Kanon Otosaki is a central character who serves as the female lead. She is a seventh-grade student attending a private girls' school, which places her in early adolescence alongside her primary counterpart. Physically, her most defining trait is her height; she is notably tall for her age, with a lanky build that she initially views as an insecurity or complex. She has pink eyes and pink hair that reaches chest-length, often styled with a side ponytail and hair ribbon.

In terms of personality, Kanon is initially portrayed as the quiet, shy, and introverted type, distinctly reserved and lacking in self-assertiveness. She is a thoughtful individual whose caution balances the energetic outbursts of her peers. Despite her timidity, she possesses a strong sense of determination and a nuanced realism that makes her relatable; she is full of doubts but also driven by a curiosity about the world that pushes her to try new things. Prior to the events of the story, she hid her passion for dance from her family, believing that in her proper, traditional household, something like street dancing would not be accepted. To express herself, she created an anonymous online persona known as "Rhythm," under which she posted videos of her original dance routines while hiding her face.

Kanon's primary motivation evolves from a desire for self-expression to a deep commitment to her team. Initially, dancing alone in secret was her only outlet. However, after meeting Haneru, she finds the joy of sharing dance with someone else, which encourages her to step out of her shell. She is driven to improve her skills not just for personal glory, but to contribute meaningfully to the success of Tribe Cool Crew. Her role in the story is that of a foundational member of the group. She forms the initial duo with the protagonist Haneru after he discovers her practicing in a secret rehearsal space. Together, they eventually merge with the three members of Tribal Soul to form the main unit, Tribe Cool Crew.

Kanon's key relationships are central to her development. Her partnership with Haneru is particularly significant; while he is short, hyperactive, and spontaneous, she is tall, reserved, and deliberate, yet their contrasting natures create a balanced and effective duo. She respects and admires his skills but is not merely a follower; her common sense often serves to ground his wilder ideas. She also forms bonds with the older dancers Kumo, Mizuki, and Yuzuru, looking up to them as mentors and teammates who help her grow.

Kanon undergoes significant character development, primarily centered on overcoming her insecurities. She starts as a girl who tries to make herself small and inconspicuous, literally using her body language to avoid standing out. As the series progresses, she breaks out of her shell, gaining confidence through the support of her friends. A notable point of development involves a unique dilemma related to her increasing talent. As she grows both in skill and physical height, she becomes so proficient that she subconsciously begins restricting her own dancing to stay in sync with the rest of the group, fearing that standing out as an individual "star" might disrupt their unity. This internal conflict highlights her self-consciousness about her height and her deep-seated desire to keep the crew together, even at the expense of her own potential.

Regarding her abilities, Kanon is a highly skilled and talented dancer. She excels at moves that utilize her long limbs, giving her a distinctive range and style that sets her apart. Her natural aptitude for dance is evident from the beginning, and she possesses a good sense of rhythm and execution. As "Rhythm," her skills were already recognized online before she ever performed publicly, proving that her talent is intrinsic rather than learned solely through practice.