Goomba

Goomba is a common recurring enemy coming from the  series. In Super Smash Flash, Goombas did not appear at all, with the winged, Super Mario World version of Flying Goomba appearing instead. For Super Smash Flash 2, Goombas were confirmed to appear in the Adventure mode stage,.

Character description
Goombas resemble brown mushrooms (or chestnuts, hence their Japanese name) with two feet, but no arms. Their design is based on a shiitake mushroom. Goombas have large faces that occupy most of their mushroom caps, while their stems attach their heads to their feet. Additionally, Goombas have black bushy eyebrows, which form a scowl, as well as two upward-pointing fangs.

Goombas are physically weak, and are not much of a threat to adventurers, as a single stomp usually defeats them.

In Super Smash Flash 2
Goombas were confirmed by the fourth Smash Flash DOJO!!! to appear in Super Smash Flash 2's Adventure mode. According to the DOJO, Goombas were supposed to appear in the mode's first level, Mushroom Kingdom, at every difficulty, attacking the player by touching them, and dying upon getting stomped on their head.