Though the age of mucusboy is unknown it is clear that he is a minor.
Mucusboy had a normal childhood till one day he got mugged on the street. He was saved by the wondrous Captain Earwax and seconds later selected to be his new side-kick. Mucusboy clearly states that he never agreed with this but stayed with the Captain, probably to ensure he won't hurt himself by accident.
- Hand to hand combat
Mucusboy is a martial arts master. But he never get's to use it.
Mucusboy doesn't have any real powers. The Captain just came up with the name because it sounded cool. (not as cool as his own name of course)