Who Is the Central Character of The Great Gatsby, Nick or Gatsby?

In the story the Great Gatsby , written by F. Scott Fitzgerald , we have actually two main or central characters- Nick and Gatsby. But which one is he more important one?
Nick is a young and attractive person, who comes from a middle class business family. He is educated and intelligent . He is the person , who tells the story, so his characteristics are observing and listening. That's one reason , why he is an outsider, because he is reserved and quiet.
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