I once had roasted red peppers on pizza. It was pretty good, but it's not something I'd go out of my way for. I can't see liking green peppers on a pizza.
BTW, I voted anchovies. Had it once. ONCE.
Yeah, Anchovies are awesome in Caesar salad, not so much on pizza though.
Not a fan of anchovy fillets floating around in my salad, but anchovy paste in the Caesar dressing? Yes.