Hailing from the planet PuruPuru, Prunce once served the Star Princesses within the celestial halls of the Star Palace before their dispersal across the cosmos. Charged with safeguarding Fuwa—a fairy forged by the princesses as their final hope—he allies with Lala to seek out the legendary Pretty Cure warriors. His malleable form, capable of shifting shape at will, proves invaluable in navigating obstacles and confronting adversaries throughout their quest.

Following their rocket-bound descent to Earth alongside Lala and Fuwa, Prunce aids in gathering the twelve Princess Star Color Pens—artifacts crucial to resurrecting the Star Princesses and reestablishing universal equilibrium. Beyond battlefield contributions, he delivers tactical assistance and levity, exemplified by his whimsical invention of a device crafting his cherished Star Donuts. These sugary creations emerge as a signature symbol interwoven with his identity.

Unwavering in his allegiance to the Star Princesses' vision, Prunce steadfastly prioritizes Fuwa’s protection and the Cures’ objectives. His dynamic with the team blends cheerful reliability with mischievous humor, countering Lala’s solemnity with light-hearted camaraderie. Years beyond their climactic battles, the epilogue depicts Prunce enduring as both guardian and companion, sustaining his supportive role even after Fuwa’s awakening and the cosmos’ return to harmony.