Aaron:

Often referred to as the Moor, he is a dark -skinned adventurer and mercenary soldier who fought with the Goths against Rome. He is Tamora's lover, and one of the captives Titus leads into Rome in Li. Aaron is also the chief villain of the play. As a dramatic character, he has a richly complex and ambiguous appeal.

On the one hand, he is the embodiment of evil. At II.iii.39, he tells Tamora, "Blood and revenge are hammering in my head." Yet we are not shown or told of any specific injury or injustice that he has suffered from the Andronici—except, in the course of war, to be defeated and captured. He seems inclined to villainy by his very nature: he is evil, and he does evil. He shows no pity or remorse. He proudly acknowledges that he has done "a thousand dreadful things" and regrets...