Punicorn originated as a mascot when Yui Yumekawa found her egg near a clock tower while investigating with Laala Manaka. The egg hatched spontaneously before Yui could open it, leading Punicorn to snatch one of Yui's rice balls and trigger a pursuit. Yui reclaimed the food but returned it upon noticing Punicorn's hunger, forging their first connection.

Her appearance features pale-yellow fur, large purple eyes, and curled lilac-pink hair. Pink ears with pale aqua interiors frame her face, while a horn decorated with a pale pink bow and yellow star crowns her head. She sports a matching pink tail, a light aqua collar, and signature gold wings like other mascot managers.

As Yui's dedicated manager, Punicorn communicates solely through repetitions of her own name, unable to form complete sentences. Nevertheless, she displays affectionate support, frequently devising ideas to aid Yui's idol endeavors. Her innocent, gentle, and simple nature coexists with keen observation and proactive assistance in managerial duties.

Punicorn and Yui's bond grew from their initial encounter into a mutually caring partnership. Her background marks her as the first mascot manager known to hatch from an egg and the inaugural mascot in Paparajuku's PriPara. She remains uniquely distinguished among managers by her exclusive use of self-referential vocalizations.

The name "Punicorn" blends the Japanese term "punipuni" (meaning squishy) with "unicorn," directly referencing her tactile softness and mythical inspiration to emphasize her gentle, physical essence.