He is an obese, olive-green-skinned bass who wears a light orange tank top, orangish-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," his skin is mauve, his tank top is white, and his pants are 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 the latter 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 to amusing make SpongeBob look bad.
At the mercy of the angry customers, Bubble Bass escapes before they can punish him by calling the Cops on him for his crime, He immediately runs away like the coward he is just before he is arrested. 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 him deeper into the seat when SpongeBob tells him what he'd done with an evil smile. At the end of the episode, he confuses Plankton for a jelly bean and chases him about his hand when he starts running.
Bubble Bass also makes a cameo appearance in "Fools in April." He is shown when SpongeBob gets tricked by Squidward and runs into his butt and makes 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," when he falls out of a window as a result of his house burning and crushes Plankton again. He is also there when SpongeBob gives Plankton the "Great Big Hug."
Bubble Bass reappears in "Whirly Brains," where he is seen walking across the street while eating ice cream. However, as he is walking, the kid's Whirly Brain flies into his butt while SpongeBob and Patrick's Whirly Brains fly above him.
Bubble Bass also makes an appearance in "Bulletin Board," supporting "P-Star 7," claiming he is a "true hero for our troubled times." He also writes a message on the bulletin board under the name of "HandsomeLad42," and mocks SpongeBob after he receives an insulting message from P-Star7. Later in the episode, Bubble Bass himself gets an insulting message from P-Star7 and gets into a fight with Squidward.
Bubble Bass makes another appearance in "Larry the Floor Manager," where he is holding the line up in the Krusty Krab by ordering a large order, which causes Mr. Krabs to angrily shove a Krabby Patty into his mouth. Later in the epsiode, when the Krusty Krab is transformed into a gym, he squishes Squidward by accident while complaining about the Protein Power Shake's taste. Even later, he is seen eating sand when the camera pans to all the hungry customers. Near the episode's end, he helps SpongeBob and the other customers turn the Krusty Krab back to normal.
Bubble Bass is seen in "Krabby Patty Creature Feature" confronting a zombified Krabs at night not aware of his condition, thinks he is wearing a costume and eats the real pickles on his "fake" costume causing him to transform into the burger he ordered in "Pickles." He is later seen in the Chum Bucket moments after him and the rest of the town were cured of the infection from the tainted meat and went with others to the Krusty Krab to celebrate the town being saved.
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 at the Chum Bucket and rescue Gary. Jimmy and Plankton later arrive at 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, noting that SpongeBob has supposedly forgotten the pickles. Finally, he is defeated, returning Bikini Bottom normal once more.
"Really, Krabs? Is this some kind of new promotional gimmick? Surely, you can do better than this, Eugene. I mean, (takes out a pickle from Mr. Krabs' patty body) you even wasted real pickles on this cheap costume? (eats the pickle) Pretty insulting, if you ask me." —"Krabby Patty Creature Feature"
Judging from how Bubble Bass and SpongeBob look and talk to each other in "Pickles" and when Bubble Bass is crushing Plankton in "F.U.N.," it is evident that SpongeBob and Bubble Bass shared something of a rivalry long ago.
Bubble Bass didn't appear for many years after the first season until he was seen in the Season 8 episode "Plankton's Good Eye." He was seen in a fire and running out of the Chum Bucket with Larry, Sandy, SpongeBob, and Nat. He returns in "Larry's Gym" in Season 9 and begins to make more frequent appearances.
For unknown reasons, 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 fish's car keys.
He is voiced by Ikuko Tani, a woman, in the Japanese dub.