Rina Samura is a high school student and member of the St. Catalano Girls' climbing team. She possesses waist-length dark purple hair, typically styled with bangs covering her left eye, and petrol-colored eyes.

During the Kanto Bouldering Championship, she advanced through the preliminary rounds and secured seventh place in the semifinals. While this result did not qualify her for the finals, it demonstrated her technical climbing skill. Her captain, Masumi Fujita, placed fifth in the same semifinal and expressed disappointment. Rina, alongside the rest of the team, offered collective support and encouragement to Masumi. This solidarity contributed to Masumi's subsequent recovery and victory in the championship.

Rina employs a distinctive climbing strategy known as the "Crimson Stormtrooper" approach. This involves acting as a "sacrificial lamp" during team climbs, deliberately demonstrating the correct route or sequence of moves for her teammates. By testing complex paths and identifying viable holds, she enables others to conserve energy and avoid potential mistakes. This method hinges on her own climbing expertise and situational awareness, allowing her to assess routes while navigating them.

Her surname, Samura, combines the Japanese characters for "sand" (沙) and "village" (村). Her given name, Rina, incorporates "village" (里) and "apple tree" (奈).