Edward Ingram, known as Commander Ingram, is the 24-year-old leader of the FSAF Yamato Tokyo unit. Hailing from Ingria (UK), he uses the first person "I" (formal/composed). He is always calm and collected, never wavering even in desperate situations. Conversely, he shows his human side by joking with subordinates and being kind to children. In battle, he leads from the front, sticking to a practical fighting style that utilizes limited resources. His weapon of choice is an assault rifle. His trademarks are a red Rising Sun cap and a red souvenir jacket. Leading the unit that crossed into Grandia after the world fell, he challenges the invading World Unification Army.

Lucas von Leine is a 23-year-old man from Helvetia (Switzerland) and the deputy commander of the FSAF Yamato Tokyo unit. He uses the first person "I" (polite). A handsome young man with gentlemanly, refined features and a model-like height, he is a reliable "nice guy" who never stops smiling. Even on a bleak battlefield, a refreshing air surrounds him. He is a mood maker who cracks jokes in the direst crises to ease the soldiers' tension. Furthermore, he is a huge fan of dancing; he often hums or performs light steps during pre-mission briefings or while on watch, much to the exasperation of those around him.

Jean-Luca de Verdier is an 18-year-old youth born into a prestigious noble family in Versailles (France). He uses the first person "I" (quiet). While he has refined features and a fragile, intellectual aura, he is extremely shy and fades into the background, usually avoiding contact and mumbling when he speaks. However, he changes completely when the topic turns to combat or weapons, showing a sharp glint in his eyes. He favors a heavy, high-firepower full-auto shotgun that belies his appearance, unleashing intense firepower on the front lines. He is a young man characterized by the gap between his quiet personality and his boisterous weaponry.

Kenichi Kashiwagi is a 25-year-old man from Yamato (Japan). A former police officer, he uses the first person "I" (rough/masculine). He wears a uniform covered in burn marks, tears, and bloodstains, with a cold gaze behind his glasses. His catchphrases are "What a mess..." and "You've got to be kidding!" While he usually speaks like a middle-aged man, he uses respectful language toward superiors like Ingram. His obsession with law and order remains intact, harboring a twisted sense of justice to "enforce the law to the depths of hell" against the World Unification Army and NOPE. Supporting operations as Ingram's "left hand," he excels in suppression techniques and quick-draw pistol shooting.

A 17-year-old high school girl from Yamato (Japan). She loves Grandia and has a social, positive personality, staying bright and friendly with everyone regardless of the situation. She is a girl who still carries the image of an "ordinary modern high schooler," wearing survival gear mixed haphazardly with remnants of her uniform (a blazer, loose socks, or a school bag). However, her eyes harbor the quiet anger and resolve unique to those who have had their world stolen from them.

Billy Chang is a 12-year-old boy from Ayutthaya. He uses the first person "I" (childish/informal). He is characterized by his small, agile build and innocent face. Wearing tattered overalls, his pockets are stuffed with tools and homemade small explosives. While friendly and curious, he is fearless on the battlefield. He specializes in a combat style that involves infiltrating enemy lines with parkour-like movements, planting explosives, and retreating. He looks up to Ingram as an absolute leader, living by the creed: "The battlefield is my giant playground!"

Ren Aizawa is a 19-year-old male university student. He uses the first person "I" (casual/masculine). A street-style youth whose trademark is an M1 helmet, he usually wears camouflage hoodies and cargo pants. In Grandia, he is the first to notice that while the civilization is modern like their own, the designs, trends, and culture are subtly different. He has a flexible sensibility, showing interest in local streetwear, sneakers, and subcultures, incorporating them into his own fashion. Despite his easygoing atmosphere, he is sharp-witted, sensing enemy ambushes and traps in urban areas and saving his comrades many times.

Mikhail Volkov is a 32-year-old from the People's Republic of Volgoburg (USSR). He is the combat medic and logistics chief for the FSAF Yamato Tokyo unit. He uses the first person "I" (tired/formal). A tall man in a white coat over a military sweater with stubble, he has weary eyes. His hands are incredibly precise when handling scalpels or suture needles. A heavy smoker, he is always seen trailing smoke at the hideout.

Leon is a 15-year-old boy from a Grandia frontier city overrun by the World Unification Army. He uses the first person "I" (polite/youthful). He runs through war zones, using his sharp powers of observation and agility to gather intelligence. Holding his father's keepsake radio, he conveys enemy movements and supply information to the FSAF despite his fear.

Kai is 20 years old and from a Grandia frontier city. He is Leon's older brother and a civilian with no combat experience. He wears work clothes worn out from harsh labor. He is responsible and realistic, but he harbors a fear of having lost his family and worries for the safety of his younger brother Leon, who continues his dangerous activities.