I assembled a list to work from when I was doing my revision of the "Wellsprings of Creation" setting because I wanted to be sure I hit all the tropes. Naturally, I can't find it now. Things I remember include:
- A four-way moral universe (good/evil/bunny/squid); the DFRPG has "the Devil" as the ultimate source of evil, but GURPS DF does not (at least, not officially).
- An East from which martial artists and ninja originate
- A North from which barbarians originate
- Monarchy as the predominant political system
There's more, but not a lot more.