We know that Skyrim is set about 200 years after the events of Oblivion.
So its unlikely that, in the natural order of things, any of the NPCs in previous Elder Scrolls games could be brought back - Maiq the Liar is an exception to that, because he is an Easter Egg character and exists outside time, or so it seems
But if you could choose one super cool NPC and have them time warped into Skyrim then who would it be, and why?
And if you can come up with a good reason why they would 'fit' into Skyrim, then so much the better...
The Adoring Fan. I would love to see a return of that annoying little codependent bosmer.
How else am I going to test my Dragon Shouts effects?
Edit: Maybe have a little shrine to him showing he ended up achieving greatness. Or have his body found in a horrible death scene. I would like some little reminder of him atleast
Divayth Fyr.
If anybody could survive the eruption of Red Mountain and the invasion by the Black Marsh, it's this 4,000 year old Telvanni. I don't think he would fit into the game well, but perhaps having him lodged in a Dwemer ruin with his wives and Yagrum Bagarn. I'm excited for the new lore we are going to receive about the dwarves in this game, and there could be quests associated with this group in regards to the Dwemer.
All the vampires of of Oblivion have a chance at still being alive, except that the player kills most of them. I think Count Hassildor is the only one who doesn't die. It said on his UESPage that he is always essential, so he might be in Skyrim. It would be good to see at least 1 character come back.