Kouhei Hayami is a prominent character in the series Kamen Rider Fourze. He serves as the main antagonist for much of the series, acting as the Libra Zodiarts, one of the Horoscope Zodiarts. As the elegant and calculating student council president, Hayami manipulates events from behind the scenes and enforces the will of the mysterious organization known as the Horoscopes. His calm demeanor hides his ruthless ambition, making him a formidable adversary for the protagonists.