I'm sorry, I don't know the author of this 'tomorrow and tomorrow and tomorrow a novel' as the title is not very common in my knowledge. You could try searching for it in a library database or a good book search engine.
Another possible theme is the inevitability of change. Despite the repetition in the title, each tomorrow is different. The characters might experience different things and grow or decline, showing that change is always there even when the days seem to blend together.
I'm not sure as I haven't read the specific novel. But typically in novels, the main characters could be ordinary people trying to navigate their lives in the context of the themes related to the title, like dealing with the passage of time.
I think it could also imply a sense of monotony within novelty. While each tomorrow is new, the repetition of 'tomorrow' might suggest that there is a pattern to this novelty. It could be about how we often expect each new day to be different, but in reality, there are some underlying similarities. For example, we may face new challenges every day, but the process of dealing with them could be somewhat familiar.
Since I don't have specific information about the 'love of tomorrow novel', the main characters could be a diverse group. There might be a character who is a visionary leader in the future society, and through his or her journey, we see how love and leadership intersect. Another could be a young artist who uses their art to express the new forms of love emerging in the future. And perhaps there's a character from an older generation who has to adapt to the new concepts of love in this changed world, and their interactions with the younger characters would add depth to the story.
The main theme could be love in the context of the future. It might explore how relationships develop and are affected by the changes and uncertainties that tomorrow brings.