Eren is hard headed, brash and above all else determined. Ever since he was a child he was devoted to joining the Survey Corps no matter what. He is full of rage and in his titan form it increases even more so.
Powers and Abilities
As a soldier, Eren has been trained in hand to hand combat and three dimensional Maneuvering Gear (used for fighting Titans). Due to his Titan Shifting abilities, he possesses an impressive healing factor that allows him to regrow severed limbs.
Eren also possesses the power of two of the nine legendary Titan Shifters, "The Assault Titan" and "The Original Titan". In his Titan form, he can lift boulders weighing several tons, harden his body, boasts an impressive healing factor and exhibits the power to control all Titans with the power of the Original Titan. However, to use the final ability, Eren has to Sync-up with a member of the Royal Family to do so.