Duo Maxwell

Born in the colonies. He grew up on the streets as an orphan and became a leader among street gangs. He eventually found refuge at the Maxwell Church, a convent that ran an orphanage, but experienced the "Maxwell Tragedy" where he lost both the church and the sisters in the crossfire of war. Afterward, he sought shelter with Professor G and was trained as the pilot of the Gundam Deathscythe. Although he calls himself the "God of Death," he is the most sociable and human-hearted member of the group. Alongside Heero and the others, he takes flight once again in the Gundam Deathscythe Hell EW.

Quatre Raberba Winner

Born in the colonies. The eldest son of the wealthy Winner family, which holds vast assets in space (he has 29 older sisters). A gentle and peace-loving boy, his rebellion against the cruel United Earth Sphere Alliance led him to cooperate with Doctor S, becoming the pilot of the Gundam Sandrock by his own will. He commands absolute loyalty from the members of the Maganac Corps, a private space security force, who refer to him as "Young Master." He once fell into a state of madness due to the psychological shock of his father's death, leading him to develop and run amok in the Wing Zero, but he eventually regained his sanity thanks to Heero and the others. He proposed and led the plan to dispose of the five Gundams into the Sun as a symbol of peace. However, when the Mariemaia Army's coup occurs, he immediately changes course despite feeling the weight of his own naivety. He pursues the transport ship heading for the Sun to retrieve the Gundams and return to the front lines.

Trowa Barton

Origin and real name unknown. A natural-born mercenary who has drifted through battlefields since early childhood without even having a name. While working as a mechanic at the development site for the Gundam Heavyarms, the original pilot—the real Trowa Barton—was assassinated, leading him to assume that name and mission to descend to Earth. He once spent time as a knife-thrower in a circus troupe after suffering from amnesia. After fighting alongside Heero and the others, he lived as a member of the circus, but sensed the suspicious movements of the Mariemaia Army. Utilizing his past experience in infiltration, he joins the Mariemaia Army as a soldier to investigate and sabotage their operations and armament scale from within. He, too, eventually sorties in his Gundam.

Chang Wufei

The grandson of the leader of the Long clan, inheritors of ancient Chinese martial arts. Originally an intellectual aiming to be a scholar, he awakened as a warrior following the death of his wife, Meilan Long, who died fighting to protect him from the United Alliance's biological weapons targeting the colonies. He pilots the Shenlong Gundam, which he believes houses her soul, fighting to prove his own "justice." After the war, he suffers from intense inner conflict, wondering where the justice of those who died in battle goes in a peace obtained by discarding weapons. Driven by this doubt, he temporarily joins the Mariemaia Army, which affirms the act of fighting. He engages in a fierce duel of convictions against Heero, who comes to stop him.

Relena Darlian

As the survivor of the Sanc Kingdom royal family, she advocates for Total Pacifism and exerts a strong influence on the world. Despite being caught up in numerous political upheavals, she is a girl who draws people in with her unwavering convictions and supported Heero Yuy and the others. While working toward peaceful diplomacy as the Vice Foreign Minister of the unified nation after the war, she is abducted by the Mariemaia Army. Even under detention, she never yields, continuing to preach the true meaning of peace to the young Mariemaia.

Mariemaia Khushrenada

A seven-year-old girl claiming to be the daughter of Treize, the former OZ leader who was defeated in battle against Heero. She is set up as the dictator of the Mariemaia Army, serving as a puppet for her grandfather, Dekim Barton, to lead the world into war.