Matthew Keller/Explosive Boomer is one of the main villain and main characters of Team Rowdyruff 2. He is a 15-year old boy and is one of the members of the Powerpuff Girls Z. He originated from the show 'The Powerpuff Girls' which was adopted by Toei Animation. The original creator of the characters and the show is Craig McCracken. His weapon is a baseball bat.
- He is voiced by Aidan Drummond.
- Matthew Keller/Explosive Boomer is the same character as Boomer from The Powerpuff Girls.
- Boomer's theme color is blue.