There has been rampant speculation on who the woman in the pool and the girl behind Thor in the picture above are.
It seems we may finally be getting some answers on the girl in the pool. It was revealed as the film came out that there was actually no woman in the pool in the actual film. She was actually cut from the film. However, the scene is actually still somewhat important as it reveals some of what Thor's Subplot was supposed to be like in the film.
Avengers director Joss Whedon was being interviewed by Empire Film Podcast and revealed:
There was a 195-minute cut of this movie. The original scene was that Thor went to speak to the Norn and how it would work was that he’d go in the pool and the Norn possess him, basically, and Erik Selvig asks all the questions, and the Norn, speaking through Thor, give the answers. So Chris got to do something different, and he really threw himself into it, and he did a beautiful job, but it wasn’t well regarded by the test audiences and I feel it’s probably largely because it was a rough cut with no effects, but also because it’s something that in a Thor movie would work brilliantly, but in this movie is just a little too left of centre.
Basically, the woman in the pool would likely have been this Norn. From her Thor would have been possessed and revealed his visions on Ragnarok.
What is a Norn?
In Norse Mythology the Norns are principally 3 women who stand at the well of fate (Well of Uror) there they take care of the roots of Yggdrasil (the world tree) so that it does not rot. The Norns are heavily associated with fate, destiny, time and events.
There are other norns in Norse mythology who go about causing good and bad events to happen.
Given this information what do you think of the changed scene? Personally, I think the film would have made much more sense if they allowed Thor to meet the Norn and let this play out. It also would have explained what this pool actually was (the Well of Uror / Fate). The original scene would have also provided an interesting scene for Thor and Eric Selvig. Selvig purpose in the final scene never made sense to me, but in this original scene it would have been explained. Thor would have required a person to ask him question that knew a lot about Norse Mythology, and there is no better character in the MCU for this than Eric Selvig.
Old Ideas on who the girl in the pool is:
Joshua Murcray posted some pictures of the mystery woman in the Agents of SHIELD forum and asked if she could be Raina after her transformation. He also mentioned the Dora Milaje from Wakanda.
Ive read other ideas that include Inhumans, Alanteans, and Chitauri. I think I have settled upon a few ideas that are most likely.
1) A Wakandan Dora Milaje - these are the warrior maidens that protect the Black Panther and also form up a pool of eligible women for him to marry.2) Shurri - the younger sister of T'Challa (The Black Panther) who at one point became the Black Panther herself
3) A woman from a flashback. Many Avengers are said to experience flashbacks when they encounter the Scarlet Witch. Could this woman be part of someone's flashback?
If I had to choose I would say she is a Dora Milaje. Her shaved head, lithe figure, and the exotic cave location all point toward a Dora Milaje. If this is true then it is yet another hint that Black Panther could be in this movie. Everything Marvel has officially said is that the Panther is set to show up in Captain America 3. However, this movie is dripping wet with references to the Black Panther, just dripping wet.
Girl Behind Thor
There is also a female in similar garb behind Thor. I tend to think the girl behind Thor is Asgardian and not related to the girl in the pool.
The Origin of The Black Panther?
Part of me is thinking is that what we are getting in this movie is the first part of the origin story of T'Challa (The Black Panther). Ultron's attack on Wakanda could serve as the impetus for T'Challa to turn into a superhero to defend his nation. Wakanda seems to already be used/terrorized by the villain Klaw who shows up in the trailer. Now the Wakandans will see Hulk and a giant Robot rampage through their streets and Ultron attack them. This could be the moment where T'Challa says enough is a enough and his people need a hero. Maybe we don't see Black Panther, but maybe we see the reason why there is a Black Panther.
Avengers: Age of Ultron news and speculation