For typographia, I thought that a bookshop would be a good background. The conversation could center around the increased availability of books, the process of printing, as well as contemporary works. It would be able to blend the aspect of printing with people's access to books.
The avatar could be a bookseller, who has a printer friend come by as well, or a poet, or an avid reader. It would depend on what specifically we want to do with typographia.