Duke is a character that appears in the Brave Police J-Decker series.
Originally built in England under the direction of Lady Regina, Duke was originally supposed to join the Brave Police division in Japan. After the loss of Deckerd, he stepped up as leader of the team, but met with heavy resistance from the rest of the members, and later stepped down after Deckerd returned.
Duke combines with Fire Roader to form Duke Fire, a large robot on par with J-Decker. Together, Duke Fire can combine with J-Decker for form Fire J-Decker, an even larger robot with enhanced abilities.