|Kind of Item||Koopa Shell|
|First Appearance||Super Mario Bros.|
|Lock on to the nearest kart in front of the user.|
A Red Shell is a red-colored Koopa Troopa Shell. They are worn by less common Koopas, which won't walk off cliffs and are as well weapons in the Mario Kart series. When stomping a Red Koopa, it will or hide in its shell or will be kicked out its shell. In both ways, the Red Shell could be used anyway. Normally, in sidescrollers it just acts like a Green Shell, but in spinoffs, it has a homing effect. It sometimes is eventually harsher than a Green Shell.
Mario Kart series
Red Shells appear as staple items in the Mario Kart series, appearing in almost every installment - canon or fanon - and usually functions in the same way. Once thrown, Red Shells tend to lock on to the racer ahead of the thrower, and will target them. They are unable to bounce off of walls in most installments.
The Red Shell reappears in the Mario & Luigi series as a returning Bros. Attack, once again under the name 3D Red Shell, and being one of Mario's Bros. Attack, which uses up 2 Bros. Points. It is obtained by a Blue Toad with a sack in Toad Town, who gives Mario and Luigi all 10 Attack Pieces before they leave the area. It acts similar to how it did in previous installments, though the amount of hits is the same as in Mario & Luigi: Paper Jam.