TYPE: Boss, Alien.
AFFILIATIONS: Smithy Gang.
CLOSE RELATIVES: None.
SKILLS AND ATTACKS: Skewer, Storm, Shaker, Blast, Switch Power Type.
STRENGTHS: Strong against Fear, Poison, Sleep and Silence. Can switch between high physical and high magic stats.
WEAKNESSES: Jump, Star Rain.
Boomer is a soldier that Smithy put in charge of the minions of Bowser's Keep. He wears Samurai-style armour that can change colour, endowing its owner with either greater physical power or great magical power.
Boomer is fond of drama: he enjoys making speeches, and his closest friend in Bowser's Keep was the Chandeli-Ho that held his chandelier aloft for flashy fight scenes. The Chandeli-Ho insists that Boomer's final act of falling from the chandelier didn't hurt him, but he's never been heard from since.
It's uncertain whether Boomer was one of Smithy's inventions or a humanoid, but no Machine Made versions of Boomer were seen in the Smithy Factory.