Boss Bass

A Boss Bass is a huge Cheep Cheep that eats seafarers. It has a mouth-brooding counterpart called Big Bertha. In Super Paper Mario, it is implied in a passing mention that they eat normal-sized Cheep Cheeps.

Super Mario Bros. 3
In this game, Boss Bass swims on the surface of the water trying to leap out and eat Mario if he gets too close. It does not matter which form the player is in because Boss Bass will defeat Mario instantly in one gulp, even if he is a statue. In both of the stages he appears in, the water level rises and sinks, making Mario an easy target. Throwing blocks, shells, hammers, and fireballs at Boss Bass can defeat him, as well as tail attacks and using a Super Star, but he'll eventually come back. However, in Super Mario Advance 4, if the player has turned on the e-reader card that makes enemies hit by fireballs turn into coins, and the player successfully hits Boss Bass with a fireball and collects the coin, Boss Bass will not return for the rest of the level.

The Adventures of Super Mario Bros. 3
Boss Bass make appearances in The Adventures of Super Mario Bros. 3, where they usually chase after Mario and his friends.

Mario Teaches Typing
In the second mode of Mario Teaches Typing, Underwater World, the game repeatedly loops footage of Mario, Luigi or Princess Toadstool swimming away from either a Boss Bass or a Blooper. Their appearance is slightly different: fins are cyan, they have several sharp teeth rather than a single blunt tooth., and they have round pupils with eyebrows instead of squinting pupils.

Super Paper Mario
Boss Bass are given a passing mention in Super Paper Mario by a Shayde, who said that he fell into the ocean once, but luckily could swim as well as a Cheep Cheep. Unfortunately, a Boss Bass thought that since he swam like a Cheep Cheep, he was one himself, and the huge fish ate him.