Rei

Rei is an AI Robot invented by Byakuya Ishigami and the protagonist of the Dr. STONE reboot: Byakuya spin-off series. Since Byakuya's departure, Rei has served as a guardian of earth, protecting it from various outside threats. Gradually wearing down and losing its resources, Rei waits to this day for Byakuya to return, triggering a light signal in hopes of Byakuya seeing it. Rei's brain (comprised at the start of the series by 60 smartphone motherboards because of underfunding) is filled with useful knowledge about astronomy, astronautics, and earth science (as well as a surprising dept...