Anybody got any personal theories as to who he is?
Here's mine:
He's just actually a kindly old dunmer who produces all the sweetrolls in Skyrim for good boys and girls. The reason he lives in a remote cottage is to avoid his innumerable fans. When you enter his house however, having just escaped 5 fans enter his bedroom through the window, another 3 enter through the kitchen window and one arriving naked posing as a courier he's in a bit of a bad mood.
Still, he is brewing a new radical sweetroll recipe at his alchemy table which should taste even better than before, in fact, he is almost certain that it will start peace between the Stormcloaks and Empire because they will both appreciate the deliciousness of the new sweetroll that they will forget what they are fighting about.
Sadly, he spills some frostbite venom all over his prototype, which causes the recipe to melt and produces toxic gases, rendering him highly aggressive.
When you enter his house, he is under the effect of the pastry poison, and attacks you in a rabid frenzy.