Boom Boom

Boom Boom is one of Bowser's henchmen, and the most well-known member of the eponymous species. He is an antagonist in the Mario series and among Mario, Luigi, Yellow Toad, and Blue Toad's most persistent foes. Boom Boom first debuted in Super Mario Bros. 3, where he battles Mario or Luigi in fortresses, before the Mario Bros. fight a Koopaling in an airship. Boom Boom then later made his return appearance in Super Mario 3D Land as the game's secondary antagonist who often appears in airships, along with his partner Pom Pom. After Super Mario 3D Land, Boom Boom reappeared in later games more often. Compared to Bowser's species, he has a complete shell instead of a carapace not directly connected to his plastron, and the shell itself may not have spikes on it, depending on the game.