= <--- See that's how this going to work. My first few ideas I wanted to share are about the Raiders so I used the red "=" first.

When I said the raiders are like the gypsies of the Middle Ages, I was thinking less of a cultural similarity and more of how the gypsies back then we're kinda the homeless scum of Europe. They didn't have a homeland, they were mistrusted wherever they went, and in a lot of cases they resorted to thievery. I also envisioned them kinda like the Midianites in the book of Judges: swooping in, pillaging food, money, clothes, and livestock, and then destroying the remaining crops so as to leave their victims destitute and hard-pressed.
Combining those two essences, I see the Raiders as a race of marauders unwelcome in any kingdom. The larger kingdoms have strong enough militaries to keep the Raiders at bay, leaving the poor micro-kingdom vulnerable to them. Thus the Raiders, with nowhere else to go and mistrusted by all, make their camps in the wilderness borders of the micro-kingdom and raid the villages of the micro-kingdom.
My next thought was about their shapeshifting abilities. I think they all have the ability to change into more than one creature, but it takes time and effort. Basically, Raiders have to "learn" how to shift into a certain animal, which can take years of time and concentration. Thus, most common folk among the Raiders have only learned about three different forms on average and they pick them carefully according to their goals/roles in life. For instance, hunters would choose to focus on learning how to shift into predators and spies would focus on small creatures with keen senses so as to avoid detection easily. It's not uncommon, of course for Raider warriors to have learned 4 or 5 forms instead of the common three. In theory they
can learn how to shift into other people, but that is extremely difficult to learn and maybe even painful.
That's all I've got for the moment.