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J-Decker (ジェイデッカー) is the titular Brave robot of The Brave Police J-Decker television series. He is formed from the Police Combination (警察合体 - Keisatsu Gattai) of Deckerd and the J-Roader. He can then combine with Duke Fire (BP-119 Duke, Fire Roader) to form Fire J-Decker. When combined with BP-601 GunMax and Gun Bike in their Max Cannon configuration, J-Decker is known as J-Decker Max Cannon Mode (ジェイデッカーマックスキャノンモード).

According to Juuzo Saejima, the "J" in J-Decker represents the Japanese police force while "Decker" (デッカー) is a shifted spelling of "Deka" (デカ), an archaic Japanese word meaning detective.


J-Decker usually was used as a last resort against monsters too large and powerful for the Brave Police to bring down by themselves, and often in conjunction with Super Build Tiger. He is capable of flying using the wings on his back, which allows him to combat aerial enemies effectively. He can also utilize GunMax with the Gun Bike as the powerful Max Cannon.

For the final battle, a manual-piloting system has been installed on J-Decker in case that Deckerd's A.I unit went offline, which allowed Yuuta to continue fighting.


  • J-Buster (ジェイバスター)

A rifle stored in the right leg that can switch between the ammunition-based Gun Mode (ガンモード) or the high-powered beam-based Rifle Mode (バスターモード) by flipping the barrel beneath the gun down or up.

  • Electromagnetic Baton (Denji Keibou - 電磁警棒)

J-Decker's main close-combat weapon, stored in the left side skirt armor. It is a baton that has been electromagnetized to increase damage and retracts into a smaller form when stored. The baton can also discharge a blast of electricity at opponents.

  • Max Cannon (マックスキャノン)

The transformed form of the Gun Bike with GunMax riding on it, now a powerful cannon which docks with J-Decker's right side skirt armor. This can be considered as J-Decker's ultimate finishing move.


When Deckerd first attempted to combine with the J-Roader, he ran into issues due to having his coding changed when he gained self-awareness. With Yuuta Tomonaga's help, he was able to overcome these issues and combine to beat Barbarossa, a magician using an air force to attack Japan.


Brave Saga

J-Decker is flight unit, it mean he won't reduce his movement by special floor effect. Upgrade his J-Buster can earn new attack: J-Buster Gun Mode, 4 range, very useful against enemy only had 3 range attack for counter attack.

Brave Wars

J-Decker first appear in episode 2, and appear again in episode 8a(Combine! Build Tiger), however J-Decker joining Chouta at episode 14. Later J-Decker will hide after Deckerd KIA or Might Kaiser arrive, until clear Deckerd is taken (Defeat Satan J-Decker) or Deckerd is Back.

Despite Fire J-Decker will cause J-Decker and Duke Fire (Later Gun Max) got replaced, at Great Mighty Power Dagwon episode, J-Decker and Duke Fire will appear again, because player need J-Decker use Max Cannon for movie collection (need on the fight movie).

Brave Police J Decker Characters
Brave Police Robots
Deckerd ( J-Decker / Fire J-Decker ) · Duke ( Duke Fire )
McCrane ( Build Tiger / Super Build Tiger ) · Power Joe · Dumpson · Drill Boy
Gun Max · Shadow Maru · Kagerou ( in Brave Saga series and Brave Wars )
Main Characters
Yuuta Tomonaga · Ayako Kimizuka · Regina Argine · Seia Onoue · Kurumi Tomonaga · Azuki Tomonaga · Juuzo Saejima · Shunsuke Toudou
Other Characters
Iwaki Reiko · Fay · Kazuto Azuma · Masaya Kashiwazaki · Masaki Kitagawa · Kikumaro Takano · Onoue Makoto · Takeuchi Hitoshi · Yuuichirou Tomonaga · Amami Tomonaga · Kapia · Emiri Aihara
Main Villians
Victim O'Rand · Ken Shinjo · Red Chieftain · Blue Chieftain · Black Chieftain · Armored Chieftain · Neuva Fahrzeug · Eva Fahrzeug · Gaizonite
Other Criminals
Older Bubble Gum Sister · Younger Bubble Gum Sister · Sister Nanase · Dr. Gauss · Noriyasu Cato · Yoshiki Kikaida · Yoshito Kikaida · Inti · Kirisak · Dr. Adolf Madoh · Abyss Guard · Satan J-Decker