Mechakoopa
Mecha Koopas are another one of Bowser's minions. They are mechanical versions of Koopa Troopas, but they don't have shells on their backs. They get paralyzed for a short time when stepped on, so Mario can kick them around and pick them up and throw them. When they get thrown however, they don't get very far like regular Koopa shells do. Also, they are technically invincible unless you kick or throw their paralyzed form at an enemy because they always get unparalyzed after a few short moments.
They make a short appearance in Super Mario World, where they only appear in the last World. Also, the final boss of the game, Bowser, throws them off of his Koopa Clown Car, the hovering clown machine he occasionally can be seen riding in. You must throw them up so they hit Bowser's head. They are like a cross between a Koopa and a wind-up toy. They have a wind on their back and their appearances are quite comical. They walk in a rhythmical way and they must wind themselves up again from time to time. In Mario Party 5 you fight a group of them in the final battle. They walk around trying to hit you with their fiery breath. Jumping on them once will cause them to explode. But keep in mind that jumping on a Mecha Koopa that is about to breathe fire, flashing in red, will hurt you. In Mario Party 7 Mecha Koopas appear in the 1-player Bowser mini-game, Ring of Fire, where one Mecha Koopa took the key to freedom from Bowser's mini-game area and went into a hole, only to come back a second later with many other Mecha Koopas. The Mecha Koopas would then circle the character, who would have to stomp on the correct Mecha Koopa's head while they circle him/her before Bowser stomps on the character 30 seconds later. The Mecha Koopas have an attack pattern similar to Mario Party 5's here. Mecha Koopas have also made small cameo appearances in Mario Power Tennis and Mario Party Advance.
Mecha Koopas make a short appearance in Mario & Luigi: Superstar Saga in the final level. Organic versions of Mecha Koopas appeared in Mario Kart Super Circuit.
