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Goombas
If you are looking for a bio something useless, you have come to right place. Goombas are probably one of the weakest of all of Mushroom World's monsters. Most of them you can just jump on top of their head and they disappear like magic, but there are some special ones (that are listed below). Well, anyways, all Goombas have a similar shape. They all have a brown mushroom shaped body with two feet. They also have two giant eyes, two giant eye brows, and two teeth. Two, too, to! Apparently, the Goombas used to be the main citizens of the Mushroom Kingdom until some Goomba decided they all should become their own civilization. Since they left, the Toads moved in. The Goombas now work for us (the Koopas), though they are really, really weak. I personally think Goombas are mined out of.... mines, but hey, what do I know.
Special Goombas
Paragoombas
Spiked Goombas
Paragoombas, unlike Parakoopas, can't actually fly. They sort of jump. You might think that they are a lot harder to jump on than regular old Goombas, but that isn't really true. You just have to wait for them to land and jump on them! However, when they are in groups, they are much harder to beat.
Spiked Goombas are much harder than regular Goombas since the old jump-on-the-head trick won't work anymore. Well, you can jump on their heads, but their spiked hats will get in the way. Who makes these hats, I don't know. Probably not the Goombas, considering they don't have hands.
Goombario
Goombario is one of those energetic goodie-two-shoes who followed Mario around. His grandpa gave him information on our minions, which he, I'm guessing, gave to Mario. He wears a stupid blue cap that makes him stick out like a sore thumb. Not only that, but he doesn't have sharp teeth. Ha ha ha ha!
Goombella
Goombella is another good Goomba who helped Mario along his way of an adventure. She seems to be Goombario girl-version replacement. I think she is a book-worm... or a book-goomba (ha ha ha) and uses her information to aid Mario along his way. Unlike regular Goombas; Goombella has pink skin, hair, and the power to hold things in mid-air (look at her book). She also wears clothing! Wow!
King Goomba
King Goomba is... the king of the Goombas (no really?!) He was created by King Dad (Bowser)  and boy, did he make him really, really big. King Goomba was supposed to destroy Mario and such, but of course it didn't work out as planned. King Goomba has 2 minions that are blue and red. Some call them the Goomba Bros. King Goomba wears a large crown and also needs to see an eye doctor!
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Music is "Goomba Village" by Dave Phaneuf

Thank you DinoThrasher for some of the information.