Octoomba

Octoombas, also known as Electrogoombas, are alien Goombas that inhabit space. They're certainly related to Goombas, even if it might be a little hard to tell just from looking at them. The shape is about the same, after all. But they do look pretty weird. Almost like a cross between a Goomba and something else?

On an unrelated note, their mouths look like a perfect shape for rocks to fit through them. Maybe it's just me.