Eren’s father, Grisha Yeager, played a significant role in the story of Attack on Titan. He was a doctor who lived within the walls of Paradis Island, where humanity sought refuge from the Titans. Grisha had a deep desire to uncover the truth behind the Titans and their origins.
Grisha’s fate took a dramatic turn when he encountered a group of rebels known as the Restorationists. This group aimed to overthrow the oppressive government and restore the Eldians’ freedom. Their leader, Eren’s half-sister, Historia Reiss, was vital in their plans.
In his quest for knowledge, Grisha discovered an underground cavern, where he encountered Eren’s future self, who possessed the power of the Attack Titan. This future version of Eren urged Grisha to inherit the Attack Titan and save humanity from a devastating fate.
Driven by his desire to protect his loved ones and fight for freedom, Grisha agreed to Eren’s plea. He injected himself with a Titan serum, transforming into a mindless Titan. In that form, he devoured Eren’s previous Titan-shifter, the Smiling Titan, who had killed Eren’s mother, Carla Yeager.
Once Grisha consumed the Smiling Titan, he regained his human form and obtained the power of the Attack Titan. This act of consuming another Titan-shifter is known as “eating” within the series and is a way for one Titan to inherit the powers of another.
With his newfound abilities, Grisha embarked on a mission to retrieve the Founding Titan, which was in the possession of the royal Reiss family. In a tragic turn of events, Grisha located the Reiss family’s underground chapel, where he encountered Frieda Reiss, the true wielder of the Founding Titan’s power.
During their battle, Grisha was overwhelmed by Frieda’s abilities and was on the verge of defeat. However, driven by his determination to save his family and humanity, he unleashed his full power as the Attack Titan, overpowering Frieda and devouring her, thus stealing the Founding Titan’s power.
Grisha’s actions were not solely driven by personal gain but rather by his desire to protect his loved ones and ensure a brighter future for humanity. His decision to consume the Founding Titan’s power was motivated by his understanding of the immense responsibility that came with it.
Despite his intentions, Grisha’s journey came to a tragic end. His life was cut short when he was eventually devoured by his own son, Eren, who had inherited both the Attack Titan and the Founding Titan’s powers from his father. This event occurred years later, as part of Eren’s plan to bring about change and freedom for Eldians.
Eren’s father, Grisha Yeager, played a crucial role in the story of Attack on Titan. He injected himself with a Titan serum, transforming into a Titan and devouring the Smiling Titan to gain the power of the Attack Titan. Grisha then defeated Frieda Reiss, the wielder of the Founding Titan, and consumed her to obtain that power as well. However, his life was ultimately cut short when his son, Eren, consumed him, inheriting both Titan powers.