In the Dr Faustus novel, Dr Faustus is the main character. He is a man who is eager for more knowledge and power than a normal human can have. Mephistophilis, the agent of the devil, is another important character. He tempts Faustus and is involved in all the deals and interactions. There are also some minor characters like the Good Angel and the Bad Angel which represent Faustus' internal struggle between good and evil.
In Dr Faustus novel, there are several important themes. There is the theme of ambition. Faustus' ambition to transcend human boundaries drives him to make a pact with the devil. The theme of redemption also exists, although Faustus ultimately fails to achieve it. His journey shows the complex relationship between human desires and moral and religious boundaries.
Doctor Faustus himself is of course the most important character. He is the protagonist whose actions drive the story. Then there is Mephistopheles, the devil's agent. He is the one who makes the pact with Faustus and serves as a tempter throughout the story.
The theme of damnation is also prominent. Faustus, by selling his soul, is condemned to eternal punishment. It shows the consequences of making a deal with the devil. Additionally, the theme of the futility of worldly pleasures can be seen. All the things he gains through his pact, like magic and knowledge, in the end, don't bring him true satisfaction.
As I don't know the specific Claude Faustus' love story, in general, key elements in a love story could include the meeting of the two people in love, the development of their feelings, and the challenges they face. For example, in many love stories, there's an initial attraction, then they get to know each other better and might face external or internal obstacles.
Since there's not much information given about this Claude Faustus, it's hard to say exactly what the love story is. It could be a very complex and unique love story set in a fantasy world, or perhaps a more down - to - earth one in a historical context. But without knowing the source or more about the character, we can only guess.