I have this story idea in which one of the main characters is a professional Elvis impersonator. Elvis himself never makes an appearance. No real people do. However, I don't know how I could write this without mentioning him. A lot. This has me a bit concerned about the Copyright implications. I have considered creating a fictional celebrity but I am not sure this would work. I have thought about it and I'm just not convinced the story would be the same if they were impersonating someone who wasn't an icon or immediately recognisable to the readers. Or, at the very least, it wouldn't work as well. Advice?