Goombas are a species of brown mushroom-like enemies that have appeared as a basic enemy in plenty of Super Mario games, as well as games outside of that series. They are not considered much of a threat, as they only tend to walk back and forth and nothing else, as well we being defeated by only a single stomp.
They used to ally themselves with the Mushroom Kingdom, but as time went on, they joined with Bowser's forces, the Koopa Troop. Of course, there are still friendly Goombas out there, as some live independently from the others. The Goomba's first, and only, playable appearance was in the Mario Baseball series, where they are considered balanced characters.
