Koopa Bros.

The Koopa Bros. are Koopas in ninja garb that work for Bowser. So far, their only appearance was in the game, Paper Mario, for the Nintendo 64. They held Eldstar, the first of 7 Star Spirits. It was said they once lived in Koopa Village, a town of reformed Koopas. They then moved to a castle the Bob-ombs lived in and enslaved them. Eventually, Mario, with the help of Goombario, Kooper, and Bombette, saved the Bob-ombs and defeated the Koopa Bros. They later send a letter vowing revenge. They are clearly based off of the show called "Teenage Mutant Ninja Turtles".

Weapons and Attacks
The brothers seem to posses a smaller version of Mecha Bowser. Their main attack involves forming into tower and spinning into Mario.

Koopa Bros

 * Red Ninjakoopa
 * Black Ninjakoopa
 * Green Ninjakoopa
 * Yellow Ninjakoopa