TV-Series
Description
Kaoru Ryūzaki is a nine-year-old idol trainee who originally comes from Ehime Prefecture before her involvement with the idol industry. Her physical appearance is characterized by orange hair and topaz eyes, and her image is strongly associated with summer and sunflowers, reflecting her vibrant personality. Standing at approximately 132 to 135 centimeters tall and weighing around 32 to 34 kilograms, she fits within the age and height group that defines the unit of which she is a part. Her zodiac sign is Cancer, and her blood type is O.

Kaoru's personality is defined by a bright, energetic, and cheerful disposition. She possesses a natural enthusiasm for life and approaches every situation with optimism, including activities she does not necessarily excel at, such as cooking. She has a strong desire to bring happiness to others and is driven by the wish to cheer up anyone who seems to be feeling down. Being praised is something she greatly enjoys, and this love of positive reinforcement fuels her challenge-seeking nature, making her a very hardworking individual who is not afraid to try new things. Her innocence is a defining trait, and older idols often feel a protective instinct towards her.

The story of her entry into the idol world begins with a chance meeting with her Producer in a park, where she helped him gather scattered documents. Prior to this, she had some experience in front of a camera, having appeared on children's television programs and in interviews alongside her mother. However, she was initially hesitant when scouted, as she knew nothing about being an idol. Her perspective changed when the Producer explained that an idol's job is to cheer people up, a concept that resonated deeply with her desire to spread joy, leading her to accept the offer wholeheartedly. From that point on, she began addressing the Producer as Sensei, a term that signifies the close mentor-student bond they share. She deeply cherishes their relationship, as shown by an occasion when she retraced her path from school just to ensure he could walk her home.

Within the narrative of the U149 branch, Kaoru serves as a unifying and cheerful presence among her peers. She is good friends and schoolmates with other young idols, particularly Mai Fukuyama, Chika Yokoyama, and Nina Ichihara. She also has a relationship with Ai Togo, whom she admires like an older sister, though their interactions are sometimes marked by playful misunderstandings, such as when Kaoru attempted to arrest Ai during a role-playing event. Her role in the group extends to performing in various units, including the Little Marching Band Girls, where she plays the snare drum. A noteworthy moment of growth for her involves the group's name, U149, which is a reference to the members being under 149 centimeters tall. When the topic of eventually outgrowing the group arises, Kaoru openly voices her worries about this potential future separation, showing her attachment to the team. Her own dedicated episode in the anime adaptation highlights her established character and her formal adoption of the Sensei title, and she frequently appears in other episodes as a background presence that provides warmth and comedic relief. Her notable abilities include a talent for speaking and leading spirited talk battles, as well as playing the drums in the marching band.