I was at Bologna vs Fiorentina a few years back, in the curva..... that game is a fairly big derby for them.
I'd been to a number of games that week in the north..... Milan, Atalanta, Verona, etc..... but Bologna felt distinctly different and yes more Mediterranean/Southern Europe influence (despite only being an hour on the fast train from Milan).
The most alarming thing was landing in the curva in the middle of what appeared to be an internal war between the ultra groups.... up there with the most intimidated i've ever felt at a game.