|This article is about a/an ally in Juukou B-Fighter.|
|First Appearance:||A New Chapter: The Butterfly of Life|
|Last Appearance:||A New Chapter: The Butterfly of Life|
|Number of Episode|
Full list of appearances
Muscle (マッスル Massuru?, 40) is a mysterious armored amphibious alien who arrives on Earth with a shining feather that belongs to Saint Papilia. He was once healed by her power and has followed clues about her to Earth. Already weakened upon his arrival on Earth, Muscle confronts both the B-Fighters and the Jamahl forces only to be killed by Black Beet. Black Beet then gains possession of Papilia's feather. He is more of a guest character than a malevolent alien.
- "Hairball" - It's partially-repainted counterpart.