Duo is a minor protagonist from the classic Megaman series. Hailing from parts unknown in space, he serves as a peacekeeping robot seeking out any sources of evil energy to destroy. He'd even cross paths with Megaman in his search to vanquish a certain robot that was the source of the energy.

He has a rather stocky build with disproportionate sections to his armor with the right arm, helmet, back thruster wings and legs being mostly blue while his torso is orange and well as part of his enlarged left arm. His fist of his left arm appears to be a different form of hand than his right. At one point he had an original form far different than his current one, being of a more even build and being all white with blue trims along his armor.

Fueled by his strong sense of justice, he possesses some form of power to be able to physically interact with forms of evil energy and thus destroy/purify it. In combat he is capable of high speed flight and can propel himself as if he were a meteor