Dekan-Oh (デカン王, Dekan-ō) also known as Proto-Buster King is the combination of three primary Buster Monsters. This mecha was prototype GammaZORD before the Trology series that happened to incompleted proto-MegaZORD.
Dragomula/DragoRobo is a son of Dillain and Misaki, Roho's primary Buster Monster. The Dragomula is actually two modes (way similar of GokaiLion) and transformed into battle/dragon mode. It has a two attacks as a vehicle mode and three attacks as a battle mode. The two attacks as a vehicle mode are Wheel Claw and Laser Blast. The three attacks as a battle mode are Laser Claw, Dragon Missles and Empire Beam. It used finisher attack was Drago Slash.
BusterEagle is the daughter of Langley, Yuruma's primary Buster Monster. The BusterEagle is used its powerful wing called Garuda Slash. It formed with Dragomula and BusterShark into BusterCarrier created by Roho.
BusterShark is a son of Emil and Marta, Ratasuke's primary Buster Monster. The BusterShark using its fin to create a whirlpool called Splash Tornado. It formed with Dragomula and BusterEagle into BusterCarrier created by Roho.