Heroes 6 - Discussion

But it’s unlikely they’ll make a Naga race; more likely, it will be a unit in an army, nothing more.

Three or four units (warrior, archer, mage, and some other outlandish unit) and a hero. You can call it a race and be happy. The Dwarves were made on this principle, and that’s fine. Although, with Nagas, you could add various creatures, like my favorite manticores, for example.