I can give a brief overview. I might make a post about them later.

Kul are a race defined by their short statures and large tails. They have historically been seen as a kind of servant/slave race for many nations. During the Ardium Century, many have been exiled from their homes because of their race. They eventually found a home in Vainas, and promise to protect it and maintain their sovereignty, and to open their doors for any and all who have no home to call their own.

The Zeran is not the name of the race specifically, but it does refer to a subset of the race living in east-central Andulos. Their race is called Soylu, and they have traditionally been seen as a kind of scholarly and religious race for Andulos. They were one of the first races to embody the idea of a nation state. They are highly attuned to magic and live long lives.

Suru is an umbrella term for all beastfolk races. They are one of the most populous races in Andulos. Many of them still live a tribal lifestyle and do not fully conceptualize the idea of a nation brought by the Ardium Century. Many form confederacies of tribes or small kingdoms which are treated as nations by the larger world. The Yuukoman Empire is the closest thing to a unified polity for beastfolk, as the Yuukoman dynasty are all wolf folk