There are several acceptable items: Basil, rapini, anchovies, mozzarella, sausage, artichokes, capers, small artichokes, eggplant, prosciutto, things of that sort. Never pineapple, other fruits, or the strange things you find on American pizza!
Interesting....sausage like Italian sausage here? Prosciutto di Parma is expensive (and was once illegal to import); I’d save it for melon balls. Anchovies...when I was younger my favorite toppings were onions & anchovies; people would leave the room when I mentioned that.
And not too much mozzarella, I imagine. How about pecorino?
But the magic is the crust. Has anyone posted here the right kind of flour for a Neapolitan pizza?
As for fruit on pizza? No way. That’s like these fruit flavored salad dressings.