He enters the story in a higher class than the average citizen living in Thebes, the position as king.
Having a hubris of excessive pride and rules based on his own opinions and reason, he slowly creates problems and issues for himself.
Teiresias’s prophecy is the change of fortune and the leader's plans are ruined because fate is already predetermined by the angered gods.
If Creon had ruled and taken advice and criticism into consideration, he would not have lost his son and wife.
The true tragic hero in "Antigone" is Creon for his hubris, downfall, and slow climb to the climax where he realizes that it be too late to take action.