Geji

Geji (ゲジ, Geji) is a young man who adopted Ashidaka and raised him.

Plot
SPOILER: THE FOLLOWING CONTENT CONTAINS SPOILERS.

Ashidaka and Geji were hunting for parts of droids. Ashidaka wasn't really good at hunting, but was extremely fast at taking the droids apart. After the hunting, he went in the city, even though Geji was against it. He was listening to a man preaching how humans with more than a pair of metal arms are the devil's family and need to be killed. He eventually found his mother, but seeing she had another child, he left without saying anything. He then bumped into a man, after which he was mistaken as a pickpocket by the Mantis Security Force, all of whom after seeing he had 4 metal arms, tried to kill him.

He managed to get back alive to Geji, but with broken arms, so they went hunting to get parts to repair them. On their way, they got attacked by crazy, "red-eyed" droids. Geji initially dominated them, but eventually lost as his arms overheated from repeatedly attacking a large number of droids. He offered to shield Ashidaka from the droids, planning to sacrifice himself to protect the boy. As Geji revealed, Ashidaka was found when his mother was about to abandon him on Geji's hunting ground, for having 2 pairs of arms. His mother initially stated that she would like to die together with her son since "this child has done nothing wrong". However, as the young Ashidaka started to smile, Geji couldn't bring himself to do the deeds. After hearing the full story, Ashidaka decided to fight and repaired himself using the droids and fought back. Using the parts he dismantled, he also repaired Geji's arms. Suddenly, more droids appeared, but ignored the duo and went in to the metal mountain. Moments later, the mountain erupted and a 100 pair metal arms demon appeared as in the Bible stated.