Well, who is he? Being the main hero of the book The Alchemist we adore him. He was born in a small town, attends a seminary and when he grows up, he starts traveling. He likes this so much that asks his father permission to become a shepherd that allows him to travel a lot through all the world. On day, he meets a mysterious man in the town of Tarifa, who sends him on a journey to the other side of Africa. And after this, all the journey starts.
Santiago is kind, open-minded, and easy-teaching. He also values his freedom very highly that is why he became a shepherd and he is reticent to get involved in things which threaten his freedom.