Pina Sformklan Estoh, originating from a small country, transfers to Hakureiryō Academy in Japan driven by her deep passion for anime and otaku culture. She openly identifies as an anime otaku and expresses frustration at Japanese youths familiar with foreign operas yet unaware of contemporary domestic anime. This intense interest isolates her, as she struggles to find peers who share her enthusiasm for discussing anime, cosplay, or related hobbies, finding common ground solely with the school principal.

Her personality blends playful enthusiasm with moments of assertiveness. She actively pursues cosplay, notably recruiting Mimina Ōsawa for a doujinshi project after judging her exceptionally compatible with a character costume. Pina demonstrates persistence in this pursuit, chasing Mimina for days and physically grabbing her hand to secure participation. She shows emotional vulnerability, crying tears of happiness when Mimina agrees to collaborate. During cosplay, she engages in physically affectionate behavior like holding hands, cuddling, and cheek-rubbing with Mimina. She also exhibits clinginess, attempting to follow Mimina to locations such as summer villas and clothing stores.

Pina's interactions include controversial moments: touching Mimina's breasts in a dressing room while discussing personal fetishes and offering to massage them for enhancement, citing techniques from a doujinshi borrowed from the principal. She acknowledges enjoying teasing others, explicitly stating Mimina is "fun to tease" while giggling. She also reacts with flushed embarrassment during unexpected situations involving partial nudity.

Physically, Pina possesses gray hair reaching her hips, pink eyes, and stands 143 cm tall. Her typical attire includes a tiara, school uniform with a bow, and stockings. She employs an archaic speech pattern, using terms like "onushi" (you) and ending sentences with "ja".