Travis's obsession with Iris is a pivotal element of the film, as it serves as a catalyst for his downward spiral into madness. Iris, played by Jodie Foster, is a complex and multifaceted character who embodies both vulnerability and resilience. Her relationship with Travis is multifaceted, representing both a desire for connection and a need for control. Through their interactions, Scorsese critiques the societal structures that enable exploitation and abuse, particularly of women and marginalized communities.