Top 5 pizza toppings
1. Anchovies
2. Sundried tomatoes, or less ideally, cherry tomatoes
3. Pepperoni
4. Chillies, preferably chunky
5. Feta cheese
I'm not claiming that these five ingredients make the ultimate pizza, but that when on the correct pizza the listed ingredients particularly shine, or bat above their average.
I have omitted mozzarella because that goes on basically every pizza and is obviously #1.