slug: should I use latin characters only?

I will agree with King Li.

Furthermore there is a very old plugin you can download from my dropbox that is still functional and will be of great help to you.

What it does is changing the greek slugs to latin characters (greeklish) automatically for all new posts/pages/custom posts . You will have to manually change your older slugs though. But it is really easy. You just press “Edit” on your slug, delete it and click “Ok”. Then, you update your post/page/…

To wrap it up, what you do is:

  1. Write your titles in greek. (10 + 1 τρόποι για εξοικονόμηση χρημάτων)
  2. The slug is turned from greek to greeklish (10-1-tropi-gia-exikonomisi-chrimaton)
  3. Finished

It is one of the very first plugins we activate on greek sites.