Hah? It would make no sense ti import an OB character into Skyrim. You see... Skyrim happens 200 years after OB and if you play a human character... you should have died already for ****'s sake!
By rule, in every game you play a different person, not the person from the past game. True, you can imagine that your character is the same but I don't think many of us who are more hard-core fans would like the idea of playing the same person because it simply doesn't make sense and we don't mind making a different character every time.
Sure... The humans are dead.
I've played tons of characters, like anyone. But I do have this Dunmer Nerevarine that I decided was going to Cryodiil after the events of Morrowind so I just made him over again, with some tweeks here and there but otherwise I decided he was the same man. My backstory was that he had broken into the cell himself. It was the very same cell he had been in when the Emperor had ordered him shipped off to Vvardenfell and he had returned to reflect on all that had happened, when low and behold, the emperor returned! Sure. I don't get to keep all his old power but I roleplayed that too. It was a choice. He saw his second meeting with the Emperor as a chance to start over and he relenquished whatever magic he had, returning to a mortal form. Alas, when the Emporer was killed and he realized his destiny had been to help, he had to build himself up again. That very same Dunmer is in the Shatterlands right now. His rage will blind him for some time but I imagine that in two hundred years or so, He'll wake up in a prison cell, on trial for a murder he cannot remember commiting. Once again, he will have to start over. Build up his power and fufill his destiny.
Point is. It's a role playing game. OP, you want to port your character? Do it. Maybe he was injured or stripped of his power by an evil wizard. Come up with a reason why you are still you and go with it.