one advantage of a fictional city is that you can have a crooked mayor. police chief ect. without worrying about defaming a public official and getting suied
since it was based on a form of pulp novel the destroyer i'd say remo Williams the adventure begins and its tv spin off pilot remo williams the prophesy
for clarification the street level reference means batman or daredevil and to an extent spider-man it also can be used to emulate non-costumed action hero, spy or martial arts movies the latter being ninja HERO