مفاعل نووي
At the end of "", it is revealed by Dr. Light that Proto Man's body has a fatal defect in its energy system, and as a result is in great pain and has a more limited lifespan. In "Mega Man Powered Up", Proto Man reveals in a dialog with the Yellow Devil that his reactor is already unstable, which due to being a Nuclear reactor, could result in disaster with "one big shock". In the various Mega Man manga, Proto Man has appeared in casual clothing, usually standing atop a building wearing a trenchcoat, sunglasses, slacks, and black shoes. His scarf is tucked into the trenchcoat, but still noticeable.