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 trained and then sent to join the Brave Police division in Japan. However, he couldn't have arrived at a worse time, with the loss of Deckerd to the Chieftans. He tried to step up as leader of the team, but met with heavy resistance from the rest of the members. They took issue with his stubbornness and rejection of any emotion, and resented him for trying to replace Deckerd. Duke would later learn the value of emotional connections with others, and would eventually take over as Deckerd's unofficial second in command.

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.


Duke possesses a very grounded personality with strong senses of duty, honor, and loyalty, which can make him inflexible and stubborn at times. Spending his formative times under Regina's tutelage, she pushed him towards an unrealistic idea of perfection due to past traumas and the obsession of making a "perfect policeman." While Duke did manage to overcome most of this early conditioning, it still does occasionally show with his struggles of dealing with emotions and somewhat stiff personality.

He has a strong loyalty and connection to his creator, Regina Argine, whose demeanor towards him has softened in recent times with her conquering some of the demons of her past. A newcomer to the team, he also does not always fit in with the others in the Japanese Brave Police and this can cause conflicts.

Duke is passionate about nature, and in particular likes sea life like whales.