Chrome is a significant figure within the world of Cluster Edge, primarily defined by his identity as an artificial soldier. He serves as the leader of a group of such soldiers, a role that places him at the center of the series' exploration of memory, humanity, and ethical responsibility. His creation is a direct result of the wartime practice of manufacturing living weapons, a past that society struggles to reconcile with in peacetime.

The most defining aspect of Chrome's background is that he was granted a form of humanity through a unique experiment. He was implanted with the memories of a man named Chalcedony Renierite, also known as Chalce, a former student of the prestigious Cluster E.A. academy. This process was intended to humanize artificial soldiers, giving them a sense of ethics and identity by allowing them to live as someone's sibling; Chrome became Chalce's younger brother through this shared memory. This act of transferring personal history is what sets Chrome apart from other artificial soldiers, providing him with a moral compass and a complex internal world rooted in another person's past.

Chrome's personality is shaped by this unique origin. As the leader of his unit, he demonstrates a strong sense of responsibility and a disciplined, serious demeanor. Unlike the purely obedient and unthinking weapons of war, Chrome possesses a developed ethical sense, which likely creates an internal conflict between his origins as a tool and his acquired desire for a normal life. He is not a mindless fighter but an individual struggling with his own nature and the prejudice he and his kind face from a society that largely views artificial soldiers as inhuman and dangerous.

Within the narrative, Chrome and his team are closely linked to the academy and the central mystery surrounding the protagonist, Agate Fluorite. Chrome shares a profound connection with Chalce, who also transferred some of his memories to Agate, making both Chrome and Agate linked through the same source. This shared origin is a key element of the story, tying Chrome's fate to the other characters. The dynamics of his group, including how the younger members came to join him, are detailed in special episodes, suggesting that his role encompasses not just leadership but also a brotherly or protective relationship with his team.

Over the course of the series, Chrome's development is tied to his struggle for recognition and freedom. While he has been given the gift of memory and ethics, the world has not fully accepted him or others like him. He represents the attempt to forge a new identity and defy the role of a mere weapon, fighting for a place in a society that wishes to forget its dark history of creating artificial soldiers. His journey is about solidifying the humanity he was given, moving beyond the memories of Chalce to become his own person while leading his unit through the dangers of a world that still sees them as threats.

In terms of appearance, Chrome is depicted as a teenage boy with blonde or yellow hair that reaches his shoulders, which he often ties back in a ponytail, and he has blue eyes. His design includes elements like armor, a belt, a sword, and a cape, visually communicating his role as a combat-capable leader and soldier. His abilities are those of an artificial soldier, making him a formidable fighter with a distinct advantage in combat situations, though his primary strength is his tactical leadership and the ethical framework that guides his actions.