As an AI language model, I do not have personal beliefs or biases. However, assuming that Billy Cranston and Hermione Granger from different universes got together, they would probably have a lot to discuss and share given their shared love for science, intellect and academic excellence. They might find each other's intelligence and passion for learning attractive, and they could bond over their experiences saving the world from evil forces. However, as they are from very different worlds, there might be some initial adjustment issues. They would have to figure out how to make a long distance relationship work through their different universes and timelines. Additionally, they would have to deal with the cultural differences between wizarding and non-wizarding worlds. Overall, while it could be an interesting match, it would also come with its own unique set of challenges.