Another example: Naruto has to become stronger to defeat his enemy/Goku has to become stronger to defeat his enemy/hero has to become stronger to defeat his enemy = Heracles. Actually is funny, because shonen comics are the most obvious copy paste of the 12 step of the hero in a Heracles-kind.
Again, the discussion is about originality, and that, doesn't exist. We (artists, writers, crafter, etc) steal ideas and we made re-interpretations (as you will want to name, giving a twist), but it will only be good if we can make it good.
I think for every story there are a good amount of questions you can do yourself to start writing; "where", will help to know the place, time and context of the story (again the example of pirates). "Who", can help you to know who are the ones carrying the story (hero, antihero, team mates, bad guy). "Problem", what kind of problem does the characters or this world have. "How", who are going the character and/or world interact with this problem. And lastly, "Why", why does the characters/world act as they do.
Also there will be the discussion: Does the character carry the story or is the context? And according of your answer you will choose which one will be more important (still, you shouldn't let at a side the other). And of course you will have to ask yourself: "Who will narrate the story?", obviously you are always going to be the narrator, but, if you chose a character to be the center of the story, you will make more narrow the amount of information that come from the story to the readers (example: in Sherlock Holmes, the story is narrated through Watson, so what you can see, is what Watson see and heard).