The Rowdyruff Boys are the male but wicked counterparts of The Powerpuff Girls, created by Mojo Jojo. They were made by flushing armpit hair, snails from the cafeteria, and the tail of the talking dog down a jail cell toilet that contained the apparent potency of Chemical X (snips, n' snails, n' puppy-dog tails). They have very similar abilities to the Powerpuff Girls, but they all possess very easily targeted weaknesses, originally an aversion to Cooties (fixed by HIM), shrinkage when their egos are damaged, and an obsession with destruction that can lead to their own downfall.
As of the Start of Phase 4, Boomer is the sole surivior as Brick and Butch were killed as a result of the war regarding Darkseid and Thanos and are buried under Slade's Manor.