Test pilot Larry Trainor was exposed to bizarre cosmic radiation, charging his body with powerful radiation. It also gave him the ability to project a superpowered energy being under his control. To keep from killing people with radiation, he had to be wrapped in special anti-radiation bandages. Truly an outcast, Larry joined the original Doom Patrol as Negative Man.
Negative Man was killed when the original Doom Patrol chose to sacrifice themselves in a horrible bomb blast to save a small village. But then he got better, but lost his radiation powers. Then he got them back. Then he lost them again. Then the energy being transformed him into Rebis, which is a completely different character. Nowadays he's back as plain old radioactive Negative Man.