The Koopa Bros. are a quartet of costumed ninja Koopa Troopas; they are followers of Bowser and his Koopa Troop. The Koopa Bros. consist of Green Ninjakoopa, Yellow Ninjakoopa, Black Ninjakoopa and the leader, Red Ninjakoopa. They are all egotistical and obsessed with being cool, though they have a great deal of respect for Bowser and each other.

the Koopa Bros. were originally inhabitants of Koopa Village, apparently living in it around the same time as Kent C. Koopa. Eventually, the Koopa Bros. grew tired of Koopa Village, finding its serene environment and lack of excitement boring. The...