Nick Carraway is the viewpoint character of Scott Fitzgerald’s The Great Gatsby. He is originally from a moderately wealthy family in the Midwest, like Fitzgerald himself, and still retains some of the innocence and moral values of his upbringing, even though he is seduced by the people, wealth, and glamour of New York. In contrast with many of the other characters, he has an ordinary, albeit well-paid, job on Wall Street. He major role in the novel is his connection with Daisy (he is her cousin) and Jordan (with whom he has a relationship). His main narrative function is that he possesses a clarity of vision others lack and serves as a moral compass.
As a reader you can view the relationship of all the characters in a non-biased way.