Lemmy Koopa is a boss in New Super Mario Bros. Wii. He is one of Bowser's eight children. Lemmy is the second oldest of the Koopalings. Although Bowser Jr. is the youngest of Bowser's eight children, Lemmy is smaller than Bowser Jr. He has a liking for circus balls, and even uses them in battle, and in the castle itself. Lemmy is the boss of World 3 (NSMB Wii). During the battle with Lemmy, you must be careful, because in both the castle and fortress the floors are icy. Lemmy shows a shocked appearance in the fortress, but backflips onto his circus ball ready to fight. He creates 3 circus balls that push Mario away as they bounce. He also creates magic from his magic scepter. Circus Balls do not hurt Mario, however. By jumping on his head three times, Lemmy is defeated. He goes to the castle. Meeting him there, causes Kamek to appear spraying his magic. Larry's circus ball is increased in size. Lemmy, once again, tries to push Mario off into the pit, with his circus balls. To reach Lemmy, you must jump and bounce on the balls, to hit him. After 2 hits, Lemmy's ball gets bigger. However, bouncing on a ball can still reach him. When you hit Lemmy again, he is defeated. A key appears unlocking World 4 (NSMB Wii) and the Airship of World 4. Lemmy survived the battle. In the ending cutscene, he appears with other Koopalings, helping Bowser get up. However, the castle falls on him. Be careful, Lemmy will try to ram and push you into the pit.
Lemmy has a yellow skin tone like his brothers. He has a pink snout and a green head. He has small but pointed white claws on his hands and feet. He has a multicolored hair and two oval eyes. He has a spiked orange shell on his back. He wears spiked metal cuffs on his arms. He also has a three-ribbed padded stomach and padded feet.