What's an interesting English literature topic for a research paper?

It sounds to me as though translation might be a useful part of your topic, since you are multi-lingual. Maybe you could compare translations of one passage by Coelho and describe the ways in which meaning and word use shift from one language to another. The meaning of the writing can shift in subtle ways based upon translation, since some idioms translate better than others in terms of cultural usage. Good luck with your project.

It sounds as though your topic is wide open. It can be difficult to choose a research topic if you don't have any specific ideas in mind. But you should definitely choose something that interests or excites you, and that you'd enjoy doing research on. Perhaps there is an English writer whose work you admire, and you'd like to find out if their backgrounds or other aspects of their lives influenced their writing? This would be a sort of biographical topic. Maybe the author you choose often writes about landscape in an interesting way (such as Thomas Hardy). Maybe there is a particular book, story or poem you enjoy, and you want to find out more about what inspired it, or what the response to it has been. 

One of the best ways to begin a writing project like this is to start with some "free writing" which basically means just starting to write without planning what you're going to say. See where your thoughts take you; you may even start out by writing something like "I have no idea what to write about!" Chances are you have some ideas floating around that will emerge as you put pen to paper. It's also a good idea to do a fair bit of writing before you begin doing research, in order to find out what you want to say or discover about your topic. Then you can look over those notes and form an idea and begin your project.

Good luck!

As an English literature student, can you suggest a topic for my research paper?

Try to avoid a "broad" topic and keep to your syllabus. Researching a specific author or a movement in English literature is a better strategy.  Since J.K. Rowling was mentioned, you could examine why a particular author became a success at a specific point in time.  You could compare the path to success of two authors like J.K. Rowling and Charles Dickens, so you would examine the publishing industry and the interests of the reading public from two different eras of British literature.