Hittel and his sister Katze form a sibling duo jointly operating the Ryu Gunner Derringer, a mechanized unit classified under the Gunman Material attribute. Sharing control of Derringer, they enable its transformation into the upgraded Ryu Wyatt Derlinger through the Spirit Stone. The unit stands 385 units tall, weighs 2003 units, and features a maximum output of 122000, speed of 47300, magic capacity of 5832, and defense rating of 4536. Its armaments include dual handguns, rapid-fire weaponry, and a double-barrel rifle that fires yellow laser beams and potent green energy projectiles. After class-changing to Ryu Wyatt Derlinger, the unit gains flight functionality and enhanced weaponry: a laser rifle, pectoral-mounted gatling guns, and missile extensions integrated into its firearm systems.