Eren Yeager was a former member of the Survey Corps and the main protagonist of Attack on Titan. Driven by his past, he vowed to protect his home and exterminate the Titans. He joined the 104th Training Corps with Mikasa and Armin, later discovering the truth about the world's history. This led him to fight for freedom against humanity's enemies. He possessed the power of three Titans: Attack, Founding, and War Hammer.