So there's no canon info on who they are or represent politically? Are they the nobles of Talabheim? The head of the local church? Generals appointed by another political entity?
A mix of the above?
There is a section on them in the book, I just quoted the most relevant portions to answer your question. This is part of the selection process:
"To become a Hunter Lord, one must not only prove martial prowess and political savvy but also prove skill as a hunter by tracking down and killing a dangerous creature of the forest. Targets include bears, lynxes, or wild boars. The animal skin is worn as a drape and is a symbol of honour once blessed by the Priests of Taal."
You need to show martial prowess, political savvy and hunt a dangerous creature. No notes on whether they have to be nobles, priests or anything, although I imagine some of that might help. The Parliament is another group dedicated to the legislature and administration of Talabheim, and that group is composed entirely of the most influential people, typically noble families but Merchant Lords and Land Owners in general can join. High ranking priests can sway the vote but cannot vote themselves. There's a bunch of groups dedicated to different aspects of Talabheim.
I think she's pretty conservative (in this aspect) even compared to the standards of the wider Empire. Or at least when compared to the standards of the Human company she usually shares.
I vaguely recall that Stirland (commoners?) are more prude than average, though I don't remember where from. The Jade, Bright, Amber, Gold and Amethyst Orders also probably have less of a culture of being embarrassed by nudity than the other three (though the latter two for very different reasons than the first three). Hell, I wouldn't be surprised if the Grey College actually subtly encourages some of the pre-existing prudishness. Not only is the Order not a fan of their Magisters having children, confusing feelings about sexuality are probably also conductive to Ulgu without sabotaging operational ability.
Stirlanders are generally described as backwards, insular and rural people who are incredibly close minded, xenophobic and stuck to their ways. They also have an obsession with lineage. But apparently they make up for that by being loyal and steadfast when needed.
I do want to say though. You might be asking too many questions of Boney, some of which aren't exactly necessary. Asking questions is fine and all, but I counted eleven questions in your post, and those were the ones directed towards Boney. You might want to slow down a little.