I have an air fryer and love it!
It's best for foods we don't eat anymore, though!
That said, halloumi, cheese on toast (mine's the flat kind of air fryer), chicken wrapped in lean bacon are all good.
Chips aren't bad, in a non chip kind of way.
Chargrilled veg are great- courgette, aubergine etc.
Sweet potato fries!
Trying to think what else I do in mine. It's basically a mini oven.