Most people knows how to add fonts to their Kobo: create a folder called fonts in and paste the .ttf files. This can be used fit the readers personal taste, sure - but it can also be used to make the font fit the style of the book.
I have found a font called
Old Standard which tries to look like a font used in the late 19th and early 20 century.
http://openfontlibrary.org/en/font/old-standard
The font is way too thin. However, it fit really good with Victorian-style literature, such as content downloaded from gutenberg.org
So if you like old books, give it a try. It is not the most eye-friendly of fonts -- but for some books it looks "right".
(For really old books, try finding a blackletter font ... it takes a few page turns to learn reading it, though. The LCD-like screen of ebook readers would also make it fun to download a LCD-style font such as this:
http://openfontlibrary.org/en/font/segment14 {couldn't get that one to work, sorry} )