A tragic hero is the protagonist of a tragedy in drama. In his Poetics, Aristotle records the descriptions of the tragic hero to the playwright and strictly defines the place that the tragic hero must play and the kind of man he must be. Aristotle based his observations off of previous dramas. Many of the most famous instances of tragic heroes appear in Greek literature, most notably the works of Sophocles and Euripides.
Aristotle shared his view of what makes a tragic hero in his Poetics. Aristotle suggests that a hero of a tragedy must evoke in the audience a sense of pity or fear, saying, “the change of fortune presented must not be the spectacle of a virtuous man brought from prosperity to adversity." In other words, the focus of the tragic hero should not be in the loss of his prosperity. He establishes the concept that the emotion of pity stems not from a person becoming better but when a person receives undeserved misfortune - and fear comes when the misfortune befalls a man like us. This is why Aristotle points out the simple fact that, “The change of fortune should be not from bad to good, but, reversely, from good to bad.” According to Aristotle a tragic hero is thought to be a man whose misfortune comes to him, "not through vice or depravity but by some error of judgment." In Sophocles' Oedipus the King, for example, the title character kills a man without knowing that the man in question is his father, then marries his mother out of ignorance.
Creon of Sophocles' Antigone is another notable example of a tragic hero. Polyneices and his brother, Eteocles, were kings, and the former wanted more power, so he left and assembled an army from a neighboring city. They attacked and the two brothers killed each other. Through Creon's law forbidding the burial of Polyneices, Creon dooms his own family. Other examples provided by Aristotle include Thyestes.
Therefore, the Aristotelian hero is characterized as virtuous but not "eminently good," which suggests a noble or important personage who is upstanding and morally inclined while nonetheless subject to human error. Aristotle's tragic heroes are flawed individuals who commit, without evil intent, great wrongs or injuries that ultimately lead to their misfortune, often followed by tragic realization of the true nature of events that led to this destiny. This means the hero still must be - to some degree - morally grounded. The usual irony in Greek tragedy is that the hero is both extraordinarily capable and highly moral (in the Greek honor-culture sense of being duty-bound to moral expectations), and it is these exact, highly-admirable qualities that lead the hero into tragic circumstances. The tragic hero is snared by his or her own greatness: extraordinary competence, a righteous passion for duty, and (often) the arrogance associated with greatness (hubris).