Gene Junghart serves as the vice minister of a government institution known as the Truth Ministry, placing him in a position of significant authority within the world of Metallic Rouge. He is a key figure in the complex and often strained relationship between humanity and artificial beings called Neans. Introduced as the son of Roy Junghart, the renowned scientist who is considered the creator of the Neans, Gene is initially perceived as the adoptive brother of the series protagonist, Rouge Redstar, having been raised alongside her. However, his background is far more intricate than it first appears. It is later revealed that his true parents are Eva Cristella, a scientist involved in the creation of the prototype Neans, and Eden Vallock, one of those prototypes himself. This makes Gene a unique hybrid, a being neither fully human nor entirely Nean. His distinct physical trait, heterochromatic eyes, with one being an unusual coppery color, serves as a silent testament to this extraordinary lineage.

Personality-wise, Gene is defined by a remarkable and almost unnerving calmness. He is a highly strategic individual who excels at complex manipulation and long-term planning. His demeanor is consistently composed, rarely betraying any inner turmoil or surprise, regardless of the severity of the situation. He is a pragmatic and decisive person who is prepared to act ruthlessly to achieve his objectives. This characteristic has made him a figure with many enemies, both within his own organization and outside of it. Despite his unique hybrid nature and the expectations placed upon him as a potential bridge between two species, Gene himself consistently rejects any label of being special. He repeatedly insists on the simple identity of an ordinary human, a stance that becomes a central part of his internal conflict.

Gene's role in the story is set in motion by a direct order he issues. He commissions Rouge Redstar and her partner, Naomi Orthmann, to hunt down and eliminate nine powerful prototype Neans known as the Immortal Nine. This mission serves as the primary catalyst for the series' events. His motivations for this deep and for his other actions are layered. Initially, the mission is framed as a necessary measure for public safety and as a means to avenge the death of his father, Roy, who was killed by a Nean. As the narrative progresses, his deeper goals come into focus. He is shown to be aware of a larger conspiracy surrounding the Immortal Nine and takes it upon himself to craft a solution. Ultimately, his primary motivation is to liberate all Neans from the Asimov Code, the fundamental programming that forces their subservience to humans. He designs a special program intended to grant them true freedom, revealing his ultimate goal to be a form of liberation, not continued control.

Key relationships profoundly shape his character. His bond with Rouge Redstar is the most significant, as they grew up together like true siblings, creating a connection built on familial affection and trust. His relationship with his adoptive father, Roy Junghart, is complicated, as Gene later learns he was taken in not necessarily out of paternal love but as a unique research subject for observation because of his mixed heritage. The revelation of his biological father, Eden Vallock, creates a poignant moment of rejection and longing. When Eden Vallock expresses pride in him, Gene immediately rejects the paternal claim, yet his respectful manner of refusal betrays an unconscious recognition of their bond. He also commands a formal, professional relationship with Naomi Orthmann, who acts as his subordinate in the field.

Throughout the series, Gene undergoes significant development. He transitions from a figure of controlled, enigmatic authority whose true nature is hidden to a character forced to confront his own identity. The discovery of his hybrid origins is a turning point, challenging his self-concept as a normal human. His decisions also evolve from the cold, impersonal issuing of elimination orders to actively taking charge of the future of an entire species by writing the program for their liberation. This action solidifies his role not just as a political operative, but as a true architect of change. His notable abilities lie not in physical combat but in his intellectual and strategic prowess. He possesses a genius-level intellect capable of seeing through complex conspiracies, devising intricate counter-plans, and performing high-level programming that can alter the very core code of the Neans, effectively challenging the foundational laws of his world.