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Eren is of average build and height, with shaggy brown hair and grey eyes. His hair is parted down the middle with some visible bangs, and typically he is seen wearing the uniform of the 104th Training Corps, and later the Survey Corps uniform with a loose, pale green sweater on that has a small corset tie at the neck. In his leisure time, Eren can be seen wearing this same sweater with dark green pants and light brown shoes.
Eren is very driven in his pursuit of killing Titans. The drive he feels for this goal has led him to join the 104th Training Corps and later the Survey Corps. Usually he is very quick to lose hold of his emotions and feels great anger, often fighting with other comrades such as Jean Kirstein.