Koopa Troopas (commonly shortened to Koopas or sometimes Troopas) are anthropomorphic turtles with removable shells that come in many different colors, with green and red Koopa Troopas being the most common; green Koopa Troopas usually walk in a straight line until they hit a wall or fall into a bottomless pit, while red Koopa Troopas walk back and forth without walking off of the platforms they are on. Koopa Troopas are the most common members of the Koopa species. Most serve as foot soldiers belonging to Bowser's Minions, being the second most common enemy encountered by Mario behind the Goombas. As revealed in Super Mario 64, however, not all Koopa Troopas work for Bowser (or any other villain), some of whom even act as allies to Mario during his adventures, and have appeared as playable characters in various spin-off games starting with Super Mario Kart. They are notable for the many uses of their shells in the Super Mario.
