Willy Loman in the Death of a Salesman is a tragic hero. His characteristics revealed him as a tragic hero.
Willy's flaw is he believes and teach his sons that the measure of a man’s success is how much wealth he has accumulated and that this wealth is gained by being well liked.
Willy is prideful. When he lost his job, Charley offer him a job but he refused the job. This is also one of his flaw.
We're finally free, Willy.
Willy's American Dream was being a salesman. A salesman that everyone would recognize. However, Willy's work ends up contradictory to his dream: His family is in debt, he is "not noticed.
Willy realizes that his dream of success has not materialized. His realization led him to commit suicide. He think that the only way to help his family is to leave them the insurance money that he has been saving for his entire life.
His death reveals the opposite. No one came to his funeral. His sons didn't feel thankful for his actions at all.