From the Super Mario Wiki
A Koopa Striker is a species of Koopa Troopa introduced in Super Paper Mario. A Koopa Striker has large, orange eyebrows, wears a soccer uniform and has a black and white checkered shell, with the color scheme of a soccer ball. Its name may refer to the striker position used in soccer.
Koopa Strikers attack by placing a shell on the ground, then kicking it at any and all assailants. They guard the area around Bowser's Castle in The Bitlands along with other Koopas, and appear in the Flipside Pit of 100 Trials. A Koopa Striker is also seen in the minigame Hammer Whacker; he launches giant shells at Mario, Peach, Bowser, or Luigi.
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