nr42 wrote:But that raises an important question: how would they fare against actual grownup magicians ? Except for Tatsuya, of course. For example, Miyuki,Mayumi,Mari or Katsuto against Maya or Koichi or other heads of the Ten Families.
Of course we cannot know for sure, since outside of one brief and not terribly serious conflict between Tatsuya and Maya, none of these characters have faced off against their elders. That being said, it was either outright stated or at least strongly implied at one point (sorry, I forget where, but it probably would have been volume 8 or later) that each successive generation is, as a whole, stronger than the one before. This means that the best of the younger generation have more potential than the best of the older generation. So we should assume that, eventually, the children will be able to best their parents.
Of course, the older generation are presumably more experienced, so it's hard to make a direct comparison, to say nothing of the rock-paper-sissors effect that seems to be in play here when people from different families fight. Long story short, we don't have enough information on the older generation's capabilities to make an educated guess that goes farther than
1) Tatsuya and Miyuki would probably win in a one-on-one battle against any of the adults.
2) Maya would probably best any of the other children.
3) The more experienced/talented of the children (Mayumi, Katsuto) should be able to beat their own parents, or at least give them a good run for their money.