Fan Casting

There have been many reboots of Batman and Superman, although each adaptation is usually unique in its own way. In order to keep adaptations different from each other, as well as different enough from the comics (but of course, keeping things people like about the characters and storylines), which comics, movies (superhero and non-superhero; they can be other superheroes' movies), shows, novels, etc. should inspire an adaptation of a particular character or the comics of a franchise?