Also known as: カロン(マリオシリーズ), カロン
Skeletal versions of Koopa Troopas, found mainly in Towers and Castles. They first appeared in Super Mario Bros. 3 and have since become a staple of the Mario series.
They often collapse into a pile of Bones when attacked, but they will quickly recover and return to normal.
Their Japanese name is "Karon".