Matsuri Aoi serves as a central figure in the narrative, distinguished by waist-length pink hair, violet eyes, and a slim build. She stands 155 cm tall with body measurements of 90-59-86 cm. Her pale complexion pairs with a signature wardrobe featuring thigh-high stockings, miniskirts, ribbon hair accessories, and occasional waitress uniforms or resort attire like bikinis.

Her personality blends kindness with clumsiness, traits that consistently shape her interactions. She works part-time at the "A LO HA" resort facility, balancing waitstaff duties with cooking responsibilities, anchoring her within the primary setting.

Matsuri shares a complex, emotionally turbulent history with protagonist Kaito Kusakari. Their past relationship ended with profound heartbreak for her, leaving unresolved feelings that reignite during their unexpected reunion at "A LO HA." This positions her among several women from Kaito’s past who re-enter his life at the resort, intensifying interpersonal dynamics.

Her background entails navigating delicate relationships at the resort, particularly with Kaito and other women connected to him. Key plot developments trace her emotional journey, highlighting moments where lingering attachment and past pain surface as focal points of tension or reflection. These elements frame her role beyond romantic interest, emphasizing her struggle to reconcile past and present emotions.

Across official media like the visual novel *Tropical Kiss* and its sequel *Tropical Vacation*, Matsuri maintains narrative relevance through interactions and unresolved threads. Her character development ties implicitly to evolving dynamics with Kaito and others, with explicit progression rooted in interpersonal challenges.