|This article is about a/an villain and anti-hero in Juukou B-Fighter.|
- "Shadow" is also the name of a villainess in Jikuu Senshi Spielban, as well as Toby Mendoza's evil form in Zaido: Pulis Pangkalawakan.
Shadow is highly powerful, and by raising his Black Commander (ブラックコマンダー, Burakku Komandā) and shouting "Jakou!" (邪甲!, Jakō!, Evil Shell!), became a formidable opponent to the other B-Fighters as Black Beet, whose armor was modeled after a Longhorn beetle. To prove his own existence, he tries to kill Takuya. Because he was a short‐lived clone, Shadow couldn't survive on his own and sought Saint Papilia's power to obtain immortality for himself. His weapons are a black Input Magnum known as the Jamming Magnum, and an extending hand-claw known as the Stinger Byoot. He falls because his longevity was lost though he gives Blue Beet a mortal wound.
He was later revived and absorbed by Jagual in the finale.
- Black Commander (ブラックコマンダー Burakku Komanda) - Shadow's transformation device to transfrom into Black Beet. A Black version of the B-Commander, Shadow shouts "Jakou!" to become a formidable opponent to the other B-Fighters as Black Beet, whose armor was modeled after a Longhorn beetle. To prove his own existence, he tries to kill Takuya.
- Jamming Magnum - A black version of the Input Magnum that was used by Black Beet.
- Stinger Byoot - An extending hand-claw that serves as Black Beet's main weapon.