Worldbuilding Exchange

I have a question about the best way to nominate something. I've nominated Calvino's Invisible Cities, which seems ideal for world building, but also is not exactly a standard novel with many characters and plot etc, so I'm not quite sure what to do about character nominations. Obviously I could nominate it with no characters (other than the 'No characters' and 'Original Character(s)' every fandom gets). On the other hand, since there are 55 different cities, it might be easier for people to offer if it wasn't quite so wide open, so I've currently put five cities in as characters (which I think they pretty much are); on the other hand, if you prefer, I'd be perfectly happy for it to go through with no characters.