Super Mario: Mecha Koopa - 6" PlushMecha Koopas (sometimes spelled Mechakoopas), also called Windup Koopas in the New Super Mario Bros. Wii game guide, are one of Bowser's many minions. They are small mechanical versions of Bowser himself, resembling a wind up toy. They have a wind up key on their back and their appearances feature several mechanical appendages. They walk in a rhythmical way and must wind themselves up again from time to time in order to keep moving.