Prinesica Yugiri, alternatively called Prine or Purine, is the younger fraternal twin sister of Pelselthe Yugiri. She has very long, straight white hair extending past her waist, featuring spiky bangs, alongside pink eyes with a gentle tareme shape and a slim frame with a pale complexion. Standing 160 cm tall with a C-cup bust, she typically wears a school uniform: a pleated skirt, thigh-high stockings, a ribbon tie, and a blouse with puffy sleeves, often paired with a ribbon hair tie.

Her demeanor is consistently calm, quiet, docile, and relaxed, which directly counterbalances her older sister's energetic and brash personality. Prinesica exhibits a profound sister complex, displaying deep attachment and devotion to Pelselthe. She consistently prioritizes her sister's well-being and happiness, motivating her decision to join the Tsuge Divine Music Player Office alongside Pelselthe after initially enrolling as a first-year student at the Torvas Divine Song Players Academy, ensuring they remain together.

A pivotal childhood event involved a near-fatal accident. To save her, her father's contract spirit, Dorislae, fused with Prinesica. This fusion altered her hair color to white and transformed her into a human-spirit hybrid, though it cost Dorislae her existence. It also left Prinesica with a constitution described as frail. Despite this hybrid nature, she functions primarily within human society as a student and later as a part-time office worker.

Her story remains centered on her bond with Pelselthe, lacking major personal evolution or standalone arcs in the available sources. Her role across media is consistently supportive, focused on observing and staying close to her sister.