Heroes aren't born. They're built.
~ tagline to Iron Man (2008).
These are heroes who are actually created for good or evil purposes by their creator. Sometimes they can be creations that were once villains but became good by developing morals which lead to defecting to the side of good and turning on their creators to fight against them. Often these are heroes created for the sake of many good things such as saving people, fighting for salvation, and helping the planet.