Kaho Kōzuki is the younger sister of Mahiru Kōzuki, one of the main characters in the series. She is an elementary school student, attending the fifth grade. Kaho is described as having brown hair that reaches her neck and brown eyes.

In terms of personality, Kaho is portrayed as a young girl with a strong admiration for influencers, which leads her to often make lively and exciting appearances when involved in video streaming. Her behavior is marked by a blend of youthful cheekiness and underlying familial affection. For instance, she playfully and sarcastically refers to her older sister, Mahiru, using a term that implies she sees her as a brother-in-law, a teasing gesture that reflects her naughty side. Despite this sarcasm, she genuinely values Mahiru as a member of her family.

Kaho's motivations are closely tied to her interest in the world of online influencers and her connection to her sister's creative endeavors. She is shown to have a cunning or opportunistic side, as her attitude towards Mahiru shifts noticeably when Mahiru gains recognition as a successful illustrator for the JELEE project. This change in behavior highlights Kaho’s admiration for popularity and influence, and how her perception of family members can be affected by their social status.

Her role in the story is primarily in support of her sister's arc. The dynamics of their relationship are significant, as Kaho’s evolving treatment of Mahiru—from sarcastic teasing to a more favorable demeanor upon Mahiru's success—provides insight into Mahiru’s personal life outside of her main social circle. Regarding notable abilities, Kaho’s primary skill is her engaging presence in front of a camera, as she knows how to make exciting content for video streaming, showcasing her budding talent for capturing attention in the digital space.