I have a fryer and recently made 6 chicken drumsticks after coating them in my homemade shake/bake. I really like them, I live alone and have made chicken nuggets also which turned out very good.
I bake donuts and can not picture how to go about making them in the air fryer. You would need something for them to keep their shape. Am seeing new fryers that do everything, air fry, bake and whatever. But you are paying a lot more for those extra features.