Part of the Brave Police, he can combine with his motorcycle, the Gun Bike to form GunMax Armor, or transform with his GunBike to form the Max Cannon for J-Decker's use.

Unlike the other Brave Police units, GunMax does not have a vehicle form, instead riding a large motorcycle called the GunBike. He originally came off as being overconfident, cynical and sarcastic, preferring to operate alone and shuns others.

Grade schooler Yuuta Tominaga stumbles upon Deckerd, a humanoid robot under construction by the Japanese police, built to fight advanced forms of crime. Yuuta's constant contact with Deckerd gives the robot a "heart", or personality; when Yuuta is recruited as the "boss" of the "Brave Police" as a result, a true human/robot partnership occurs. <br><br>
(Source: Wikipedia)

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In August 2020, he was diagnosed with terminal stage 4 cancer, and has been undergoing chemotherapy treatment.