Rob-omb

Rob-ombs are a stronger variety of Bob-omb found in Super Mario RPG: Legend of the Seven Stars. These walking explosives wear purple shoes and work exclusively for the demented Booster. They can often be found walking in simple patterns in the stairwells of Booster's Tower. Also, Booster himself keeps a personal store of Rob-ombs on his private train to deal with any unwanted visitors. Like other Bob-ombs in the game, Rob-ombs can only attack by self-destructing, and damaging an opponent.

Trivia

 * Lethal Bob-ombs from Mario & Luigi: Partners in Time also have purple shoes, but this is likely a coincidence.