Reg

Reg (レグ, Regu) is the deuteragonist of Made in Abyss. He is a robotic being with the appearance of a young boy; his true origins are unknown, as he cannot recall anything about his life before being awoken by Riko. She names him after a dog she once owned, "Reg," but it is later revealed he went by the same name prior to ever meeting Riko. He voluntarily joins Riko on her descent through The Abyss in search of answers to his unknown past.