Miku is an emotionless looking girl with medium-length red hair that has strands of hair hanging over the right side of her face . Her notable accessory is a set of blue wireless headphones that have a triangle-shaped logo on the ear cups. Like her sisters, she has dark blue eyes, an average height, a well-endowed figure and large breasts. Miku is initially depicted as a shy and introverted character who struggles to express herself and communicate with others. However, as time progresses, she begins to come out of her shell and develop her own sense of confidence and individuality. Miku is particularly interested in literature, and her love for books is a central part of her character's identity. Miku is a silent and reserved girl who has a pessimistic way of thinking and low confidence, even to the point of belittling herself. You note that she doesn't have faith in herself. In contrary to her reserved self, she can talk in a straight forward manner and doesn't hesitate to confront others. She can also be slightly possessive, as she doesn't react well when Yotsuba kisses you, and overall she gets pouty whenever another girl, especially one of her sisters, gets a little too close for comfort with you.

Nino is a cute and cold-looking girl with shoulder length hair that has square bangs hanging over her eyebrows. She has reddish-pink hair, ranging from light pink to telemagenta. Her notable accessories are twin butterfly-shaped ribbons on both sides of her head. Like her sisters, she has dark blue eyes, an average height, a well-endowed figure and large breasts. Nino has an outgoing personality and is socially aware, resulting in her having many friends and is a social butterfly. She has a sharp tongue and talks bluntly when confronting others, even to her sisters. Her rebellious attitude makes her the least cooperative girl among the sisters, making her archetype resemble that of a "tsundere".

Ichika is a girl with very short hair that has a single long strand on the right side. She has white-pink hair colour, ranging from oyster pink to light pink shade. Her notable accessory is a single earring. Like her sisters, she has dark blue eyes, an average height, a well-endowed figure and large breasts. Ichika acts as the eldest sister of her sisters, as she seems to have a calm and composed demeanor; making herself an approachable person.

Itsuki is a serious looking girl with medium-length hair and an expressive ahoge. She has reddish-orange hair colour, ranging from light pink to salmon pink. Her notable accessories are a pair of star-shaped hairpins near both of her eyes, she has dark blue eyes, an average height, large breasts, and a well-endowed figure. In class, or when she does activities that involve academics, she wears glasses. Itsuki is a serious and earnest girl who usually wakes up early unlike her sisters. She is well-mannered; never being late or missing class, and always speaks formally. In the Japanese script, she almost exclusively speaks with a keigo speech pattern. Nino, her older sister, comments that Itsuki is too strait-laced. She has a huge appetite and is frequently seen eating something or being hungry.

Yotsuba is a fair-skinned teenage girl with short, straight hair that stops just around her neck. While her actual hair color is pink, she is portrayed to have a light-orange hair color. Her most notable accessory is a bunny ear-shaped ribbon. Like her sisters, she has dark blue eyes, an average height, a well-endowed figure, and large breasts. Yotsuba is an active, cheerful and easy going girl. She talks in a loud, spontaneous and sometimes absent-minded manner. She is the type of person who can't say no to people who need help and is mostly seen helping others; either directly and indirectly. While cheerful on the outside and towards others, she harbours feelings of inferiority towards her sisters and her own abilities. Because of this, she grew a desire to be different from sisters. She shortened her hair, put on a ribbon and excelled in extra-curricular activities.