Pumblechook is the antagonist in "Great Expectations," a seed merchant who makes it his business to badger Pip from childhood on. The only thing Pumblechook appears to care about is status and wealth.
At one point, Pumblechook recommends Pip to a spinster named Miss Havisham, who's looking for a playmate for a girl she's taking care of. When Pip comes into good fortune, Pumblechook begins treating Pip differently. He assumes the money came from the eccentric Miss Havisham, and points out that he'd introduced the two. It turns out Miss Havisham wasn't the benefactor after all, but that still doesn't stop Pumblechook from claiming a major role in Pip's success.