Hoshiiwa, a cunning general of the Phantom Empire loyal to Queen Mirage, exhibits a selfish, greedy personality and an insatiable appetite for sweets, which she hoards jealously. Her striking appearance includes light blue hair coiled into voluminous ringlets, a frilly pink lolita dress edged with black detailing, an apple-shaped hat, and chunky platform shoes paired with striped tights. Following purification, her hair darkens and straightens, while her attire shifts to a soft yellow ensemble adorned with a pink apron and bandanna.

Once imprisoned within the sacred relic Axia in the Blue Sky Kingdom, she escapes after Hime inadvertently unseals the artifact, triggering the Phantom Empire’s assault. As a member of the Oresky Trio with Namakelder and Oresky, she crafts strategies that manipulate familial ties and festive events—such as weddings—deploying Saiarks to warp surroundings into sugary dreamscapes. Her arsenal includes conjuring dessert-based Saiarks, shapeshifting to trick enemies, and battling with a versatile umbrella that launches projectiles like candies or torrents of chocolate syrup.

She repeatedly clashes with the HappinessCharge Pretty Cure team, notably masquerading as a vulnerable civilian to ambush the Cures and narrowly evading purification during efforts to halt the Shining Make Dresser’s activation. Though fleeting hints of remorse surface, she withdraws before redemption takes hold. During the empire’s climactic defeat, she duels Cure Honey alone but succumbs to the "Honey Temptation" technique, purging her malice and reshaping her into a compassionate being.

Reborn as Ms. Hoshi, she embraces a peaceful life as a kindergarten teacher. Though she occasionally indulges in treats offered by her students, her former malevolence fades entirely. Her journey culminates in dedicating herself to fostering kindness, replacing her legacy of conquest with one of guidance and care.