Bumpty

Bumpties are a race of penguin-like creatures that first appeared in Super Mario World 2: Yoshi's Island. They are usually found in icy regions. Most Bumpties are blue—however, pink and green individuals were shown in Paper Mario. Their name is a corruption of "bumpy", referring to their bouncy, rubbery feathers.

Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
Bumpties are usually found wandering around in icy areas of Yoshi's Island in their debut game, Super Mario World 2: Yoshi's Island. While Yoshi can grab Bumpties with his tongue, he cannot eat them. Also, if he runs into one, he is bumped backwards, hence the name. This means that Bumpties can't hurt Yoshi. Their official artwork depicts them as a more purple shade of indigo.

They can also steal Baby Mario if Baby Mario has already been knocked off Yoshi and is floating towards one, like a Bandit.

Tetris Attack
A certain Bumpty appears in Tetris Attack, allied with Dr. Freezegood. In here, he is depicted as Yoshi's friend, but enchanted by Bowser and his minions to work for him. Yoshi and Bumpty become friends again after freeing him and Dr. Freezegood from the spell. He also notes in the game, that others say that he's cute, but he really doesn't like it, and would like to be said as cool.

Note that Bumpty only appears in the SNES version of Tetris Attack. He does not appear in the Game Boy version.

Yoshi's Story
Bumpties reappear in Stage 3-4: Frustration in Yoshi's Story. They still repel Yoshi if run into, but they can be eaten.

Yoshi's Island DS
They also appear in Yoshi's Island DS in Baby Bowser's levels. Here they can be defeated simply by blasting them with one of Baby Bowser's fireballs.

Yoshi's New Island
In Yoshi's New Island, Bumpties appear in World 5-1, Brave the Bumpty Blizzard. They are colored purple, similar to their original artwork, instead of blue. Unlike previously, they will not steal Baby Mario if he has been knocked off Yoshi's back.

Yoshi's Woolly World / Poochy & Yoshi's Woolly World
In Yoshi's Woolly World and Poochy & Yoshi's Woolly World, Bumpties can be eaten, but not converted into a Yarn Ball, instead being spat out. They will bounce Yoshi away if they hit him. They appear only in the levels Big Montgomery's Ice Fort, Snowy Mountain Lift Tour and Wonderful World of Wool.

Paper Mario series
Bumpties in the Paper Mario series are referred to as penguins.

Paper Mario
Bumpties return in Paper Mario. In this game, Mario travels to a city of Bumpties called Shiver City. He also meets a famous writer named Herringway who is a Bumpty. In this game all the Bumpties are allies, not enemies. A small group of Bumpties (Including Mayor Penguin) appear in Princess Peach's Castle prior to the arrival of Bowser.

Paper Mario: The Thousand-Year Door
Bumpties also make a small appearance in Paper Mario: The Thousand-Year Door where they live in Poshley Heights, a town of the rich and famous. Mario also meets an incompetent detective Bumpty named Pennington.

Super Mario Advance 4: Super Mario Bros. 3
Bumpties also appear in Super Mario Advance 4: Super Mario Bros. 3, only appearing in the World-e level Slip Sidin' Away. The sprites are exactly the same as in Yoshi's Island, but with a slightly-different palette. Players cannot harm them unless they use a Fire Flower or Hammer Suit. If players try stomping on it, they are bounced off, and if they touch it from the side, players will not be harmed, but they will be knocked off to the side.

Notable Bumpties

 * Herringway
 * Mayor Penguin
 * Penguin patrol
 * Pennington

Notable settlements

 * Yoshi's Island
 * Shiver City (Bumpty Capital)
 * Poshley Heights

Trivia

 * The official wallpaper of World 5 from Yoshi's Island: Super Mario Advance 3 released by Nintendo features the official artwork of Raphael the Raven, but shrunk and recolored to resemble a Bumpty.