The obvious answer is Jyggalag, given that he was so powerful that all the other Daedra had to work together (probably the first and last time that ever happened) just to temporarily stop him... and there's nothing that says that Jyggalag didn't LET them do it. I mean, he claims that there is no such thing as free will, that the future is immutable and known to him, thus his return after the last Greymarch would also be something he would know would happen.
If you disregard Jyggalag, my second answer would be Sheogorath, because anything that is referred to as "as Sithis-shaped hole in the world" is not to be fucked with.
If neither of them counts (as they're really the same being, or at least were for a long time) then it'd have to be Nocturnal, merely by the fact that she's the only Deadra we've seen fully manifest herself in Mundus after Martin sacrificed himself to become the Avatar of Akatosh and then the Statue of Akatosh that exists as a permanent substitute for the Dragonfires. Remember that no Daedric Prince could manifest while the fires burned, hence why Mehrunes Dagon needed to kill the emperor and take away the Amulet of Kings long enough to break through into Mundus. Yet Nocturnal does so on a whim - in her own temple of course, in a place where her artifact is held, but she still does it.