Movie
Description
Kosuzu Kachimachi is a main character in the Love Live! multimedia project. She is a student at Hasunosora Girls' High School, initially a first-year in the 104th term before advancing to her second year. She is a member of the school's idol club and belongs to the subunit DOLLCHESTRA, where her image color is evenstar yellow.

Kosuzu comes from the city of Tsuruga in Fukui Prefecture, where she is the youngest child in a large, extended family of ten that includes her grandparents and cousins. Her family runs a fishing business, and as a result, she has a great fondness for fish and seafood and is unafraid of handling creatures like bugs. Her motivation for joining the school idol club stemmed from her deep admiration for a specific upperclassman, Sayaka Murano.

In terms of personality, Kosuzu initially presents as a highly anxious and nervous girl who struggles with extremely low self-esteem. She genuinely believes she has never accomplished anything remarkable in her life and often describes herself as a burden to others. She recalls trying to help with the family fishing business in elementary school only to be badly injured, which led her family to treat her as something fragile needing protection. Consequently, she developed a habit of setting herself seemingly pointless challenges, such as crossing a lake on a raft, just for the sake of feeling like she has achieved something. Despite her tendency to expect failure, she is remarkably eager to take on new things and possesses a relentless drive to keep trying, no matter how many times she stumbles. To pump herself up, she shouts Chesuto!!, a phrase she learned from her grandfather. While she can freeze up and speak rapidly when nervous, she is otherwise very matter-of-fact and direct. One of her weaknesses is a tendency to give up before even starting, and she is often oblivious to the difference between genuine courage and simple recklessness. However, a significant strength is her ability to recognize the good qualities in others, a skill she developed from spending a lot of time watching and envying people.

Kosuzu's role in the story begins with a failed attempt to cross the lake on a wooden raft, which results in her falling into the water. She is rescued by Sayaka Murano and Tsuzuri Yugiri, two members of the school idol club. With Sayaka's encouragement, she successfully completes her challenge. The very next day, Kosuzu approaches the two upperclassmen and asks to join them, becoming the third member of the unit DOLLCHESTRA. Her central motivation is to finally become someone who can accomplish things and find something she can be proud of. She has a significant connection to Sayaka, who recognizes Kosuzu's willpower and relentless work ethic as being similar to her own. Kosuzu's development involves gradually building her confidence through her activities as a school idol, moving away from her initial belief that there is not the tiniest fraction of a chance that things will go perfectly. She is also driven to succeed in order to show her family, who see her as delicate, that she is capable.

Kosuzu has a notable ability to identify and compliment the strengths of others, which helps boost their confidence. She has a hobby of collecting stationery and enjoys Ramune candy. Her favorite subject is arts and crafts, and her favorite animal is large dinosaurs, an interest reflected in some of her poses. Her personal motto is perseverance prevails. She refers to herself by her family name, Kachimachi, rather than her given name. Her room contains a monster plushie she calls Gonzareshi Shisho and a koala plushie named Koala Maneo that can record voices. She wears a small ribbon tied at the nape of her neck. Physically, Kosuzu is a short girl with pale skin, pale purple or pinkish eyes, and brownish-green hair that hangs past her shoulders. She typically wears her hair braided on either side of her face and tied at the back of her neck with a dark blue ribbon.