Bumpty

Bumpties are a race of penguin-like creatures from the Yoshi franchise, in which they first appear in Super Mario World 2: Yoshi's Island. They are usually found in icy regions, and are generally seen either patrolling or jumping around on the ground, although they can also be seen flying, unlike real-world penguins. Bumpties have pear- or egg-shaped bodies, and are usually blue in color. Their name is a corruption of "bumpy," referring to their bouncy, rubbery feathers. Bumpties also appear in the earlier Paper Mario titles, in which they are named Penguins, although they are not featured as enemies.

Super Mario World 2: Yoshi's Island
In Super Mario World 2: Yoshi's Island and its Game Boy Advance remake Yoshi's Island: Super Mario Advance 3, Bumpties are found in the icy areas of Yoshi's Island, most notably World 5. Unlike most other enemies, Bumpties do not harm a Yoshi if it touches them, but instead bumps them away, hence their name. Bumpties are often found on slippery ice, in which case bumping into it causes Yoshi to slide even further back. Some Bumpties rush after Yoshi, with little slippage on the ice in doing so, and follow his movements. Yoshi can grab a Bumpty using his tongue, although he cannot swallow them. Bumpties cannot be defeated.

Tetris Attack
In Tetris Attack, a Bumpty appears alongside Dr. Freezegood in the "Ice World," as the second ally to be saved from Bowser's control. Bumpty replaces Sharbet from the game's original Japanese equivalent, Panel de Pon.

Yoshi's Story
In Yoshi's Story, Bumpties make a reappearance, behaving similarly as in Super Mario World 2: Yoshi's Island. A difference is that a Yoshi can now eat a Bumpty.

Yoshi's Island DS
In Yoshi's Island DS Bumpties once again appear in several of the icy levels, having similar behavior as in Super Mario World 2: Yoshi's Island. Baby Bowser can quickly defeat a Bumpty by spitting out a fireball at it.

Paper Mario
In Paper Mario, the penguins live in a town named Shiver City, which has Mayor Penguin as its mayor. While they are not enemies, the penguins express hostility toward Mario, whom they believed had murdered the Mayor Penguin after Mario had been accused of doing so by by Mayor Penguin's wife. Another penguin, named Herringway, has been missing recently, and Mario has to find Herringway and bring him to Mayor Penguin to clear his name and be allowed to leave Shiver City.

Paper Mario: The Thousand-Year Door
In Paper Mario: The Thousand-Year Door, the penguins live in Poshley Heights, a town of the rich and famous. Here, they typically say 'eh' in between sentences, an exclamation stereotypically associated with. Prior to arriving there, Mario meets an incompetent detective penguin named Pennington on Excess Express.

Super Mario Advance 4: Super Mario Bros. 3
Bumpties also appeared in Super Mario Advance 4: Super Mario Bros. 3, exclusively in the World-e level Slip Slidin' Away. They act the same as in Super Mario World 2: Yoshi's Island, from which their sprites are reused, albeit slightly brighter, although still slightly darker than in Yoshi's Island: Super Mario Advance 3.

Trivia

 * A wallpaper of World 5 from Yoshi's Island: Super Mario Advance 3 features artwork of Raphael the Raven albeit shrunk and recolored to resemble a Bumpty.