Reg’s origins are shrouded in mystery. With no memory of his life before meeting Riko, he has no knowledge of his creators or purpose. However, clues to his past emerge throughout the series. It is revealed that Reg may have been constructed by an unknown civilization in the Abyss and shares design similarities with Gaburoon, another Interference Unit, leading to speculation about a shared creator.

What little is known about Reg’s past comes from fragmented memories and interactions with other characters. Interestingly, Reg was referred to by the same name—”Reg”—before meeting Riko, suggesting a deeper connection between his identity and the Abyss.

Reg has the appearance of a young boy with dark brown skin, black hair, and large, expressive eyes. His body is clearly artificial, with metallic limbs and a segmented design that blends seamlessly with his humanoid features. His arms are equipped with retractable wires, and his body has glowing red markings that activate when he uses certain abilities.

Reg’s attire includes a helmet-like headpiece with animal-like ears, a scarf, and shorts, giving him a somewhat whimsical appearance. His design is both endearing and intriguing, reflecting his dual nature as a childlike companion and a sophisticated creation of unknown origin.

Reg is kind-hearted, empathetic, and deeply loyal, often putting Riko’s safety and well-being above his own. Despite his artificial body, Reg exhibits a wide range of emotions, from fear and sadness to joy and determination, making him one of the most relatable and human characters in the series.

Reg is also curious and courageous, willing to face the dangers of the Abyss to help Riko achieve her dream. However, his lack of memories and uncertainties about his purpose often leave him questioning his identity and place in the world.

Meeting Riko
Reg’s journey begins when Riko discovers him unconscious in the upper layers of the Abyss. After waking, Reg has no memory of who or what he is, but he quickly bonds with Riko, who gives him his name and convinces him to join her in exploring the Abyss.

Journey into the Abyss
As Riko’s protector and companion, Reg plays a vital role in their descent. His immunity to the Curse of the Abyss allows him to traverse layers that would otherwise be impossible for Riko, and his combat abilities help them fend off dangerous creatures. Along the way, Reg begins to uncover fragments of his past and his connection to the Abyss.

Revelations and Growth
Throughout the series, Reg’s abilities and origins are gradually revealed. His interactions with characters like Gaburoon suggest that he may be part of a network of Interference Units designed to monitor or interact with the Abyss. Reg’s journey is as much about discovering his own identity as it is about helping Riko find her mother.

• Riko
  Riko is Reg’s closest companion and the one who gives him his name. Their bond grows throughout the series, with Reg serving as both a protector and a friend.

• Gaburoon
  Gaburoon’s observations about Reg’s design and abilities hint at a shared origin, adding another layer of mystery to Reg’s past.

• Nanachi
  Reg forms a strong bond with Nanachi, another companion on their journey. Nanachi’s knowledge of the Abyss and its dangers helps Reg better understand his abilities and the challenges they face.