Bugs look like brown worms or striped caterpillars with a couple of large eyes. The ones dropped by Whispy's Revenge appear about twice the size of normal bugs, and are purple instead. Some sprites portray bugs as fuzzy.
In the Revenge of the King sub-game, they are used in the fight against Whispy's Revenge. This time, however, they appear purple and much larger.
Bugs also appear in the Snack Tracks sub-game. They appear on the conveyor belt along with food, bombs, and rocks. They can appear by themselves or stuck inside of a Maxim Tomato, making them a rather annoying obstacle. These bugs must be tapped once to be destroyed.
A bug also appears in the Special-Edition Blooper Reel video; in the cutscene from Dyna Blade, instead of an apple falling on Kirby's head, a bug falls on his face, prompting Kirby to start gasping for air before seemingly losing consciousness.
Bugs appear again in Kirby: Planet Robobot's Team Kirby Clash sub-game (as well as the downloadable Team Kirby Clash Deluxe). They once again appear as one of Whispy Woods' attacks. Bug is one of the three enemies in the entirety of Team Kirby Clash Deluxe.