The information about this character is primarily documented by fan-maintained sources rather than official materials. Based on those sources, Kagami Kusakabe is a first-year student at Hagun Academy and a classmate of the main protagonists, Ikki Kurogane and Stella Vermillion. She is the founder and a dedicated member of the school's newspaper club, and she aspires to become a professional journalist.

In terms of appearance, Kagami is a short girl with peach-blonde hair that she often styles with red ribbons, and she is typically seen wearing glasses along with the standard female school uniform. Her personality is notably flirtatious and cunning, showing a willingness to use any means necessary to obtain an exclusive story or scoop for her newspaper. This includes using seductive tactics during interviews or spying on others to gather interesting information. Despite her scheming nature, she forms genuine bonds with her classmates, having grown close to Ikki and Stella after becoming interested in Ikki following his match against Stella. She also possesses a wild imagination, often fantasizing about the relationship between the two main characters.

Her role in the story is primarily that of a supporting character who provides investigative assistance. She sometimes accepts requests from Ikki and others to research information about other Blazers, and she has demonstrated a sharp, analytical mind by compiling detailed information on the strengths, weaknesses, and rankings of many Blazers. She is also an aspiring photographer and has a memorable moment of taking a cheerful photo of Ikki and Stella together on a podium. Her abilities as a Blazer are not clearly defined in the main narrative, but she has shown a duplication ability, which she used in one instance to slip past security to get a photograph.