Who is the raisonneur for streetcar named desire?

In "A Streetcar Named Desire" by Tennessee Williams, the character who serves as the raisonneur is Mitch. He represents a more grounded perspective, contrasting with the complex and often chaotic nature of Blanche DuBois. Mitch's straightforwardness and moral values highlight the themes of reality versus illusion, as he initially offers Blanche hope before ultimately confronting her deceptions. Through his interactions with Blanche, he reflects the play's exploration of truth and the consequences of delusion.