Yeah, the Chimer were basically renegade Aldmer, until cursed by Azura. I suppose the resemblance to Daedric races may be due to some hybridization from this change, but I will point out the height differences. The Dunmer are no more Daedric than the other Accursed Mer, the Orcs.
The Dremora, incidentally, are just Daedra allied with Mehrunes Dagon much as the Atronachs are associated with Elements. I assume (without much more to go on) that most Daedra look like them in Oblivion, but Dagon is the only one who regularly summons them to the plane of Nirn to do His dirty work (other than Expert Conjurers) The other Daedric Princes generally work through mortals, or magical effects from their own planes, and Artifacts. For instance, Malacath has His Orcs, and annexed the Dwemer artifact Volendrung (The Hammer in Hammerfell.) Hircine uses the "Gift" of Lycanthropy, and Boethea the Ebony Mail...