I dislike this whole thing about predictability.
Well, it's Shor's gift to mortals to end this.
Would it be possible for the Daedra lords to become unpredictable?
No. Sheo is the only exception.
But I mean so Dagon could change the percieved sphere he encompasses and become a mortal-loving guy?
Funny thing, Dagon used to be the Kind Leaper Demon King, but since Alduin (who is the nordic version of Akatosh) caught and ate him, he became Mehrunes Dagon and is forced to destroy ALL of Mundus, every last single piece (an impossible task).
Or are they actually 'stuck'? I wouldnt think they are as they were around the same as the aedra etc.
Since the dawn of Mundus, the daedra were changed by it, even thought they had no part in it. They are their spheres.