Kaoru Ryuzaki

An O-type Cancer who suits the image of summer and sunflowers. Always bright and full of energy. Likes to be praised, she's a hardworker who seeks out challenge. Kaoru also likes to praise others; when she sees someone that isn't in a good mood, she instinctively puts on a smile. The cheerleader of the 3rd Entertainment Division.

She met the Producer in the park and cheered him up as he picked up some documents that he had dropped. She revealed that she participated in some kids' television shows and interviews when younger. When the Producer scouted her, she was hesitant at first as she didn't know anything about idols. However, when the Producer told her that it consists of cheering people up, Kaoru happily agreed and asked the producer to become her teacher.

Kaoru is shown to be good friends and schoolmates with Mai Fukuyama, Nina Ichihara and Chika Yokoyama, the latter two being the same age as her. She holds her time with Producer (whom she calls Sensei) very close to her and has even come back to school after she walked nearly all the way home just so the Producer could pick her up. Kaoru is the fourth member to join the "Little Marching Band Girls" unit, where she plays the drums. When she is invited to be the police commissioner for a day, she tries to arrest Ai Togo but finds that it’s better to follow the rules and have an actual reason to arrest people.

Kaoru is very innocent and well protected from danger by older idols. She is not a very good cook but has fun trying her best. Kaoru is one of the youngest idols (along with Nina Ichihara and Chika Yokoyama), as well as the youngest Canary Summer member. Due to her age like her friends she is still quite naive and innocent.

Kaoru has the appearance of a very young still in growth pale little girl, being tiny in size, she has a short orange hair that reveals her forehead and uses hairclips, her eyes are big and yellow. She is the most boyish among the other girls of her age but still not enough to be considered a tomboy.