This is a list of enemies in the Mario series of video game.
Bloopers ( in Japanese, originally known in English as Bloobers) are white, squid-like creatures that first appear in Super Mario Bros. In some Mario sports games, the Mario Kart series and Super Mario Sunshine, they are items that can be used by players. In Mario Kart, they temporarily reduce drivers' visibilities by spraying ink on them. Blooper is also an unlockable playable character in Mario Party 8. To unlock him, the player has to beat the Star Battle Arena once. He was also an unlockable character in Mario Super Sluggers. Two variations of Blooper appear in Mario and Luigi: Bowser's Inside Story: the "Bubble Blooper" and the "Dried Blooper".
Bob-ombs, known as in Japan, are living bomb, sometimes with windup keys on their backs. They wander around aimlessly and eventually explode on their own if not picked up, stomped on, or thrown around. They first appeared in Super Mario Bros. 2. Bob-ombs are common enemies in Super Mario 64 as well as allies. In these games, Bob-ombs are first encountered in Bob-omb Battlefield, a level that is ruled by King Bob-omb. Paper Mario and Paper Mario: The Thousand-Year Door feature two playable Bob-ombs named Bombette and Admiral Bobbery respectively. They appear as items in other games, including the Mario Kart and Super Smash Bros. series. In Mario Super Sluggers they appear in a mini-game called Bob-omb Derby, where you hit them to create fireworks. Bob-ombs also made an appearance in the Super Mario Brothers movie, where they are shown to be the size of a golf ball with a wind up key on its back.
Bob-omb is also referred to in the comic book series Scott Pilgrim as the name of Scott's band: "Sex Bob-omb".
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Links: Wikipedia Mario Monsters Answers.com