A question more about headcanons than anything: considering that Molag Bal has vampirism, Hircine has lycanthropy, Meridia has Purified, Peryite has Afflicted, Namira has Dro'Mathra and shades and so on, what kind of "curses" do you think would other Princes have? Curses that deeply affect both body and soul of the mortals, that some view as blessings, that bind said mortals to that Prince forever with it being almost impossible to get rid of them?
Just a headcanon idea I like to explore
hmmm it's an interesting thought!
Were-creatues and vampires are taking previously established irl folklore and applying them to the princes, while the Purified and Dro'm'athra are their own things. I kinda like leaning more towards the former, personally.
I can't really picture the 3 Good Daedra nor nocturnal doing this sort of thing tbh. I don't have a reason for the 3 other than ~*vibes*~, but Nocturnal's influence is so subtle I can't see her doing/having that sort of thing.
I hadn't really considered the Afflicted as being particularly cursed in a similar way to those other examples, but given Peryite's more subtle influence, that interpretation could make sense. It makes me wonder what it's actually like to have that disease.
Mehrunes Dagon's would definitely be something destructive, and I imagine more permanent and obvious (as in, not something that could be hidden or suppressed like lycanthropy or vampirism) since he (and his followers) would probably embrace permanent change more readily (the whole prince of destruction and change thing). Like, I can see them being permanently transformed into some kind of monster.
Malacath, seeing as sometimes his sphere is seen as a focus on the ostracized and an emphasis on adversity and testing through hardship, could have a curse that really challenges the follower. I could see his more like a traditional curse, disabling the mortal in some way that makes it hard for them to get by in society (perhaps making them hideous?). I'm not super well versed in Malacath lore though.
Clavicus Vile's curse just turns people into politicians.
Sanguine has so much potential but idk if I'm clever enough to think of something good for him. Maybe something like a succubus?(although not necessarily needing sex. Just like a permanent sort of addiction, similar to vampires needing blood to seem "normal")
I can also think of less permanent "curses/blessings" (or at least things associated with the princes, not necessarily caused by them), like insomnia for Vaermina, mental illness for Sheogorath, cancer for Peryite, addiction for Sanguine, etc. I like the ideas of mortals attributing more normal afflictions to the Princes, whether they are actually caused by them or not.
Also, going by your definition, that would make Dagoth Ur and corprus behave in a similar way to the curses of Daedric Princes (besides the afterlife part of it). Something to ponder
I'm not the best source of Daedric Prince lore though, so I open the floor for more thoughts! Mine are likely not that deep or interesting