Movie
Description
Kaido Minami, a second-year student at Noble Academy, earns the title "Academy Princess" through her proper demeanor and strong sense of responsibility. She possesses long teal hair, typically styled with a braid over her left shoulder, and blue eyes. Her elegant civilian attire often features pale blue blouses with lilac ribbons, pencil skirts, and heels, changing with the seasons. Initially hesitant to express her true passion for marine biology over her family's business, Minami eventually pursued this dream, becoming a marine veterinarian as an adult.

Transforming into her alter ego, Cure Mermaid, the "Princess of the Sea," her hair lengthens into an ocean-blue ponytail with dark ombre and purple streaks, adorned by a gold tiara with a seashell motif. Her costume includes a midriff-baring top with pearl details, a layered skirt resembling flowing water, and fin-like tails at the back. In combat, she accesses multiple Mode Elegant forms: Mode Elegant Ice showcases diamond-adorned accessories and a pearl-blue skirt with indigo ruffles; Mode Elegant Bubble incorporates gradient skirts and bubble-themed elements; Mode Elegant Sango features a scalloped gown with coral and shell motifs. Her primary attack is Mermaid Ripple, while her exclusive Mode Elegant technique is Ocean Shower.

Calm, nurturing, and fair-minded, Minami often acts as an older sister figure, though she can be occasionally strict and harbors a fear of ghosts. Her determination to aid others drives her actions, like shielding Haruka Haruno from a Zetsuborg attack, triggering her transformation into Cure Mermaid. This resolve deepens when distress over her injured dolphin friend Tina manifests the Miracle Bubble Dress Up Key, healing both and enabling her brother Wataru's rescue.

Participating in the Spring Carnival in Harmonia during *Eiga Precure All Stars: Haru no Carnival*, Minami supports Haruka during vocal performances and helps free captured fairies after villains Odoren and Utaen steal transformation devices. Her leadership and teamwork contribute to calming the kingdom's guardian dragon using the Rainbow Tornado attack, reinforcing Haruka's confidence through her encouragement.

Key relationships define her development: She initially scolds Haruka Haruno for tardiness but bonds through ballet tutoring, evolving into a trusted confidante. She shares a deep, reciprocal bond with Tina, who saved her from drowning as a child; Minami later returned the favor in battle. Kirara Amanogawa nicknames her "Minamin," reflecting their growing camaraderie. She helps Towa Akagi confront her fear of darkness and defends her identity as Cure Scarlet. She maintains a close connection with her older brother Wataru and parents.

Her name reflects her aquatic theme: "Kaido" combines "kai" (sea) and "do" (wisteria), while "Minami" means "south" or "beautiful wave." She is the fifth student council president in the franchise and the third blue Cure with water-based abilities. Her birthday coincides with Japan's Ocean Day.