Duncanville positively portrays LGBTQ+ characters, primarily through Bex, a recurring lesbian character, and Mia, who is non-binary. Their identities are normalized and integrated into the ensemble without being a source of ridicule or conflict. The show's casual acceptance and dignified depiction contribute to an affirming overall impact.

Duncanville features Bex, a non-binary character, whose identity is presented respectfully and integrated into the narrative without prejudice. The show portrays Bex with dignity and agency, reflecting an affirming and positive stance towards transgender identities.

The show satirizes the commercialism and superficiality of a Christian rock band, portraying its adherents as somewhat naive and image-focused without offering significant counterbalancing positive portrayals of the faith.