Another idea that sprang to my mind today for Kael + Team if the Doviello really should the blandness of them for the sake of helping beginners:
Give them a trait called "hunter-gatherer" (or something simmilar):
it whould do two things:
first make them always able to draft units (not just beastman, real draft. So better units appear if they get better tech
) in their cities size 3 + independently of any civics and right from the start representing the mobileness and agressiveness of their pop. (no resettling as pop though if its to be kept simple.)
(On a different note: the limit for drafting at 6 pop for drafting seems way to high to me even for military state. You should consider lowering it to 5 or even as low as 4. That might make that civic alot more viable for both players and AI. Naturally you should fix the support issue as well if that has not allready been done.)
(that might make it necessary to give them additional free unit-support as well so they don't outright drown in upkeep...)
secondly (the more important part imo) give each of their cities an additional starting yield of 2/2/2 (to represent their ableness as hunters and their ability to survive with meager support) in form of a tile yield bonus on city-tiles or a starting-building in each city or implemented in another way. (Which whould lead to a tile city-tile-yield of 4/3/3 + specials to commerce and hammers so a small growth is virtually guaranteed even in Tundra. Nothing to extreme. Just enough to utilize their drafting in an appropriate manner...)
Perhaps add an additional 2/2/2 bonus to their palace if that plays out as to weak (but i doubt it...).
That way you whould have a simple mechanics that whould allow a uniqe advantage (stronger early swarm and fast recruitment of vast stacks) which is still easy to grasp and doesn't make them use tundra better than anyone else while still providing an incentive to push into better terrain and not disproportionally benefiting them in grasslands and other neat places.
Also an Icehouse (Smokehouse UB) for Doviello + Illians as suggested somewere here might be fun + appropriate... (or be just that 2/2/2 starting-building for Doviello...?)
If i guess rightly, all those changes should be very easy to code if and grasp and shouldn't give anything unusual in the way of concepts compared to a vanilla game (save their worldspell of course...).
Perhaps its to some use (even though i personaly whould still like a complete makeover far more of course...) even though if parts of this suggestion have surely been allready mentioned somewere here. (I hope not just the exact same one in which case i apologize
.)