Pat Solitano is the main character in the novel and film titled "Silver Linings Playbook." He is a man in his thirties who struggles with bipolar disorder after experiencing a series of personal setbacks, including a divorce. Pat is determined to regain control of his life and reconnect with his estranged wife, Nikki. Throughout the story, Pat's journey involves therapy, self-improvement, and forming new relationships, particularly with Tiffany, a woman dealing with her own challenges. His character embodies themes of resilience, hope, and the importance of support systems in overcoming mental health issues.