This list of characters is by no means exhaustive. Nor does it even cover the major characters in the war itself. Although it may reveal more than people who are spoiler sensitive may wish there are things it does not even hint at, much less people that are not listed who play key roles in the series.

	Kusama Daisaku Only 12-years-old, he came to control Giant Robo when his father died. His father gave him Robo to fight against Big Fire and Daisaku tries to do so to the best of his ability by aiding the IPO. His father was killed by Big Fire when he tried to wrest Giant Robo from them, leaving Daisaku to finish the battle.
	Ginrei She is the daughter of Franken von Fogler, who was thought to have died at the tragedy of Bashtarlle. She managed to escape the tragedy along with one of the assistants to the five scientists developing the new power source by means of her ability to teleport. However, the cost of using her power is that it shortens her life.
	Taisou A strong sailor type, he joined the IPO when he was 12 like Tetsugyu did. He is one of the most powerful membersof the organization, with the exception of their Chief. It is he who caused Prince Albert of Impact to lose an eye and has earned his enmity because of that. He serves as a source of strength, wisdom, and a sense of what is right to do for both Tetsugyu and Daisaku. He also provides some important insights into his enemy.
	Youshi of the Blue Face Taisou's wife, she is strong and direct. She serves as a good counter for Taisou when he is too serious but in truth she has the same type of role in the story: She shares the blunt honesty and truth to do what is right, even at the cost of one's own life. She wields a staff that can be any length she wishes and cannot be broken.
	Tetsugyu The "Iron Ox." Tetsugyu is like a younger brother to Taisou and at first he resents Daisaku. He grows very fond of Daisaku and tries to lead by example showing that no amount of personal pain should be a reason to give in. He usually wields a pair of battle axes attached to long chains (of about any length he wishes them to be).
	Go-sensei Previously an assistant along with Genya to the five scientists at Bashtarlle, he is one of the few survivors of the tragedy and was left to believe that both Genya and Dr. Franken von Fogler died when the experiment went wrong. The memory of that tragedy haunts him throughout the story as he tries to figure out and come to terms with what really happened 10 years ago. As an expert of the IPO he serves as their primary expert on the Shizuma technology and he also happens to be very handy with battle fans.
	Genya The brother of Ginrei, the son of Franken von Fogler. He was an assistant along with Go-sensei at Bashtarlle. Originally believed to have died along with his father at the tragedy he shows up later as a tool of Big Fire. Consumed with a desire for revenge towards Shizuma and what he believes is the betrayal of his father he will stop at nothing to exact his revenge and stop Shizuma no matter what the costs or whose purposes he serves. This is probably the greatest tragedy in the story. In his dark quest he carries out what he thinks his father's wishes are which ends up having a rather bitter result.
	Franken von Fogler Believed to have died at Bashtarlle he seems to turn up early in the series giving the impression that he has returned for revenge. Is he the evil genius that caused the tragedy? Is Genya following the wishes of a ghost?
	Dr. Shizuma The leader of the team which manages to pull the Shizuma drive from the wreckage of the disaster of Bashtarlle. The drive is supposed to usher in a new age for humanity. But, as we learn early on in the series, great power leads to even greater dangers as Big Fire is only too happy to employ in their cause.
	Albert of Impact One of the Magnificent Ten of Big Fire. He is continually bridled by having to report directly to Genya on the current project. He does not trust how he is watched by Ko-Enshaku or Genya's methods. He himself, however, is blinded by his own hate for Taisou. Taisou cost him his eye and apparently one of his friends during the battle for the control over Giant Robo.
	Ko-Enshaku This mysterious person appears to be following Genya's orders in tracking Prince Albert, but who does he really follow and what are his objectives?We get almost no feedback from his masked face except for one slightly surprised look half way through the series. He is the perfect henchman, loyal to his master.
	Chief Chujo The leader of the IPO and the experts. He is apparently the most powerful of their experts. So powerful that when he almost enters battle in episode one Go-sensei entreats him not to engage. What can he do that would cause Go-sensei to risk Ginrei, Daisaku, Dr. Shizuma and the third sample?
	Murasame Kenji, The Immortal He has a rather special power and in some ways is supposed to be able to rival Chujo. The basis for his power, however is not offensive. Kenji is immortal. He can not die. His power is his curse. His friends and those he cares for die. He is forced to keep himself separate and can only serve as a sober lesson for people like Daisaku who have to come to terms with the results of this war they are engaged in. He has a special place in his heart for Ginrei as we find out and this causes him his final pain.
	Issei Doujin, the monk He is frequently cast as Youshi's partner. He is a curious mix of Taoism and Buddhism and other odds and ends. Although he is capable of offensive tactics his role functions more as support in any attack. A master of illusion and disorientation, he can frequently lend his teammates the extra edge they need.