The main character is the shepherd Santiago. He meets some interesting people on his journey to find personal treasure.
A minor character is a less important character. One such character is the old woman who tells his fortune in the first chapter. He has had a dream where a child appears in the middle of his sheep and then took him on a trip back to the Egyptian pyramids. She tells him that “dreams are the language of God” (p. 14) and “she tells him that there is a treasure in the Pyramids in Egypt (Wikipedia).
Another minor character is the Englishman, who tells Santiago that “everything in life is an omen” (p. 73) and lends him books on alchemy. He does not appear interested in the treasure. He carries a revolver because it helps him trust people (p. 93).
The king, Melchizedek is an important minor character. He is the king of Salem, and tells Santiago that he has succeeded in discovery his “personal legend” or “what you have always wanted to accomplish” (p. 22). He says people know this when they are young.
At that point in their lives, everything is clear and everything is possible. They are not afraid to dream, and to yearn for everything that they would like to see happen to them in their lives. (p. 22-23)
The caravan leader is another minor character. He tells Santiago, “I have the power of life and death for every person I take with me. The desert is a capricious lady, and sometimes she drives men crazy” (p. 74).