from the top of my head...

Milan and France always attack Dijon 1st w/ in intentionally weak armies

Milan wants Marseilles too, and Bern, and anything owned by the Player nearby.

Indeed, the Danes go for Stettin.
Poles always goes for the long trek to Magdeburg.
HRE does usually go for Metz, if they get it they always head for Antwerp.
HRE rarely makes an effort to keep Bologna. They lose it to anyone even w/ a full garrison
Venice likes Vienna
Moors always spends enough time early on to reach Timbuktu.
Portugal wants Leon
Hungary, Byz butts heads at Sofia

Interesting note. Once saw a very passive Hungary and an overaggresive Byz.
the Byz went as far as rebel kiev