Eren Yeager  

Eren has a special titan power called "The Coordinate," by which he can direct abnormal titans to attack elsewhere. Its unknown what at this time but it turns out, because of the injection, Eren can utilize the ability to transform into a titan himself (which explains how his limbs were able to regenerate) with side effects of a high fever and massive stamina drain. When Eren was a child, he saved Mikasa from being sold off when on a visit to her home with his father. Three men—killers of her parents—were in her house, and he killed two of them—one by slitting his throat and the other by charging at with a quickly assembled spear. Mikasa herself killed the third man after Eren urged her to fight whilst the man strangled Eren. After this, he gave Mikasa his scarf and Erens father took Mikasa into their family. When Eren was a child, he saved Mikasa from being sold off when a visit to her home with his father. Three men—killers of her parents—were in her house, and he killed two of them—one by slitting his throat and the other by charging at with a quickly assembled spear. Mikasa herself killed the third man after Eren urged her to fight whilst the man strangled Eren. After this, he gave Mikasa his scarf and Erens father took Mikasa into their family. Has a sister that was never put in the official release in the USA. Later, when the Colossal Titan broke through Wall Maria the debris from this attack scattered and hurtled towards his home. He could only watch on as his mother—trapped under the rubble of their house—was eaten by a titan. This event lit the fire of revenge within Eren that he would kill all titans and not live a life cowering in fear. After the fall of Shiganshina at an unknown time, Grisha Yeager injected Eren with the titan serum which turned him into a pure titan, Grisha then allowed Eren to eat him so that Eren could inherit the founding and attack titan. After the fall of Shiganshina at an unknown time, Grisha Yeager injected Eren with the titan serum which turned him into a pure titan, Grisha then allowed Eren to eat him so that Eren could inherit the Founding and Attack titan. 19 (after time skip) Later, when the Colossal Titan broke through Wall Maria the debris from this attack scattered and hurtled towards his home. He could only watch on as his mother—trapped under the rubble of their house—was eaten by a titan. This event lit the fire of revenge within Eren that he would kill every giant and not live a life cowering in fear.Sometime after this—before the time skip that jumped a few years ahead, to when he became a soldier—his father injected him with something. Later, when the Colossal Titan broke through Wall Maria the debris from this attack scattered and hurtled towards his home. He could only watch on as his mother—trapped under the rubble of their house—was eaten by a titan. This event lit the fire of revenge within Eren that he would kill every giant and not live a life cowering in fear. 19 (After Time Skip)