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 has evidently caused Boomer to lose almost all self-confidence.
- Boomer was the first of the Rowdyruff Boys to be revealed.