Reg is a central character in the anime series 'Made in Abyss'. He is a mysterious humanoid robot with retractable arms and a helmet that conceals much of his face. Reg is discovered by Riko, the series' protagonist, at the edge of the Abyss. He possesses incredible strength and durability, along with a powerful energy beam known as the 'Incinerator'. Despite his mechanical nature, Reg exhibits a range of human emotions and is determined to uncover the truth about his origins while protecting Riko on their perilous journey into the Abyss.