Koopa Troopa

Koopa Troopas (, Nokonoko) are enemies from the series.

Origin
Koopa Troopas made their debut in Super Mario Bros. as a common enemy, and has become a common enemy in later Mario games. Along with the Goombas, the Koopa Troopas are some of the most recognizable enemies of the Mario series. They are anthropomorphic turtle-like creatures that are commonly seen in their green and red variations. The green Koopa Troopas are mostly known for walking in one direction until they are defeated or they fall, while the red Koopa Troopas move back and forth on platforms and turn around at ledges.

Koopa Troopas are known for damaging the player on contact. If a Koopa Troopa is jumped on, they retreat into their shells rather than be defeated altogether, which can be kicked as projectiles. If the shells are left out for too long, however, the Koopa Troopa can emerge out of its shell. The kicked shells can also pose a danger if they bounce off of a wall.

In  and in later games onward, if a Koopa Troopa is jumped on and retreats into its shell, it can be picked up, carried around. This, however, can be dangerous, as the Koopa Troopa can emerge out of the shell while carried and can damage the player holding the shell. In Super Mario World and in later games onward, the Koopa Troopas appear walking on two legs instead of four.

Prominent members of the Koopa Troopa race include, one of Mario's party members in .

The Koopa Troopas feature a winged version: Koopa Paratroopa.

As a background character
Two Green Koopa Troopas appear with custom sprites, styled after their 8-bit forms as background characters in the stage.

As a background character
Two Green Koopa Troopas appear in their 8-bit forms as background characters in the stage.

As an enemy
Introduced during E3 2001, Koopa Troopas appear as a common enemy in the Mushroom Kingdom stage of Adventure Mode.

Koopa Troopas walk back and forth, turn around at ledges, and hurt the player on contact. Dealing enough damage by attacking them or jumping on them forces them to retreat into their shells. If the shell is left alone or carried for too long, then the Koopa Troopas will emerge out of their shells. Koopa Troopas can be defeated by grabbing and throwing the Koopa Troopa inside its shell, or by knocking it off a ledge, which will result in a Koopa KO bonus where the player receives 200 points for each Koopa Troopa KO'd.

Green Koopa Troopa shells can be grabbed, carried around, and thrown like the Green Shell item to KO other enemies or damage opponents. Red Koopa Troopa shells also function similarly to the green variation, but deals fire damage and stronger damage and knockback upon contact.

As an enemy
Koopa Troopas appear as enemies. The green and red versions appear as ground enemies in stages where Bowser's minions are present. Similar to their Melee counterparts, the Koopa Troopas can retreat into their shells when damaged or jumped on; however, they cannot harm players on contact, but they attack with a leaping headbutt when close enough. Also, the Koopa Troopas can emerge from their shells, even while their shell is moving.

Trophies
The Koopa Troopa trophies can be obtained by using the Trophy Stand on the Green and Red Koopa Troopas in The Subspace Emissary.

As an enemy
The Koopa Troopas appear as enemies in Smash Run in, reprising their behavior from Brawl.

As a background character
In, Koopa Troopas appear as background characters in the Super Mario Maker stage riding a Lakitu cloud. Their appearance changes depending on the game style, matching their designs in Super Mario Bros., Super Mario Bros. 3, Super Mario World, and New Super Mario Bros. U.

Trophies
The Red Koopa Troopa trophy is exclusive to. The Green Koopa Troopa trophy appears in both versions. In, it is part of the Bowser's Minions.

As a background character
The Koopa Troopas in their 8-bit forms return as background characters in the returning stage. They have been updated to more accurately match their original sprites from Super Mario Bros. and are now wearing red shells.

Koopa Troopas also return as background characters in the returning Super Mario Maker stage.

Spirit
Koopa Troopa also appears as a Novice-class support spirit, and is featured on the spirit.

In both spirits' battles, Koopa Troopa uses a puppet fighter and features Green Shells as an item.

Koopa Troopa is fought on the Golden Plains stage, referencing their appearance in New Super Mario Bros. 2. During the battle, Squirtle's defense will increase, referencing how a Koopa Troopa retreats into its shell rather than be destroyed by getting stomped on.

During the Standard Kart spirit battle, Koopa Troopa uses an army of Squirtles and is fought on the Mario Circuit stage. During the battle, the Squirtle army will favor their Withdraw special, referencing how the Green Shells are used as an item in the Mario Kart series.