well in my real life mario serie the koopa troopas are still the number one troops af king koopa bowser sins they are the same mutated turtle specie but bowser is far more evolved trew the mutation makes sens sins he puted him self on the trone.all along the serie they will be the most comment enemies obeying bowser they wer just simple turtles before the mutation. i just changed the head for a cheap plastic dino and repainted the rest and gave him a bamboo sword to make as they still respect the nature jungle there mostly located in but that does not stop them to want world domination along there king Bowser.of course there are more then one kind of those koopas there are the red shell ones Para Troopa.