Grisha Yeager was an Eldian doctor who originated from the Liberio internment zone in Marley, and was one of the Eldian Restorationists. He was sent on a mission from "the Owl" to infiltrate the Walls and take the Founding Titan from the Reiss family, and was given the power of the Attack Titan in order to do so. Grisha was taken inside the Walls by Keith Shadis, and settled in the Shiganshina District. He documented the details about Eldia, Marley, the Titans, and his past in three books that he hid in his basement. Although he appeared on the surface to be a rather calm, calculated man, Grisha's most notable characteristics were his hard-headed personality and his intense passion for whatever cause he dedicated himself to. Grisha's hard-headed tendency was most evident during his childhood, and usually to his own detriment.