Koopa

Koopas are the main foot soldiers of the Koopa Troop. They first appeared in World 1-1 in Super Mario Bros. There are four shell colors of Koopas: Green, Red, Blue, and Gold. In platform games, the green Koopas would walk off cliffs and red ones do not. The blue and gold koopas were faster than the others, and the gold koopas ran towards the player.