Sorry ... me again. Cooper's Dark is Rising sequence had lots of examples, if I understand you correctly. The Drew children are all pretty normal, and stay that way. They are normal human foils to those who are chosen. Their humanity gives them strength, and also puts them at risk. But they are all central characters who have to consciously deal with the fact that they don't have those powers. Magic happens around them, and to them, but their roles are mostly reactive.

In that same vein, how would you categorise the children of this world in The Chronicles of Narnia (i.e., leaving out Narnians like Cor in The Horse and His Boy and Caspian)? I can see the argument for the Pevensies being chosen, but really, their coming is foretold more than that they are 'chosen' (unless you want to talk theology!). But if the Pevensies are, I think it's clear that Eustace is not, at least, not in Dawn Treader.