The Question and Answer section for The Alchemist (Jonson) is a great resource to ask questions, find answers, and discuss the novel.
Gold is the result of successful alchemy, though the goal remains aspirational. It plays a large part in the play as the motivation for just about everything that happens. The gulls are all greedy for gold in order to achieve their dreams, and...
Which characters are you referring to?
This is a pretty broad question that demands more information than this short answer forum is designed for. Please check out the GradeSaver page on this work.