Ploria Ōkanda, Gloria Ōkanda's elder sister, presides as principal of a private high school in Prance. Her distinctive appearance features long, curled silver-gray hair typically swept to one side, golden eyes, red lipstick, and pale green eye shadow. She wears a dark blue dress paired with a sun hat adorned with red roses and lace accents, complemented by scarlet and gold oval-shaped earrings.

Her personality reveals a passionate and competitive streak, especially concerning her interests. Alongside Gloria, she is a devoted fan of the idol group WITH. This shared fandom once sparked a physical altercation between the sisters over sunglasses touched by the group.

Ploria drives the central conflict in her debut narrative. After Gloria returns to Pripari with Falulu and Gaaruru, Ploria reunites with her atop the Eppel Tower. Their initial elation swiftly descends into a heated quarrel over trivial matters. This ongoing dispute generates negative energy manifesting as black clouds that spread across Pripari, threatening PriPara's existence by draining its sparkle. The conflict persists until multiple idol groups intervene with a live concert, restoring harmony. This resolution leads the sisters to forgive each other.

She notably owns a vacuum cleaner named Tiha. Ploria is the sole new character introduced within this specific film appearance.