Komari Kamikita serves as the sixth member of the Little Busters group and attends school with them. Her blonde hair, cut to chin length, features half-twintails secured by red ribbons adorned with stars, complementing her blue eyes. She typically wears a distinctive yellow jumper as part of her school uniform, while outside class, she occasionally dons lolita-style dresses rich in frills and ribbons. Physically, she stands 159 cm tall, weighs 45 kg, and has measurements of 83-57-84. Her personality radiates childlike optimism, marked by enthusiasm for fairy tales, picture books, candy, and frilly attire. Clumsy and impulsive, she maintains a happy-go-lucky demeanor while frequently sharing her "happiness spiral" theory—believing that increasing others' joy amplifies one's own. Academically, she ranks among her school's top ten students in English. She volunteers at a nursing home, where the elderly adore her. Beneath this cheerfulness lies unresolved trauma from her older brother Takuya's childhood death, causing post-traumatic stress disorder triggered by blood or mortality. These episodes plunge her into severe depression, manifesting as denial of his death, mistaking others for him, or retreating into delusions. Komari grew up visiting Takuya in the hospital, where he read her picture books like "The Little Match Girl," whose sorrowful conclusion deeply impacted her. After his passing, she repressed these memories, recalling only fragmented dreams of a hospital rooftop with laundry fluttering in the wind. In her visual novel route, Riki Naoe aids her memory recovery. A critical moment occurs when they find a dying kitten, reigniting her trauma and causing regression where she confuses Riki with Takuya. Riki crafts a picture book to help her confront reality, leading Komari to accept her brother's death and develop romantic feelings for Riki. She concludes that sadness is inevitable but happiness can resurge. During the Refrain storyline, after Rin Natsume recalls the "secret of the world," Komari gifts Rin her hair ornament, urging her to remain strong. She declares her own story complete but insists Rin must keep smiling. In the spin-off OVA Kud Wafter, she appears as a supporting character amid a dormitory relocation incident. The crossover series Kaginado features her in comedic, non-canon interactions with characters from other Key franchises, retaining her core traits like fairy-tale fascination and optimism, though without specific character arcs.