Prunce serves as a UFO-like alien assistant to the Star Princesses. He journeys to Earth alongside Lala and Fuwa on a mission to locate the Pretty Cure and aid in reviving the scattered Star Princesses. His duties involve operating and maintaining Lala's rocket ship during space travel, tasks he often performs in a frantic manner during high-pressure situations like battles or meteor showers.

He frequently accompanies Yuni, sharing experiences such as evading the persistent space detective Mary Ann. Prunce openly voices frustration about Mary Ann's relentless pursuit, describing her as annoying during these chases. During the events concerning the Star Drop UMA, Prunce observes and supports rather than directly participating in earthly adventures involving UMA's teleportation or global travels. He later celebrates the birth of UMA's new planet with the Cures and Fuwa.

Prunce's primary function centers on supporting the Cures' missions through transportation assistance and companionship. He shares a close bond with Fuwa, acting as one of her caretakers alongside Lala.