I'd like to start with the Khajiiti view of Namira.
http://www.imperial-library.info/content/words-clan-mother-ahnissi-her-favored-daughter
Here we see the Khajiit equate her with what appears to be the void. This makes her especially unique, as she was not birthed by Fadomai like the other et'Ada. Assuming this interpretation is accurate, I can't help but wonder what Namira's relationship is to the Ur-dra. Is it just me, or does it not sound like Namira's identity here predates all other Daedra?
But anyways, the Khajiit also seem to hold Namira responsible for Lorkhan's corruption.
And that's not all...
http://www.imperial-library.info/content/litter-mates-darkness
So it seems that Namira is the corrupting force behind the Heart of Lorkhan. How interesting. But enough about the Khajiit, let's go over a few others, specifically the Daedra.
http://www.imperial-library.info/content/spirit-daedra
It appears the Daedra also believe in a capital 'D' Darkness, and fear it. This falls in line with the Khajiit's beliefs, viewing the Darkness as the void. This has interesting implications for Namira, since we know the Daedra do not die in the usual sense. Is it possible that Namira is responsible for Daedric souls? Unlike mortals, the Daedra retain all memories after rebirth, so I can only imagine the experience for them is truly terrifying. After all, Namira isn't known for her pleasantries. And before I go on, the two above sources are not the only ones that associate Namira with the capital 'D' Darkness.
http://www.imperial-library.info/content/book-daedra
There's been a lot of discussion about where the Forsworn learned their Briarheart ritual, with many of us, including myself, believing it was Malacath due to his association with heart removal, and the entry in PGE1 stating that the Reachmen learned much of their magic from mountain Orcs. I believe now, however, the ritual comes from Namira.
http://www.imperial-library.info/content/life-barbaric-and-brutal
If Namira is behind creating spirits of vengeance through heart removal, it certainly calls into question Trinimac's resurrection. According to Mauloch, Orc-Father, Trinimac was so enraged by what Mephala and Boethiah had done, that he cut open his own chest and tore out his own heart, allowing him to resurrect himself into Malacath. Did Trinimac unwittingly invite Namira's essence into his own spirit? What's interesting is that Namira's name is an anagram of Ariman. Who's Ariman? Well, if you've been doing your homework on Mithraism, then you'd know that Ariman, or Ahriman, is the primordial spirit of evil, darkness, chaos, and death, and the eternal enemy of Ahura Mazda and Mithras. I don't think it's any coincidence that Namira's name and role are awfully similar to Ahriman's, especially when considering the comparison made between Trinimac and Mithras by MK himself.
Notice in the passage the mention of an "Ever-Oozing Altar". It doesn't seem like much at first, but there might be more to it.
http://www.imperial-library.info/content/ooze-fable
This "Ooze" seems to be a hell of sorts for the Bosmer, much like how the Khajiit view Namira's domain. If Namira is connected to this "Ooze", then I can't help but wonder if those Bosmer who undergo the Wild Hunt go to her realm when they self-cannibalize. It's no wonder the Daedra hate the Darkness. It's full of terrifying, all-devouring demons!
That's it for now. I'll try to add more to it, if I can. Hopefully this thread can help breathe some much-needed life back into this board.