Eishin Flash is a character from the multimedia franchise 'Umamusume Pretty Derby,' which features anthropomorphized racehorses as young women with equine traits. Eishin Flash is portrayed as a diligent and serious horse girl, known for her disciplined approach to training and races. She is characterized by her calm demeanor and strong sense of responsibility, striving to become a top racer. In the series, Eishin Flash's role is to inspire and challenge other characters through her dedication and perseverance, creating a benchmark of excellence within the racing community.