An SD-type Gunpla, Ayame assembled it with the concept of combining the Unicorn Gundam and a ninja. Its normal "Shinobi Form" uses the Unicorn Gundam's Destroy Mode as its motif, and by taking advantage of its small SD proportions, the Gunpla can display high mobility to the point where it can create copies of itself. Its "Kakure Form" uses the Unicorn Gundam's Unicorn Mode as its motif, it has enhanced sensors and can blend into its surroundings through optical camouflage, enabling high information-gathering abilities and stealth.
Ayame later built a bird-shaped support unit, the Armed Armor Hattori, for the RX-Zeromaru. By combining with the Armed Armor Hattori, the RX-Zeromaru can achieve a realistic proportions and obtain similar powers as the Unicorn Gundam. After the 1st Coalition of Volunteers battle, Ayame further upgraded the Gunpla to signify her break from the past and a fresh start. It now uses metal nozzles and the newest KPS plastic for all the joints. Additionally, most of its black-colored parts were repainted into white (with the exception of its chest), surface treatment was redone from scratch, and the edges significantly sharpened.