Miyuri Suzuhara is a middle school student with green hair and brown eyes, standing 1.71 meters tall, weighing 49 kilograms, and possessing measurements of 81-57-84. She radiates constant cheerfulness and shares a close friendship with Chihaya Hiragi, often teasing her about interactions with Natsuki. Miyuri harbors romantic feelings for Ryou and has a brother named Tsuyoshi.

Her narrative role emerges when suspicion about Chihaya's secretive conversations with Natsuki prompts her to investigate. This leads Miyuri to confront Sayaka Mizushiro at her mansion. Initially apprehensive, Miyuri ultimately shows courage during the encounter. The confrontation causes Sayaka to transform into the magical warrior Cerulean Blue, revealing her secret identity and explaining that her absences stemmed from physical weakness following detransformation. Miyuri questions why neither Sayaka nor Chihaya confided in her, receiving the justification that they feared alarming her; she responds with surprise rather than fear.

Later, Miyuri discreetly follows Chihaya and witnesses her transformation into the magical warrior Carmine through Natsuki's assistance, simultaneously discovering Emi Kojima's identity as Septem. This covert observation culminates in Miyuri confronting Chihaya near a tree and disclosing her knowledge of both Chihaya and Sayaka's secrets.