Calzones, meat pies, focaccia, and any of the various flatbreads with toppings from cultures around the world. A meat and cheese quesadilla with salsa on top is essentially a thin crust pizza before it's folded.
Spanish omelette with chorizzo
Controversial to some, but you can put the tomato mixture, melted cheese and pepperoni on pretty much any other unsweetened carbohydrate base, and it's nice, and should give you most of that "pepperoni pizza" feeling.
For example, bread, toast, pitta bread, potato cake, potato waffle, pancake, Yorkshire Pudding, pasta, roast potato, baked potato, chips (fries), crisps (chips), noodles, rice etc
Pizza tortillas got me through my 20s.
Pepperoni sandwich, warm with melting cheese
Sun-dried tomatoes give a pepperoni-like zing
