Spacehawk (Open Source)

Origin
Spacehawk is from an alien humanoid planet and came to our world to protect us from alien threats. He helped in the Allies war effort among other heroes of the day, but shortly after the Atomic Bomb was dropped, he disappeared into the heavens. As more atomic (and then nuclear) weapons were tested, Spacehawk found that the Earth itself was poisoned. He could no longer touch the ground for fear of dying (his alien physiology was susceptible to such radiation). He has returned, but as long as the Earth continues to destroy itself, he may never come back fully. He hovers and flies everywhere on Earth, and even has an Earthbound wife, Ladyhawke, but if he ever sets foot on the ground, his body will begin to deteriorate at a rapid rate.