Choomba

Choombas are a kind of giant, metallic, locomotive-type Goomba found in the game Mario & Luigi: Bowser's Inside Story. They have coal-black bodies, red eyes, yellow-glowing pupils and a chimney on the top of their heads. They are associated with Coal Ants, which will jump into a Choomba's head during battle to make it attack more. A Choomba will charge up its attack by walking back and shooting smoke out of it's head showing either a shell or a fist; the smoke will appear in a different pattern each time. The Choomba will then charge into Bowser, who needs to withdraw into his shell when Choomba jumps on him and needs to punch the Choomba when it runs into him.