I'd have to pick Vaermina. Her idea of hating anything "Unnatural" sickens me, as most of the races in TES are not natural in their own birthright. (Dunmer are ash-born Chimer, Orcs are...something else, etc.)
Namira! And by unnatural, she's picking on things like the undead, vampires, were-creatures, and liches. Daedra don't count, wildlife nature isn't harmed, and mortals are fine. Dunmer, orsimer, and blah don't count. Just think of Namira as Kynnareth's goth sister, who likes spiders, slugs, and otherwise ugly things, but is also a total nature girl. Also, Vaermina is the prince of nightmares