Is there any character like that?

[Dobri]

If the language is not Latin, nor German, would not Slavic be the most logical assumption, since Slovenian was spoken in the Middle Ages in entire Carinthia, Carniola, Styria, Istria, parts of Tyrol, and Veneto and Friuli region of Northern Italy.

For the cipher language to be of Slavic origin, it has to include some distinctive features.
For example, the Slavic prefix "po" has to be taken into account. 
One simple encoding option is that "po" could possibly be the ligature qo.