Loud is an enemy from Kirby's Dream Land 3. It is a small, gray raincloud with round black eyes (similar to an N-Z's) that floats around like a regular cloud and sometimes starts to rain a little. It sometimes floats in random directions and makes it harder to be defeated. Once it's defeated, it won't appear again even if Kirby goes offscreen from the place it was first seen. It probably will appear if Kirby goes to a different stage and goes back to the stage that the Loud was seen at. Even though clouds are made of water vapor, they can drown in water. They act similarly to Zoos, an enemy from Kirby 64: The Crystal Shards. In Kirby Mass Attack, an enemy named Floof appears and is similar to that of Loud.
Loud's name probably comes from the fact that when thunder bolts are produced by grey clouds, they're loud. It could also be because Loud is cloud with no "c" at the beginning. Since Loud looks much like a cloud, both of these are plausible meanings.