Boomer is an honorable sword fighter and a member of the Smithy Gang in Super Mario RPG: Legend of the Seven Stars. After Smithy's forces occupied Bowser's Keep, Boomer is placed in charge of the new base.
After Mario fights his way past Smithy's minions, Boomer challenges Mario's party to a duel on chandeliers, the same chandeliers Mario fought Bowser at the beginning of the game. In battle, Boomer wields a katana, and has the ability to power up his defense and offense. After being defeated, an injured Boomer will sever the rope holding the chandelier he is on and plummet to the ground (although Chandeli-Ho implies the possibility that he survived the fall), allowing Mario and his party to pass unhindered to the giant sword Exor.
 Names in Other Languages
- Boomer can best be described as a Shogun, which is an ancient Japanese commander. He even has an inscription of the Japanese flag on his helmet in his character artwork.