What literart device does Harper Lee use to characterize the ewells in to kill a MOCKINGBIrd?

Harper Lee uses the literary device of irony to characterize the Ewells in "To Kill a Mockingbird." The Ewells portray themselves as superior to others in the community, yet they are shown to be the most impoverished and morally corrupt family. This creates a stark contrast that emphasizes the hypocrisy and ignorance of their behavior.