I'll just give examples from my campaign, as I've used them all in one form or another.
Beysibians, they're a culture of snake-worshippers (Zehir being their god). Switched fire resistance to poison resist (story being they're constantly ritually-bit by snakes until they're virtually immune). Historically, the Beysibians were always a major thorn in the side of the Rankan empire, only more recently becoming a massive threat.
Sset, the kingdom of the Beysibians was once home to the children of Zehir, also known as the Yuan-ti. When the Lightbringers fought back the Beysibian army, they used a powerful and ancient ritual to banish the Yuan-ti and bind them in Zehir's realm. Sset slowly crumbled under poverty and lack of leadership. It is now ruins in the desert.
3. Genasi. Particularly fire genasi.
Flameborn; As with the other primals, Carrok the Firebird has his own gifted children. His flameborn are gifted with the fiery touch and actively protect the elemental spirits of fire.
woodhelven; Lairlaif, the wood guardian calls lost children to his grove. Those who answer are spared death by the denizens of the wild. They are instructed in the protecting the forest and her kin. In accepting this call, they become more feral, able to traverse the wilds without alerting the more dangerous creatures. It is the duty of every woodhelven to usher trespassers out of the woods, but protect them, and treat destroyers of the wild with extreme predjudice.
Hope that helps.