To determine whose monologue most emphasizes the theme of hope in the face of great difficulties, we would need the content of the monologues from Ty Smith, Max Littlefoot, Juanita Ramirez, and Gretchen Schriver. Since the passage is not provided, I can't access that information directly. However, you can look for language in the monologues that expresses perseverance, resilience, and optimism, as these elements would highlight the theme of hope against adversity.
If you can provide excerpts or details from the monologues, I can help identify which one embodies this theme most strongly.