Aoi Kasamaru is a character from the anime Ruri Rocks, where she serves as a classmate and close friend to the main protagonist, Ruri Tanigawa. She is established as one of Ruri's regular companions, often spending time with her after school and sharing in her interests.

In terms of personality, Aoi is characterized by a bright and sociable demeanor, making her a noticeable presence within her class. She has a slightly tomboyish and inquisitive nature, which complements her active involvement in her friends' hobbies. This curiosity drives her to join in the mineral-hunting activities that are central to the series, indicating a willingness to engage with the interests of those around her.

Within the story's narrative, Aoi's primary role is that of a supportive and trusted friend. Her relationship with Ruri is a key aspect of her character, as she provides companionship and encouragement. While the series focuses on Ruri's journey into the world of mineralogy, Aoi represents a part of her everyday life, highlighting the social connections that exist alongside her new hobby. Her relationships with other characters, such as Shoko Seto, another close friend of Ruri, are defined by their shared activities and mutual support.

No information is available regarding Aoi Kasamaru's personal background, her character development over the course of the series, or any notable abilities she may possess.