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Coalbits are small creatures made out of coal that appear in the Mario & Luigi: Bowser's Inside Story. Their name is patterned after "Coal" and "Bit", meaning a piece of something. They assist Choombas in battle.
Coalbits do not actually attack when fighting Bowser. Rather, they jump into the smokestack of the Choomba they are traveling with to power it up and allow it to attack multiple times in a row if Bowser doesn't inhale them quickly; they may also flee from battle. If Bowser inhales the Coalbits with his vacuum attack, Mario and Luigi must fight them.
To attack, the Coalbits line up in front of one of the Bros. and march towards him with their pincers in the air, forcing the Bro to jump over all of them at once. If there are too many in the battle for the brother to be able to jump, there will be breaks in the Coalbits' formation that the player must time their jumps between. Coalbits are usually found in groups of three in tandem with Choomba, but sometimes can be found in groups of five on latter parts of the Tunnel. Strangely enough, though coal is flammable, Coalbits take no damage from the Fire Flower special attack or the Flame attack. They are also one of the very few enemies to be able to resist a stat down.
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