Shouji Murakami is the man who becomes Guyver 0 in the manga and anime series Bio Booster Armor Guyver. He was the first human to ever activate a Guyver unit, long before the series' main events. As a Chronos test subject, he goes berserk after activating the unit, leading to catastrophic results and the sealing of the Guyver units for years. His actions set the stage for the series’ conflict, making him a tragic and pivotal figure in the Guyver universe.