Certainly! However, anyone trying to buddy up to the nobles should take care to dress in a nobility disguise, or they won't get very far. If the royal characters mention that they are, in fact, royalty in their home countries, their chances of getting an audience with the empress will be much better. Things like the proper etiquette or identification (royal seals, rings, items, etc.) are also necessary to back up their claims.

If this is something you and a group would like to explore further, please let us know and we can discuss how to incorporate it into the plot.