John Mayer, an American personality psychologist, specializing in issues related to personality, explains the negative and positive sides of character traits by proposing that the negative one is based on unreasonable, timid behavior , and apprehensive attributes, while the positive side concerns logical, courageous and gallant traits. It is important for a person to identify his different characteristics and try to balance them so as to avoid various mental aberrations. “The Secret Sharer” is the story of a sailor with two-faced personality attributes, narrated by Joseph Conrad. In order for the audience to understand the distinct identities, Conrad incorporates the doppelganger theme into his story. According to the story, a young captain possesses a cowardly character, which is not good for a captain commanding a sailing ship. People who are supposed to “lead others or be their leader should have fearless, heroic, and domineering characters” (Mayer 215). Due to his restless character, the captain first refuses to introduce himself to Leggat who he saves from the sea. The narrator states that "I thought the time had come to declare myself 'I am the captain'" (Conrad 2). The statement shows that the captain is reluctant to reveal himself because he is aware of his spineless nature, given that he is the captain According to Mayer, "Most people in leadership positions with weak character traits are often afraid to reveal their status to others" (Mayer 273). and acquire Leggatt's The narrator states that "I had become so connected in thoughts and impressions with the secret sharer of my cabin that I felt as if, personally, I had been given to understand that I, too, was not the type. this it would have been fine for the first mate of a ship like the Sephora. I had no doubts about it