Shu Iura attends Katagiri Senior High School in Class 3-2. He possesses distinctive green hair and green eyes, typically seen wearing a sweatshirt and purple headphones. At school, Shu exhibits an extremely loud, energetic, and outgoing personality. He frequently initiates group activities and pranks, leading friends and peers to find him occasionally annoying. This constant energy reportedly deters potential girlfriends, contributing to his ongoing lack of romantic relationships. He once stated, "If you take away my energeticness, what would be left..." acknowledging this trait as fundamental to his identity. He maintains close friendships, particularly with Toru Ishikawa, sharing music and discussing personal matters like relationships. He is also friends with Izumi Miyamura, lending him songs from his collection. His personality shifts dramatically at home. Around his younger sister, Motoko Iura, he acts subdued, cold, and serious. Despite this outward demeanor, he cares deeply for her. He supports her academically, arranging tutoring with Kyouko Hori for her high school entrance exams. When a teacher mocked Motoko's efforts, he threatened physical retaliation. He also demonstrated care by purchasing a good-luck charm for her exam success. Motoko initially misinterpreted his stern attitude as hatred, but his actions consistently stem from protective concern. The siblings live alone together, and Shu assumes responsibility for her well-being, though their interactions often involve arguments or physical confrontations. Regarding other relationships, his attempts to connect with Honoka Sawada fail due to her discomfort around highly energetic individuals. His sister remains possessive of him, often seeking comfort in his room during the night despite their conflicts. Shu stands 172 cm (approximately 5'8") tall and has a birthday on February 7. He ranked first in series popularity contests in 2011 and 2014. He hosted a segment called "Let's try asking Iura-kun!" involving character interviews.