Remember that it is a buffet so everyone can get food from all the stations.
That said, one station had traditional Disney kid fare including chicken nuggets, pizza, and mac-n-cheese.
At the carving station, at least one meat was unseasoned/sauce on the side, so that would work. There were several fairly basic rice/couscous dishes that would likely work too. There is a plain lettuce salad with both 'standard' and 'exotic' dressing choices on the side. There are 3-4 soups and 1 always seems to be pretty basic (veggie, cream of mushroom, etc). Plain bread/rolls. And, of course, a big dessert table that includes the normal cookies and brownies as well as the fancy stuff.