Squeakers

Squeakers (Chulins in Japanese, also called Squeaks) make up the bulk of the Squeak Squad, and only appearing in Kirby: Squeak Squad. They make up the lowest rank in Daroach's gang, but there is a very large number of them. Ghost Kirby's ability to control his enemies won't work on them.

There are four colors of Squeakers: blue, green, yellow, and red. The color of the Squeaker determines its special abilities. Squeakers only appear under special circumstances - In a room with a big chest, the Squeakers will replace all of the original enemies in the room to impede Kirby's progress, so one of the elder Squeaks can catch up to Kirby.

Red Squeakers can supposedly throw normal or giant-sized bombs as suggested by unused sprits in the game data, but were not present in the retail version except in the cutscene at King Dedede's castle. They are capable of riding Warp Stars in the Smash Ride minigame.
 * Yellow Squeakers are capable of jumping in mid-air. They actively pursue Kirby, potentially running into pits or spikes themselves when doing so.
 * Green Squeakers throw normal sized bombs, similar to the ones that Bomb Kirby throws.
 * Blue Squeakers throw giant, powerful bombs. They throw slower than Green Squeakers and the bombs take longer to detonate, and have to be super inhaled.

Squeakers have some mouse-like traits, such as the faces and ears, but the rest of the body resembles a limbless ball with a small tail.

Trivia

 * The Squeakers appear as a sticker in Super Smash Bros. Brawl.