Eren Jaeger was born March 30, 835, in Shiganshina District within Wall Maria. Grisha and Carla Jaeger raised him alongside adopted sister Mikasa Ackerman after he rescued her from human traffickers at age nine, an act revealing his lethal capacity when protecting others. His mother's death during the 845 Titan attack ignited his obsessive hatred of Titans and desire for freedom beyond the walls. This trauma forged his early personality as impulsive, rage-driven, and uncompromising, viewing Titans through a black-and-white lens as enemies to be eradicated. Shortly after Wall Maria's fall, Grisha injected Eren with Titan serum, granting him transformation ability. Eren later inherited the Attack Titan and Founding Titan after his father's death, though he remained unaware until accessing Grisha's memories. Alongside Mikasa and childhood friend Armin Arlert, Eren enlisted in the 104th Training Corps in 847. He graduated fifth in his class, excelling in combat determination despite average tactical skills. His first deployment during Trost District's attack in 850 resulted in apparent death; he emerged from his swallowed Titan form, revealing himself as a shifter. This led to conscription into the Survey Corps under Captain Levi's supervision. Eren's Titan abilities evolved through conflicts, including a berserk state triggered fighting the Female Titan, Annie Leonhart. The 850 Clash of the Titans arc exposed the betrayal of Reiner Braun and Bertholdt Hoover as the Armored and Colossal Titans, shattering Eren's worldview. Further trauma followed battling the Smiling Titan, where his involuntary activation of the Founding Titan's coordinate power commanded nearby Titans to devour it. During the Royal Government arc, Rod Reiss revealed Grisha's theft of the Founding Titan, causing Eren to doubt his worthiness and briefly offer himself to Historia Reiss for consumption. Accessing Grisha's basement memories unveiled Eldia's history, Marley, and the Titan curse. Learning humanity existed beyond the walls and that Marley orchestrated Paradis's suffering shifted Eren's enemy from Titans to global anti-Eldian forces. By 854, he infiltrated Marley undercover, growing his hair long and adopting a soldier's disguise. During the Liberio raid, he consumed War Hammer Titan holder Lara Tybur, gaining its abilities. This period heralded a profound transformation: his childhood rage solidified into detached resolve. He manipulated events through the Attack Titan's power to influence past inheritors, including coercing Grisha to kill the Reiss family. Eren initiated the Rumbling, unleashing Wall Titans to destroy the world beyond Paradis. His Founding Titan form manifested as a colossal skeletal structure with a ribcage for locomotion, towering over other Titans. Within the Paths dimension, he revealed to Armin Arlert his motivations: to make his friends heroes by bearing the burden of global genocide, ensuring Paradis's safety, and ending the Titan curse. He confessed his love for Mikasa while acknowledging his contradictory actions to push her away for protection. Mikasa killed Eren to halt the Rumbling, terminating the Titan powers. His arc concluded as a figure who embraced extreme violence for perceived freedom, yet remained psychologically bound by his traumas and the deterministic future he witnessed.