Coffret is Erika Kurumi's fairy partner, enabling her transformation into Cure Marine. He originates from the Tree of Hearts and journeyed to the human world with Chypre to find new Pretty Cures after Cure Moonlight's defeat. To blend in among humans, Coffret adopts the disguise of a stuffed animal, resembling a small, toy-like creature.

His personality is playful, cheeky, and sometimes spoiled, acting as a younger brother figure to Erika, contrasting with Chypre's calmer, sisterly demeanor. Coffret frequently ends his sentences with "~desu." His abilities include producing Heart Seeds, vital for revitalizing the Tree of Hearts after defeating Desertrians.

In the movie "Hana no Miyako de Fashion Show...Desu ka!?", Coffret accompanies the Pretty Cures to Paris for a fashion show organized by Erika's mother. He actively assists in combat against Baron Salamander. Notably, Coffret and Chypre work together to break the crystal ball imprisoning Loup-Garou, enabling Cure Blossom to free him. Throughout the film, Coffret maintains his role as Erika's supporter, aiding her transformations and participating in group efforts. His origin, personality, and functions remain consistent with his portrayal in the main series.