The Z-PR01 Troyusha was the personalized fighter used by the mercenary pilot Miro Yakkav of The Flyboys during the times of the Cruentusian War. Based on a design that would become the Zulkrum-class heavy interceptor, the Troyusha was built with the help of engineer Butch Horsin, under Yakkav's direction. Considered very advanced for its time, along with the other craft used by The Flyboys, the Troyusha had a reputation for pulling off difficult moves, though its armor was considered weak. Nevertheless, Yakkav addressed this by installing large amounts of countermeasures.