Eren is main character of Attack on Titan who vows to kill every Titan after witness his mother's death.
Growing up, Eren was the only child of Carla and Grisha Jaegar. They lived together in the Shiganshina District, an outcrop of Wall Maria, until the Colossal and Armored Titans destroyed it in year 845. A year before that, in 844, Eren accompanied his father on a checkup to the home of the Ackerman family, where they found the residents murdered and their young daughter Mikasa missing.
Eren tracked down the kidnappers, who happened to be human traffickers, to a small cabin and managed to kill two of them. He was almost strangled by the third, but his inspirational words awoken in Mikasa the control and ability to fight that would later make her a perfect solider, and she killed the third. After that, Eren gave Mikasa the red scarf she’s always seen wearing, and his family adopted her.
Eren’s best (and only friend, besides Mikasa), was a boy his age named Armin. The two were very curious about the world outside the walls, despite that topic being declared taboo, and dreamed of one day venturing beyond Wall Maria. This curiosity led Eren to express his interest to join the Survey Corps.
Eren Yeager is created by Hajime Isayama who has no information regarding any inspiration used to create him.
He has no outstanding talents, but he's worked harder than anyone to improve his marks. And he is more motivated to attain his goal than anyone.
— Keith Shadis (Episode 4)
He has short, brown hair and green eyes. Five years after the Shiganshina District event, he has grown tall and lean.
He is a hard working man who refuses to give up and bent on killing the Titans to avenge his mother. When Jean and Thomas state negative things about them dying against the Titans, Eren speaks loudly and declares that he will kill all the Titans. His charismatic speech often motivates his comrades and raises their spirit.