Honoka Kousaka is a second-year student at Otonokizaka Academy. Her family runs Homura, a Japanese sweets shop in Tokyo's Chiyoda district near Akihabara, where she lives with her parents, younger sister Yukiho, and her grandmother; both her grandmother and mother are Otonokizaka alumni. Childhood friends with Kotori Minami since early childhood due to their mothers' friendship, she later befriended Umi Sonoda during a game of hide-and-seek. In the manga continuity, she initially joined the kendo club with Umi, demonstrating tournament-level skill before quitting to pursue idol activities.

Her personality centers on persistent optimism and impulsive action on determined ideas, frequently driving group initiatives. This led her to found the school idol group μ's after seeing A-RISE perform, aiming to save Otonokizaka from closure by attracting new students through idol activities. However, her intense dedication sometimes causes overexertion, neglect of others' concerns, and recklessness, exemplified by disregarding her health during Love Live preparations in season one, resulting in physical collapse and a temporary withdrawal from μ's. She enjoys bread, strawberries, swimming, and collecting stickers, possesses an aptitude for finding lost money, but dislikes red and white bean paste despite her family's profession.

Honoka undergoes significant development across the series. Initially, her focus on saving the school and winning Love Live caused her to overlook Kotori's attempts to discuss studying abroad, triggering a near-disbandment crisis for μ's. Umi's intervention led her to acknowledge her shortcomings and return. By the second season, she showed greater consideration and self-awareness, organizing a group outing to soften the announcement of μ's disbandment after the third-years' graduation. She succeeded Eli Ayase as student council president, campaigning energetically to boost school morale and recruitment.

In *The School Idol Movie*, Honoka grapples with μ's dissolution following their Love Live victory. A mysterious woman guides her emotional journey towards accepting that the group's legacy will inspire future idols. This culminates in her decision to perform "Sunny Day Song" as a farewell, symbolizing closure and the perpetuation of their spirit, highlighting her growth into a leader who values moving forward while cherishing memories.

Beyond the main series, Honoka appears in spin-offs like *School Idol Festival All Stars*, interacting with next-generation idols from Nijigasaki High School and sharing insights on leadership and idol activities. Her kendo background occasionally resurfaces in manga depictions. She remains central to μ's musical performances, often serving as center in songs like "Snow Halation" and "Bokura no LIVE Kimi to no LIFE".

Physically, Honoka is recognized by her dark orange hair, typically styled in a side ponytail originating from a childhood gesture by Kotori, and blue eyes. Her official image color is orange, though her costumes frequently incorporate pink.