In the books, Demetri is described as having an olive complexion with a chalky pallor, and black hair that reaches his shoulders. He is described as tall and lean. His eyes are burgundy in color due to his diet on human blood.
Bella also describes Demetri in Breaking Dawn as being hard and lean as the blade of a sword remembering what he looked like the last time she met him in New Moon.
Not very talkative, he is reasonable, very polite, even formal. He is very elegant and charming. It appears that he and Felix share a close friendship. Demetri is also very loyal to the Volturi and enjoys working under them.
Demetri's gift is sensory location; he catches the "tenor" of a person's thoughts, and uses it to follow his targets until he finds them. It is believed that he would not be able to track Bella, since she is protected from mental abilities. However, it is still said in New Moon that his powers are far more powerful than James', because he can track people from all across the world, while James needed to be relatively close to the victim. He is considered the greatest tracker in the world, and that is why Aro recruited him, because he does not surround himself with second-bests.

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