Aoi Futaba, known as Vivid Blue, is one of the main characters in the anime series Vividred Operation. She is the best friend of the protagonist, Akane Isshiki, and serves as an integral member of the team that protects the world from mysterious alien entities. Aoi is characterized by her calm and collected demeanor, as well as her exceptional intelligence and strategic thinking. She transforms into Vivid Blue using the Vivid System, where she gains enhanced abilities to fight alongside her friends. Her friendship with Akane is a central theme, highlighting the power of teamwork and trust.