GR-1

The former Big Fire robot that Daisaku controls, GR-1 is the only thing standing in the way of Big Fire's world domination plan. Built primarily for land combat but overhauled to have flight and naval capabilities in volume 2, GR-1 is powered by a nuclear engine located in the abdomen section and is armed with a missile launcher hidden in its head, a laser beam emitted from its eyes, and a heat ray cannon located on its belt buckle. It is also quipped with a minesweeper on its feet. In GR: Giant Robo, GR-1 is able to manipulate gravity using the bolts on its ankles and wrists, which allows it to briefly move at blinding speeds and punch with more force. This power is increased to allow levitation when it is combined with GR-8 "Dakolar." This also grants it the ability to fire its forearms attached to GR-8's tentacles. GR-1 is at times hinted to be self-aware and will act on its own will to protect Daisaku.