A is for... Aztecs in Atomic Armour Attacking Anomolous Amphibians

The A-Z fun begins! Here is our first letter:

This was kind of a conglomeration of suggestions from James Turner (via the Neill's A-Z of Awesomeness Facebook group) and Matthew Allen Smith (via twitter).

I think I know what B is going to be, but suggestions are now being actively welcomed for what I should draw for C and D...