Eren Yeager was a former member of the Survey Corps. He was the main protagonist of Attack on Titan. He lived in Shiganshina District with his parents until the fall of Wall Maria, where he impotently witnessed his mother being eaten by a Titan. This event would lead to Eren's intense hatred towards the Titans as he swore to wipe all of them off the face of the Earth. Soon afterward, his father, Grisha Yeager, found him and gave him the key to his basement, instructing Eren to find it at all costs and retake Wall Maria. He then injected Eren with a Titan serum. In the year 847, Eren, Mikasa Ackerman, and Armin Arlert joined the 104th Training Corps. The three graduated with Eren ranking 5th best, and they joined the Survey Corps following the battle of Trost District. After finding the basement and unlocking his father's memories, Eren learned about the truth of what the Titans are, as well as the history of Eldia and Marley. Eren then vowed to free his home from their true enemy: the rest of humanity that lives across the ocean. Eren possessed the power of three Titans. From his father, Eren inherited the Attack and Founding Titans. After eating the younger sister of Willy Tybur during the Raid on Liberio, he gained the War Hammer Titan as well. Eren was a young man of average height and muscular build. His facial features strongly resembled his mother's; he had a reasonably long, rounded face and sizable, expressive, gray eyes. His hair was short and black, and his bangs fell in a natural, middle-parted, curtain-type style. After his training and during his time as a soldier, he became very physically fit and muscular, although this was often unseen due to his relatively baggy clothing. After the four-year time skip, Eren grew his hair down to his neck. Eren was first seen wearing typical townsfolk attire that consisted of brown trousers, a green shirt with string tassels at the collar, a reddish-brown coat, and simple brown shoes. A few years before the fall of Wall Maria, he also wore a black scarf, which he gave to Mikasa Ackerman the day they met. As a teenager, he was often seen in the typical Survey Corps uniform while training. His casual attire consisted of a long beige shirt identical to the one he wore in his first appearance, a maroon sash around his waist, white trousers, and brown knee-high boots. He always kept the key given to him by his father dangling around his neck on a string. By the time Eren infiltrates Marley in the year 854, Eren had grown visibly taller, and his hair has grown down to shoulder length. He had a slight mustache and goatee, as well as bandages that cover his forehead and left eye. To maintain his cover, he wore the Eldian armband around his left arm, though he had initially worn the armband around his right arm before it got corrected by Falco Grice. After returning to Paradis Island, Eren discarded his Survey Corps attire and began wearing a white shirt with dark pants underneath a simple black mantle. He tied his hair back into a bun and shaved off his mustache and goatee. Eren was best described as hardheaded, strong-willed, passionate, and impulsive, which are attributes of both his strong determination to protect mankind and, eventually, his equally strong determination to escape the Walls. Even as a young child, he was so intent on joining the Survey Corps that he argued with and shouted at his mother, referring to the people in the village as "silly" and comparing them to complacent livestock. Eren cared deeply for his friends and family, risking harm and even death in order to protect them. As a child, he took on larger boys who bullied Armin Arlert and, more tragically, he attempted to lift the rubble that crushed his mother during the Titans' assault in Shiganshina. Eren was also capable of displaying violent behavior in defense of people he did not even know. This was highlighted when he attempted to rescue Mikasa Ackerman by brutally slaughtering two of the human traffickers who had captured her. After Armin showed Eren a book depicting the wonders of the outside world, he grew to share his friend's curiosity of the world beyond the Walls and decided to see it for himself. This led Eren to develop a scornful attitude towards anyone who was content to live and die within the Walls' confines without ever setting foot outside. As a result of this, he greatly admired the soldiers of the Survey Corps, regarding them as "heroes" and wishing to join their ranks as soon as he became eligible for enrollment. He was quick to take offense when anyone spoke badly of the Corps, and his determination to join them caused friction between himself, his mother, and to a lesser extent, Mikasa. Eren has a marked lack of self-restraint that often led him into trouble, causing his friends and family to worry about him. His limited self-control was evident in his temper, which often caused him to act recklessly in anger, or say things he himself knew he should not have. This was exacerbated by his tendency to view the world in terms of black and white, where individuals who deny others their freedom were worthless scum, unfit to be left alive. Though he had great compassion, Eren had little in the way of empathy and was prone to taking things at face value, evaluating situations or ideas solely by his own arbitrary perspective and rarely ever thought deeper about them unless someone else pointed things out for him. Though Eren spoke about eradicating the Titans with seemingly great confidence, his bravado hid deep insecurities. He was often ready to blame himself and his incompetence whenever something went wrong, believing a course of action he took - or failed to take - was the reason for the disastrous results. This was most evident when he blamed himself for the death of the Special Operations Squad at the hands of the Female Titan, and for the deaths of the many veterans that perished in the rescue operation after he had been kidnapped by Reiner Braun and Bertolt Hoover. Eren's ordeals since the coup d'état have mellowed his personality considerably. When he discovered the truth about where his father had been the night Wall Maria fell, he was willing to ask Historia Reiss to eat him for the good of humanity. He admitted that he viewed himself as weak, and that his reliance on the Attack Titan proved it. It took a lot of encouragement from his friends for him to overcome this state of despair and regain his passion. By the time he found out from his father's books that Titans were actually humans who were forced to transform by the Marleyan Government, he seemed to have let go of his hatred against them. When passing by a slow-moving Titan en route to the ocean, he showed no signs of anger or unrest, and instead calmly called the Titan an "Eldian." Eren possesses great amounts of perseverance, fortitude, and determination. As such, he managed to master the basics of vertical maneuvering equipment, even when his equipment was damaged, and graduate as fifth top trainee in his class despite his lack of natural talent. Eren had been noted to be quite charismatic and had a talent for delivering impassioned speeches, often unwittingly managing to persuade the mass of his listeners to sympathize with his point of view. Even Jean Kirstein, his bitter rival, had admitted this, as he convinced over half a dozen recruits to consider joining the Survey Corps before the Battle of Trost. Four years later, he made use of this skill consciously, as shown when he easily lifted Falco's spirits and convinced him to deliver a letter outside of Liberio, despite the fact that Eldians were usually forbidden from leaving the internment zone. In the years since the recovery of Shiganshina, Eren had shown remarkable progress in his analytical and tactical skills, both in and outside of battle. Apart from maintaining his cover as a Marleyan soldier for an extended period of time and procuring a method of transporting his letters to the Survey Corps, Eren accurately guessed the source of Falco Grice's injuries and the reason why he wanted to become the next Armored Titan. Later on, he successfully led Reiner into a trap, and in his battle against the younger sister of Willy, he quickly deduced the true location of the War Hammer Titan. When he was unable to crack the crystal encasing her with his Attack Titan's jaws, he was resourceful enough to use the Jaw Titan's jaws as an improvised nutcracker to kill her and obtain the War Hammer Titan. Eren was aided in this by his unnervingly stoic and calm demeanor he developed since infiltrating Marley, never losing his composure and usually wearing a blank expression on his face, no matter how dire or stressful the situation may be. Although he admitted to becoming angry when Koslow traumatized Eldian soldiers, he remained outwardly unfazed during the incident. Additionally, he appeared to have become less proud overall, thanking Mikasa for helping him, which he normally used to dislike and criticize her for. His infiltration of Marley had given him a change in perspective regarding his enemies. After spending time as a Marleyan soldier, he came to understand that his enemies were people no different from his own. Because of this, he deeply empathized with Reiner and the other Warriors who were sent to Paradis Island, letting go of his desire to kill them in revenge for attacking his home and stating that they were simply victims. Nevertheless, he still prioritized his personal mission of destroying Paradis' enemies for the sake of his people's freedom, regardless of how many lives were lost on either side. Furthermore, this personal mission had driven him enough that he unleashed all of the Wall Titans and declared he will trample the entire world to exterminate all life outside of the island. Eren believed that righteous goals sometimes require unethical means. He was ready and willing to use such methods himself when he declared war against Marley. Eren abused the twelve-year-old Falco's trust, fully aware of his family's precarious situation, and eventually killed dozens of innocent Eldian civilians (including children) as collateral damage in a surprise attack on Willy Tybur. In spite of this, he seemed to have developed a dislike for war, referring to it as "hell." He believed that, with good reason, no one would want to go to war if they knew the suffering it would put them through. Eren's time-serving in the Marley Mid-East War also seemed to have had an effect on his psyche to some extent. While he had shown great sorrow for comrades who have died on expeditions, and had demonstrated a great amount of compassion for his fellow graduates from the 104th, he laughed upon hearing that Sasha Blouse's final words were "meat;" although he changed his reaction and was seen about to cry after Jean Kirstein accused him of being responsible for her death and remembered Sasha's conviction that they would have more sheep and cows after recovering Wall Maria. It was later revealed that Eren knew the future via the Attack Titan's ability and had been spiraling down a state of depression, knowing what the inevitable outcome of the present would be. While he did wish for a peaceful solution, he understood the impossibility of it better than all around him, even Armin. After initiating the Rumbling, Eren had intended for the world to see the Eldians who stopped him as heroes. However, he was still unsure if his friends could have really stopped him, noting he would have completed the Rumbling if they did not. Eren could not pinpoint the reason he wanted to wipe out the world, recalling Grisha telling him "you are free" the day he was born. In a rare display of emotions since years, Eren broke down to Armin at the thought of Mikasa finding someone else after his death, and revealed his true feelings about her, causing Armin to pity him. Eren desired to be with Mikasa and everyone else, but knew he could not be forgiven for his actions after wiping out 80% of the world's population.