Yuuhi Koubuin is a major character in the Muv-Luv visual novel series, particularly in 'Muv-Luv Alternative'. She is the Imperial Princess of Japan and a key political figure, renowned for her intelligence, composure, and grace. Yuuhi maintains a dignified and reserved demeanor, often facing intense pressure due to her status. Her role is pivotal as she navigates complex political intrigue, serves as a symbol of hope for the nation, and influences critical decisions during humanity's fight against the alien BETA.