(Certainly I have never been that kind of person who understands the point or cares about Power Levels, Strength etc. I've always found more interesting the character itself and their story/development rather than "what can they do/ at what level they're" , so there's nothing I have to discuss about that)
And to be honest, I dont even think we will ever get the chance to see all their kids' abilities. There are too much of them, so it's fine for the author to only focus on a couple of them at most during this arc.
We already know Tioreh's beasts, but we have to see if the beasts' abilities showed in 7DS: Origin are the same for the manga (for example, Tioreh's Fox has healing abilities; and her Lion is literallly Escanor with pink fire, full action-beast).
We also see in Origin that she can open portals to summon the Sacred Tree's branches (the game may differ from the sequel, but since it's confirmed Nakaba designed all her abilities, everything, then I have to assume all that is canon).
For the rest, I will just guess that the "fairy" looking kids will have common fairy abilities, and all "giant" looking kids will have Creation, the common magic for Giants.
I dont think Nakaba will develop them more.
Although, if there's a certain kid I am curious about, it's this one. Looks very mysterious and quiet comparing others.