A little more work on your part would go far. Please list the twelve categories. My Kant CPR fell apart years ago - I do not have a copy to hand. As I recall, the twelve were very close to the Aristotelian categories of substance, action, passion, position, place, possession, quantity, quality, relation, time. But these, in this listing, are ten. Now you, what are the twelve.

Of the Aristotelian accidents, I'd say all three, usefulness, being interesting, and being nice, are qualities.