Beach Koopa

A Beach Koopa is a Koopa Troopa that has lost its shell and wears nothing more than an undershirt (and/or in some cases, boxer shorts), first appearing in Super Mario World. In their original appearance, Beach Koopas appear small and hunched over, but were later depicted as being able to walk around like normal, shell-wearing Koopa Troopas. Other species of Koopas are also referred to as "Beach Koopas" when they lose their shells.

''Mario Bros.
While technically not Beach Koopas, in the original arcade version of Mario Bros., if the Shellcreepers are left alone not attacked while they are upside down, they will pop out from their shells to flip back their shells. When this happen, they highly resembling the post-appearance Beach Koopas, wearing a white shirt and shorts.

''Super Mario World
When first knocked out of its shell, the Beach Koopa is extremely vulnerable. If given enough time, it will right itself and pace forwards in search of a new shell. Green and Red Beach Koopas will become the color of the shell they enter. Once they enter a shell, the Yellow variety will become a Kamikaze Koopa: the shell will flash rainbow colours and spin around after Mario. Blue Beach Koopas, will kick any shell they come into contact with even if it is moving; they will also kick disabled Goombas, Bob-ombs, and Buzzy Beetle shells in their way. If two Beach Koopas enter the same shell simultaneously, they will become only one Koopa Troopa. Any Super Koopa who wields a flashing cape will revert to a Beach Koopa after being stomped on and relinquishing its feather. Some Beach Koopas will perform a Slope Slide attack against Mario.

''Super Mario 64
In Super Mario 64 and Super Mario 64 DS, Mario or others could jump on a Koopa Troopa to knock its shell away, transforming the turtle into a Beach Koopa. If attacked again, the Beach Koopa would be destroyed and a Blue Coin would pop out. If not defeated, the Beach Koopa will frantically attempt to dive back into its shell. Mario can ride on this green shell.

''Super Mario Sunshine
In Super Mario Sunshine, Electro-Koopas become Beach Koopas for a short time when they throw their shell at Mario. If he manages to jump on the Koopa or squirts it with water, so it is electified by its own shell, it will be defeated. These Koopas have pink boxer shorts.

Paper Mario
Beach Koopas make a brief appearance in Paper Mario appearing in Koopa Village after the Fuzzies stole the local Koopa Troopas Shells.

Super Mario World television series
In the Super Mario World episode "Fire Sale", the silent, Koopa Troopa henchmen of Kootie Pie Koopa is continually knocked out of his shell, becoming a Beach Koopa, in the episode, usually during one of Kootie Pie's violent temper-tantrums.

''Mario is Missing!
Even Bowser has a "Beach Koopa form" (wearing spotted boxer shorts) when separated from his shell, as shown in the PC version of Mario is Missing!.

Yoshi series
Beach Koopas were also found in Super Mario World 2: Yoshi's Island and Yoshi's Island DS, although here, they walked upright when evicted from their shells, instead becoming small and hunched over, as in Super Mario World.

''Super Princess Peach
Beach Koopas reappear in Super Princess Peach, looking like they do in the Yoshi sidescrollers.