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 olive-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.
Bubble Bass places a complicated order, which SpongeBob serves. However, Bubble Bass claims that SpongeBob forgot the pickles, which makes Spongebob go into a state of shock and takes time off of work, claiming he has forgotten how to make Krabby Patties altogether.
However, SpongeBob later gets his confidence back and resumes his role as a fry cook at the Krusty Krab 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 and tells SpongeBob that he has failed 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 and make SpongeBob look bad, and exposes Bubble Bass of his true colors.
At the mercy of the angry customers, Bubble Bass escapes before they can punish him by running away like the coward he is.
Bubble Bass makes a minor appearance in this episode when he accidentally plops himself on top of Plankton, smashing him. When SpongeBob asks him to move, Bubble Bass gives a mean smile and gets comfortable in his seat. Crunching can be heard as Plankton is smeared and squished by his butt. He eventually leaves when SpongeBob throws popcorn.
At the end of the episode, he confuses Plankton for a jelly bean and chases him about his hand when he starts running.
"Fools in April"
Bubble Bass makes a cameo when SpongeBob gets tricked by Squidward and runs into his buttocks, making a large square indent. It should be noted that Bubble Bass' physical appearance in this episode is not the same as it usually is; instead of being dark olive-green, he is mauve.
"Plankton's Good Eye"
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 seen when SpongeBob gives Plankton the "great big hug."
Bubble Bass supports "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, confronting a zombified Mr. Krabs at night, unaware of his condition, thinks he is wearing a costume and eats the real pickles on his "fake" costume, causing him to transform into a Double Triple Bossy Deluxe.
He is later seen in the Chum Bucket moments after him and the rest of the Bikini Bottomites are cured of the infection from the tainted meat and goes with others to the Krusty Krab to celebrate the town being saved.
Squidward confronts him about stealing his clarinet as earlier in the episode Bubble Bass gets annoyed by Squidward. After Squidward confronts him and he denies it, him and SpongeBob have a fight with action figures in which SpongeBob won and Bubble Bass ultimately lost.
Bubble Bass is the main antagonist in this episode, pretending to be injured so he doesn't have to help SpongeBob and Patrick move his stuff. He is then evil at the end, eating the free lunches he promised SpongeBob and Patrick. However, he gets his comeuppance when his mother wheels him around, intentionally crashing into things as payback for her being stuffed in a box.
When Mr. Krabs is selling SpongeBob merchandise, Bubble Bass approaches him and asks how much Patrick is, thinking he is a standee. Mr. Krabs offers him twenty dollars, but Bubble Bass rips off Patrick's arm and says that he is damaged. Mr. Krabs then offers him ten dollars, and Bubble Bass accepts.
In his first appearance, Bubble Bass and SpongeBob initially were rivals and despised each other. However, in recent appearences, SpongeBob seems to be more friendly towards him. SpongeBob and Patrick even help move Bubble Bass out of his mom's house in the episode "Moving Bubble Bass." Despite despising SpongeBob, Bubble Bass helps him get the Krusty Krab turned back to normal in "Larry the Floor Manager."
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 squishing Plankton in "F.U.N.," it is evident that SpongeBob and Bubble Bass shared a rivalry long ago.
Bubble Bass didn't appear for 12 years after the first season until he was seen in the season 8 episode "Plankton's Good Eye."
For unknown reasons, in "Plankton's Good Eye," Bubble Bass' voice is higher pitched. He also seems kinder and friendlier in the new portrayal.
Bubble Bass is voiced by Ikuko Tani, a woman, in the Japanese dub.