Harumi Fujiyoshi holds student number 29 in Class 2-F. She actively produces doujinshi, specializing in yaoi content, and excels at imagining male character pairings. The Pine/Napple coupling is her favorite, frequently appearing in her work.

Her name merges "fujoshi" (a term for female yaoi fans) with "Harumi," the former location of Comiket before its move to Tokyo Big Sight, reflecting her core traits.

She has black hair reaching her shoulders and wears glasses. Despite athletic abilities that draw recruitment offers from sports clubs, she holds no personal interest in athletics or joining any teams.

Personality-wise, she reacts strongly when others mention or mock her hobby, often becoming visibly annoyed. Her interpretations of relationships and scenarios frequently turn explicit, especially involving pairings of her teacher Nozomu with other male characters. These tendencies lead others to view her interests as unusual or abnormal, prompting occasional criticism, particularly from Chiri.

Her family includes three older brothers working in the anime industry. Her mother states Harumi's birth was unplanned, a detail sometimes referenced in relation to her character.