I looked up a few and i think you can see the Ability Scores in BG3 Wiki. At least of some of them.
This gave me pause. The ability scores of some NPCs are way over the top. Look up kahga or better, examine Gekh. Even if those are NPCs they should at least be somewhere near the possiblities the Races give. Having a lvl 5 Duergar with 18,18,16,14,14,12 or something like that would make him some kind of uber Dwarf.
Kagha is nearly the same.
While i do not think the battles too hard it still feels like an unfair advantage. I downloaded some mods to go that way and the battles got ridicoulously easy. I always hated having a games difficulty based sorely on enemy strenght. Nothing tactical about that.