No. (spoiler) she will leave at the end of the game though
Nowhere. The only DLC that features Morrigan is "Witch Hunt".
Yes, you can romance Morrigan if you pick the right dialogue options.
At this time, No. But the game developers have hinted she may return in a future expansion/DLC. Awakening perhaps?
Nothing. You can get her real Grimoire through peaceful means, you can tell Morrigan you killed her, and she doesn't get another mention in-game.
no the only characters from origins you will see are wynne ohgren and Alistair/AnoraLogain (Alistair Anora and Logain all depend on your actions in origins)
Yes, because Awakenings is an expansion to Origins
Yes.
Dragon Age: Awakening is an expansion campaign to Dragon Age: Origins. The data on the disk is just the info needed for the new campaign, however it cannot be used without the game 'framework' provided when you installed Dragon Age Origins.
A little. In Dragon Age: Origins, one female demon briefly shows her breasts. There is no nudity after that, though.Source: http://www.commonsensemedia.org/game-reviews/dragon-age-origins
Yes, the ultimate edition of DAO includes: Dragon age Origins, the expansion game Dragon Age - Awakening, and all eight DLCs.
You have to go through the story befriending Morrigan, then you go to camp and ask her if she can teach someone else to be a Shapechanger. Follow the prompts and you now have that specialization!
There is an item called Black Grimmoire (I believe) that you find in the mage tower. It can be given as a gift to Morrigan and that should activate the quest.