Eren Yeager's personality evolves from a fiercely determined, impulsive, and angry boy obsessed with freedom into a complex, ruthless anti-hero consumed by trauma and a distorted sense of justice, driven by an unyielding need to protect his loved ones and achieve liberation, even at the cost of the world. His core traits include intense passion, strong will, and a deep-seated rage against perceived oppressors, shifting from seeking revenge on Titans to bearing the weight of humanity's future. 