I've not had the pleasure of playing with Nebarra in my load order, but from what I've seen and read, it seems like he is an Altmer veteran (with ties to the Thalmor?) Her first reaction to someone affiliated with the Thalmor is open hostility and possibly a murder attempt, so the DB would have to first convince her to put her weapon away. Past that, I think she'd be quite amused by Nebarra's company. He's quite a cynical, surly guy who doesn't spare anyone's feelings, and Auri's response to that kind of personality would be to either try and make him laugh (like with Kaidan) or to poke poke poke for a bigger reaction (more likely with Nebarra.) I think she'd enjoy the verbal sparring and mischief and perhaps even warm up to him, depending a little on his reaction to her. Auri isn't easily offended at all so his surlyness wouldn't be an issue for her.

Dreamfeather is a descendant of the founder of DreamClan. The prefix 'Dream' was given to him by his mother, Sheepswirl, of which is a granddaughter of the original Dreamstar. Dreamfeather outright refuses to take on the role of leader, having been deputy under two different leaders, as he continuously gives what should be his position of leader to another cat whom he trusts.