Marin Reigan is the central protagonist of the anime Space Warrior Baldios. He is a young man originally from the planet S-1, a world whose surface has become uninhabitable due to severe radiation and environmental pollution, forcing its population to live in underground cities. Marin is the son of a leading scientist on S-1 who was heading a project to restore the planet's ecosystem. When the military fanatic Zeo Gattler stages a coup, assassinates the emperor, and frames the scientific team, Gattler's forces invade the laboratory, killing Marin's father and the other scientists. During the attack, Marin accidentally kills Milan, the brother of the enemy commander Rosa Aphrodia, an act that creates a personal blood feud between them. Escaping in his advanced subspace-capable ship, the Pulsar Burn, Marin is caught in the warp distortion of Gattler's fortress and is thrust through time and space, crash-landing on Earth's moon in the year 2100. After witnessing the destruction of a Martian colony by Gattler's Aldebaran Army, Marin joins the Earth defense organization Blue Fixer. His ship becomes the core component of the giant robot Baldios, which he pilots alongside Earth pilots Jack Oliver and Raita Hokuto. Marin's motivations are layered. Initially driven by a desire for vengeance against Gattler and Aphrodia for his father's murder, he gradually finds a new purpose in protecting Earth, a pristine and vibrant world that reminds him of what his home planet once was. His personality is defined by a strong sense of justice and a deep love for nature, which clashes with the militarism of his former people. He is a skilled pilot, the only one capable of controlling the Pulsar Burn, and a determined warrior, but he is also marked by profound loneliness. He is isolated from both his human allies, who initially distrust him as an alien, and his own S-1 people, who view him as a traitor. His role in the story is that of a tragic hero caught between two worlds. He serves as the primary pilot of Baldios and the main military asset for Blue Fixer in their defense of Earth. His key relationship is the complex love-hate dynamic with Rosa Aphrodia. The two share an instant attraction and love before discovering they are mortal enemies, and their conflict of feelings is at the emotional core of the series, often overshadowed by the brutal war around them. In terms of development, Marin's journey is one of personal growth from a revenge-driven fugitive to a protector of Earth who understands the cyclical and tragic nature of war. He is forced to confront the terrible consequences of conflict, including the devastating flooding of Earth caused by Gattler's artificial suns. A crucial revelation is that he and the Aldebaran Army have inadvertently traveled back in time; the Earth they are fighting over is the ancient past of S-1 itself, creating a closed time loop. In the series conclusion, Marin witnesses the nuclear destruction of Earth's surface but survives, carrying the weight of the knowledge that this doomed world will one day evolve into S-1. In the theatrical film version, he shares a final confrontation with Gattler alongside Aphrodia before carrying her back to Earth. His notable abilities include his exceptional piloting skill, particularly his mastery of the Pulsar Burn and its ability to travel through subspace. As the core pilot of the combined robot Baldios, he is instrumental in nearly every battle against the Aldebaran forces.