More than anyone, Joe contributes to who Pip becomes. At first, Joe is a positive influence by telling Pip that he is "oncommon" and that he should not lie. After Pip moves to London and adopts a haughty attitude, Pip rejects Joe; yet, Joe's influence is present in Pip's rejection, for he feels guilty in his treatment of Joe. Always there is Joe, who represents the happiness and comfort of home. After being burned, Pip is carefully and lovingly tended by Joe, his father figure to whom Pip finally returns as a prodigal son, penitent for the years of rejection. "Ever the best of friends," Joe still tells Pip.
Another influence upon Pip is the convict Magwitch who places upon Pip his feelings of haunting guilt that lay upon him throughout the novel. Initially repulsed by Magwitch when the convict visits him in London years later to tell him he is the benefactor, Pip comes to realize the decency that is in the poor man of London streets who was a victim of his poverty. From Magwitch, Pip learns to appreciate the love that he does have; it is Magwitch's death that effects Pip's true maturity.
Pip's personality, like all of us, is formed from the many experiences and people he encounters in his life. Obviously, Joe contributes to Pip's caring and kindness. Even when Pip has been unkind to him, Joe takes care of Pip and pays his debts. Miss Havisham contributes to his expectations, She taunts him with Estella who contributes to both his sense of love and also abandonment. In addition, Magwitch makes it possible for Pip to have more "expectations" when he decides to make Pip a gentleman. This causes Pip to become more of a snob than a true gentleman. In the end, because of all of his experiences, he realizes who his true friends are when all of his "expectations" and money are gone. But that is the point of the book, which is really a coming=of-age novel.