Akane Hino assists her grandmother in operating their family's traditional Japanese inn, the Hino-en. This responsibility forged her strong sense of duty, hospitality, and work ethic. Initially reluctant to become a Pretty Cure due to her focus on the inn, Akane eventually transformed into Cure Sunny, the fiery warrior embodying the sun. Her transformation call is "Pretty Cure Passionate Engagement! Moe! Moe!" She wields fire and solar energy in attacks such as "Pretty Cure Burning Shower" and "Pretty Cure Fire Strike."

Cure Sunny possesses immense physical strength and excels in close combat, often charging into battle with bold passion. Her personality is energetic, straightforward, cheerful, occasionally impulsive, and hot-tempered, reflecting her fire motif. Despite moments of stubbornness, she shows deep loyalty and protectiveness towards friends, family, and guests. She has a hearty appetite and can be clumsy.

A storyline involved her grandmother falling ill, forcing Akane to manage the inn alone. This intensified her initial hesitation about being a Cure, fearing she couldn't manage both roles. With support from teammates Hibiki Hojo/Cure Melody and Kanade Minamino/Cure Rhythm, she learned to balance her duties, realizing that protecting the town also safeguarded the inn and its people. This experience taught her to rely on others and manage her responsibilities alongside her calling.

Her development shows increasing confidence and emerging leadership qualities, sometimes mentoring newer Cures in crossover events. Her determination to protect springs from her deep love for her grandmother and the inn, symbols of warmth, comfort, and home. She maintains her energetic and passionate core, consistently bringing fiery power and unwavering spirit to the Pretty Cure team. In the film "Eiga Precure All Stars: Minna de Utau Kiseki no Mahō!", Cure Sunny joins numerous other Cures in a large-scale musical battle against a common threat, contributing her signature fiery power and passionate spirit.