Boomer is a member of the Rowdyruff Boy trio, and the male counterpart of Bubbles. He and his brothers (Brick and Butch) were created by Mojo Jojo and later resurrected by Him. Both villains used the boys in an attempt to defeat the Powerpuff Girls. Boomer is often teased and tormented by his brothers, which (as revealed in FusionFall Legacy) evidently caused Boomer to lose almost all self-confidence.
Before Fuse invaded, Boomer took part with his brothers in creating chaos in Townsville and fighting the Powerpuff Girls, but over time he began wondering why they had to defeat the Powerpuff Girls or even why he had to be a villain, when he could just as easily use his powers more usefully. He eventually conceived the idea of trying to be a good guy, a notion that his brothers found ridiculous, as they enjoyed spreading chaos. With brothers so ruthlessly in favor of crime, Boomer soon resolved that he no longer wanted any part in their antics and chose to stay behind while they were wreaking havoc, a resolution his hooligan brothers hardly even noticed.
Nevertheless, after the invasion, Boomer tried to convince Brick and Butch to help in the war effort; they simply laughed at him, but became furious when they realized he was serious. Believing it better to destroy than to protect, the Rowdyruff Boys disowned their brother and drove him away. All alone, he determined to ask advice from Professor Utonium, who suggested asking his daughters for help. Boomer somewhat timidly approached Bubbles, choosing her because of their similarities; despite his doubts and fear, he asked if she could show him how to be a hero, which after a bit of skepticism she agreed to do.
The two decided to investigate Townsville Zoo in search of the animals which had gone missing during the Fusion invasion; however, because Bubbles had at times to work with the Mayor, Boomer needed to find some other partner, and so recruited Jackie Khones from Foster's to help whenever Bubbles was unavailable.
- Boomer was the first of the Rowdyruff Boys to be revealed.
- Boomer's Nano has freckles and a "Kick Me" sign, though Boomer himself does not.
- Much like the Powerpuff Girls, Boomer was given a redesign for FusionFall Legacy. He now has fingers, a nose, and ears (features he did not have in the series), as well as additions to his outfit such as a collared black sweatshirt under his shirt.
- He also seems to have a second outfit slightly based on his appearance in Powerpuff Girls Z.
- Much like Ace and a few other villains, he seems to have reformed from his criminal ways.