responsible "mother figure" of the quintuplets, which often makes her stubborn and prone to bickering, though she is deeply caring, a massive food lover, and fiercely dedicated to her dream of becoming a teacher.

Yotsuba Nakano is an energetic, cheerful high school girl with short bobbed orange hair, a prominent green rabbit-ear ribbon, and expressive blue eyes. She has an overly optimistic, selfless personality and is always eager to help others, though her bright demeanor often masks deep-seated insecurities and a strong sense of guilt regarding her past academic failures compared to her quintuplet sisters.

Ichika Nakano is a mature high school girl with very short, stylish light pinkish-blonde hair, a single long strand framing the right side of her face, and sharp blue eyes. She has a playful, teasing, and confident personality, naturally taking on the responsible big sister role to guide her siblings, though she frequently hides her own vulnerabilities, struggles with an untidy lifestyle, and possesses a deeply ambitious side driven by her secret career as an actress.

Miku Nakano is a quiet, reserved high school girl with medium-length brownish-red hair that typically covers the right side of her face, bright blue eyes, and signature blue wireless headphones worn around her neck. She has a shy, introverted, and pessimistic personality, often struggling with low self-confidence and hiding her emotions, but she is also deeply determined, fiercely loyal, and secretly harbors a passionate obsession with Japanese Sengoku-period history.

Nino Nakano is a stylish high school girl with long, straight reddish-pink hair tied into twin-tails by black butterfly-shaped ribbons, blunt-cut bangs, and sharp blue eyes. She has a fierce, blunt, and tsundere personality, frequently acting hostile or protective to guard her sisters, but she is secretly deeply caring, highly skilled at cooking, and aggressively straightforward once she commits to her romantic feelings.