Ryo Murasame is the protagonist of the 'Kamen Rider ZX' special, part of the long-running Kamen Rider franchise. Originally an air force pilot, Ryo is brainwashed and turned into a cyborg warrior by the evil organization Badan Empire. He eventually regains his memories and rebels against Badan, becoming Kamen Rider ZX. Ryo's journey is one of vengeance and redemption, and he plays a crucial role in uniting previous Kamen Riders to fight against a formidable new threat.