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Willem Dafoe portrayed Ansel Elgort's on-screen father in "The Fault in Our Stars." Dafoe, a seasoned actor known for his versatility, brought depth and emotional weight to the role of Gus's father. His performance added layers of complexity to the father-son relationship, capturing the love, support, and challenges they faced throughout the story. Dafoe's portrayal resonated with audiences, enhancing the film's emotional impact and overall narrative.