Midori Takamine is a student at Yunnenosaki Academy and a member of the RYUSEITAI idol unit under STARMAKER PRODUCTION, performing as RYUSEI Green. His family runs a greengrocer in the shopping district next to the academy, which led him to choose the school for its proximity. Academy staff recruited him into the idol course based on his appearance, despite his initial lack of interest in becoming an idol. He stands 179 cm tall with a well-built frame, light brown tousled hair, and light blue aqua eyes. His typical attire is the school uniform with an unbuttoned collar, a black sweater under his blazer, and green sneakers. His RYUSEITAI stage costume includes a green-accented leather jacket featuring galaxy-inspired purple lining, white pants, a green star necklace, fingerless gloves, and green boots. Midori exhibits a pessimistic, low-energy personality, frequently expressing sentiments like "I'm so depressed, I wanna die..." and finding tasks bothersome. He struggles with formal speech and often comes across as blunt. Despite his good looks, he lacks confidence and harbors insecurities about his height, leading him to restrict food intake to avoid growing taller. Mascot characters serve as his primary emotional support, helping him cope with idol practices and stressful situations. He dislikes horror, thrill rides, and fish eyeballs, while favoring pizza, basil, and collecting mascot merchandise. His hobbies include handstands. Initially, he participated half-heartedly in RYUSEITAI activities, frequently skipping practices and mumbling his catchphrase incorrectly: "The green flames are the mark of compassion... Healing everyone with things like mascot characters...". His turning point came during the Repayment Festival when unitmate Tetora Nagumo confronted his apathy, prompting Midori to deliver the catchphrase properly. This marked the start of his gradual acceptance of idolhood. By his second year, he actively committed to growth, acknowledging his unit's support and vowing to work harder. His singing voice is soft and tender, with stage performances characterized as modest. Midori maintains complex relationships within RYUSEITAI: He finds leader Chiaki Morisawa's enthusiasm stifling and views third-year member Kanata Shinkai as perplexing, though he occasionally seeks solace by visiting the ocean with Kanata. He shares a closer bond with first-year teammates Tetora Nagumo and Shinobu Sengoku. Due to a contract between his family's greengrocer and the academy, he regularly delivers vegetables to the cafeteria. His development culminates in a more resolute outlook, reflected in his later intro: "I’ve made up my mind to work my hardest" as the "infinitely growing RYUSEI Green".