It's not easy being iconic
It's not easy creating iconic characters. If any one of us could do it whenever we wanted, we'd be making millions in Hollywood right now. Many of the great comicbook characters - Superman, Batman, Captain America, Captain Marvel - rose out of the Golden Age when 5 new superheroes would be invented every week and the cream rose to the top. No one knows you do it for sure, except maybe Stan Lee and his great period of character creation was very brief. Four years at most, in which almost all of Marvel's iconic characters were created - Spider-Man, Fantastic Four, X-Men.
For ordinary folks like ourselves and the good people at Hero, I think Busiek and Alan Moore have shown the way in Astro City and Supreme. You steal. You gotta, there's no other way. Take the essence of the character and muck around a bit with the superficial elements. Samaritan's from another time instead of another planet. Supreme got his powers from a meteor. You'll notice also that neither writer changed the name that much either.