Karen Minazuki, alias Cure Aqua, attends L’École des Cinq Lumières as a third-year student and ascends from student council member to president. Hailing from an affluent family with parents often absent due to global music tours, she grew up under the care of her butler, Jii-ya, masking childhood loneliness with a composed demeanor. Her bond with Komachi Akimoto, forged when Komachi supported her during a demanding first-year project, became pivotal to her emotional resilience, anchoring their unbreakable friendship. As the "Pretty Cure of Intelligence," Cure Aqua commands water-based abilities, activated by her transformation call, "Blue Spring of Intelligence, Cure Aqua!" Initially resistant to joining the team due to a fiercely independent streak, she committed fully after pledging to shield her friends in a decisive battle, unlocking her blue butterfly emblem. Early friction with teammates Nozomi Yumehara and Rin Natsuki, rooted in clashing temperaments, matured into mutual trust through shared trials and introspection. Her journey traces a path from emotional solitude to embracing interdependence, catalyzed by her friendship with the fairy Milk, which ignited her aspiration to study medicine. As an adult, she navigates a medical career while sustaining ties to her Pretty Cure allies. Crossovers such as *Precure All Stars DX: Minna Tomodachi—Kiseki no Zenin Daishūgō* spotlight her tactical prowess during alliances against threats like the entity Fusion. Notable traits encompass her exacting recall of student details, a habit of concealing stress beneath stoicism, and occasional bluntness under duress, exemplified by a tense critique of Komachi. Her Cure Aqua design blends blue-and-white hues with butterfly imagery, progressing through enhanced forms like Super Cure Aqua and Rainbow Cure Aqua, which amplify her powers and introduce elements such as layered outfits or ethereal wings. Trivia notes her as the franchise’s first Cure to initially decline transformation, her emblematic iris flower representing empathy, and preferences for grape juice and oolong tea. She plays the violin, reflecting her family’s musical legacy, and holds distinction as the inaugural blue-themed Cure. Her name, Minazuki Karen, merges "Minazuki" (a June synonym evoking water) and "Karen" (meaning "pure"), echoing her aquatic abilities and layered persona.