Buster Slime (or simply Buster) is an enemy in the Bomberman series. It appears as a translucent slime monster that tosses and catches a flame.
Super Bomberman 3
In Super Bomberman 3, Buster Slimes appear on the planet First Star. They are fast, and only change directions when they collide with a wall. Unlike many other monsters, they can reverse directions upon hitting a wall, even when they are not at a dead end. They have fire in their bodies, which they toss and catch at regular intervals, but this has no impact on gameplay.
In Bomberman Tournament, they are known simply as Busters, and appear in Pretty Base. Their movement pattern is identical to that of their earlier incarnation, except that, instead of tossing and catching fire while moving, they will occasionally pause on a tile space, toss the fire, catch it, and then continue on in the direction they were heading. They are also much slower.
This enemy first appeared in an earlier Hudson Soft game, Neutopia II. In that game, Buster's burst of fire actually damages the player.
1. Super Bomberman 3 Hudson Soft Guidebook, pg. 23
2. Bomberman Story Official Guidebook, pg. 44