He is an obese, green-skinned bass who wears an orange tank top, brown pants, and black glasses. His lips and other parts of his body are dark green while his stomach is a lighter green. He has a bit of speech impediment and breathes very deeply. In "Fools in April" however, his skin was brown, tank top was white, and pants were blue.
When SpongeBob finds out he forgot to put pickles in Bubble Bass' Krabby Patty in the episode "Pickles," he goes into a state of shock, and takes time off of work, claiming he has forgotten how to make Krabby Patties altogether.
However, SpongeBob later achieves his confidence back and resumes his role as fry cook when Bubble Bass returns once again. Again, he orders a Krabby Patty from SpongeBob with pickles, which SpongeBob delivers, only to hear Bubble Bass claim that there are no pickles yet again. However, SpongeBob realizes that Bubble Bass had been hiding the pickles underneath his tongue the entire time from both Krabby Patties to avoid paying. At the mercy of the angry customers, Bubble Bass escapes before they can punish him for his deceit. He also had a woman's car keys under his tongue.
Bubble Bass makes a minor appearance in "F.U.N.," where he "accidentally" sits on Plankton, and digs himself deeper into the seat when SpongeBob tells him what he'd done with an evil smile, and later confused Plankton for a jellybean and chases him about his hand when he starts running.
Bubble Bass also made a cameo appearance in "Fools in April." He was shown when SpongeBob got tricked by Squidward and ran into his butt and made a large square indent. Though, instead of Bubble Bass being a green color he was brown (gray).
Bubble Bass appears briefly in Plankton's Good Eye, he fell out of a window (his house was burning) and crushed Plankton again. He was also there when SpongeBob gave Plankton the "Great Big Hug."
In the first level SpongeBob and Beautiful Gorgeous travel to Bikini Bottom where they find Bubble Bass eating Krabby Patties right before he gets transformed into a giant minion of the Morphoids. Bubble Bass later heads to the Krusty Krab forcing SpongeBob and Beautiful Gorgeous to follow. They arrive to the Chum Bucket and rescue Gary. Jimmy and Plankton later arrive to the theater to only find Patrick and Squidward trapped. SpongeBob and Traloc later arrive at the Krusty Krab and fight a monstrous-sized Bubble Bass who demands more and more Krabby Patties. Finally he is defeated returning Bikini Bottom normal once more.
Bubble Bass is briefly seen on the Bass Vegas sign.
Judging from how Bubble Bass and SpongeBob looked and talked to each other and when Bubble Bass was crushing Plankton (when SpongeBob's friend), it is evident that SpongeBob and Bubble Bass shared something of a rivalry long ago.
Bubble Bass makes an appearance in the video game SpongeBob SquarePants featuring Nicktoons: Globs of Doom, and Lights, Camera, Pants!
Bubble Bass didn't appear for many years after the first season, until he was seen in the episode "Plankton's Good Eye." He was seen in a fire and running out of the Chum Bucket with Larry, Sandy, SpongeBob and Nat.
For reasons unknown, in "Plankton's Good Eye," Bubble Bass' voice is higher pitched. He also seems kinder and friendlier in the new portrayal.
He hides numerous things under his tongue, such as pickles and a woman's car keys.