First off, you did some slight misclassification.
With Anu, it's best to say he's "IS" and his opposite is Padomay, who is "IS NOT." One is to affirm, the other is to deny that affirmation. It's the Godhead's mind splitting in two when IS was responded with IS NOT. You could also go with infinity with Anu and 0 with Padomay.
The two then had their souls come into form, being Anuel for Anu, and Sithis for Padomay. With these two, it ends up being Stasis and Chaos, or could say pure potential energy and the other being pure kinetic energy. From there we gain the god of time, known as Auriel/Akatosh/Alduin, coming from Anuel, and the god of space, known as Lorkhan/Shezarr/Shor, coming from Sithis. The god of time brings order, with the god of space bringing limit.
Now, as for cultures, some see Sithis as the original push, the one who got the ball rolling from the stasis. With the Dark Brotherhood and Morag Tong, they celebrate limit through death, and actually seem to worship Lorkhan in the guise of Sithis (see the Vile Lair's statue, which looks like a grim reaper without a heart. Missing heart is like Lorkhan, whose heart was removed, no?)
Now, with whose good and bad does depend on which culture you are looking at. With the nords, they see Shor, his shield thanes, and his battle wives as being good. With the mer, they see Lorkhan as being evil and malevolent because he sought to limit everyone and reduce the et'Ada from being cool, awesome, and powerful gods into weak, pathetic, and flawed mortals. With the Cyrodiilic religion of the 9, it's heresy.
Also to add, ignore all classifications done by the mer, as it tends to be very confusing, convoluted, and ethnocentric. In reality, all et'Ada, including the aedra, daedra, magna-ge, and mortals, are combinations of Anu and Padomay, though the amount does vary.
Lastly, for all intents and purposes, view Sithis, Anuel, Padomay, and Anu as forces, instead of sentient beings.
That should be the short. If you got any specific questions, I and most of everyone that frequents here, should be able to answer your questions with more detail. Also, it'd help the reading if you split your paragraph of death a bit.