For roleplay purposes, one might want to take the part of one who is in tune with nature, and all about the nine divines, or something, and as such, daedric princes would be an enemy. Yet some can't be avoided and you have to get their stuff. That gets in the way sometimes, right? Well, there are two or three you can avoid by simply refusing, but the others are unavoidable. I read somewhere that when you have daedric artifacts and talk to vigilants of stendar, they will ask for the artifacts. You could give them willingly, therefor following your anti-daedric thing. Or simply sell them. Either way, you would follow that roleplay. If this sounded completely stupid, keep in mind that I haven't read ALL about daedric princes, and I haven't gotten farther than level forty something.