Another approach is to spread the love around. I have a modest example here:
Rocketed from a distant planet, young L'kell was blasted by cosmic rays en route to earth. Landing, he was adopted by a kindly couple who were caretakers at a secret monastery. They raised him to believe in truth and justice, but were murdered by evil ninjas. The sympathetic monks trained him to the peak of physical prowess, but he was restless and decided to seek his fortune at sea. His ship was hijacked by pirates, but he learned their ways, rose in their ranks, and eventually retired to Paragon City, where he was bitten by a radioactive superhero. An attempted cure infused him with a super-soldier formula, causing a latent mutation to manifest. Donning a costume inspired by his father's pyjamas, he became the hero known as...
Contrived Origin Man!