Bubble Bass

Bubble Bass is the biggest, fattest, and ugliest fish that has ever lived in the seven seas of the UnSpongeBob universe. He makes Squidward Tentacles look handsome, and that is saying something. Bubble Bass is also stupid and makes Patrick Star look smart, but that goes unsaid. He was absent in the show for about a decade until he returned in the Season 8 episode, Plankton's Good Eye. Most likely because he kept getting grounded even though he's suppose to be 30.