Logan Thibault is a fictional character from the novel "The Lucky One," written by Nicholas Sparks. He is a U.S. Marine who finds a photograph of a woman while serving in Iraq, which he believes brings him good luck. After returning home, he embarks on a journey to find the woman in the photo, named Elizabeth. Throughout the story, Logan struggles with the emotional scars of war and seeks to build a new life. His quest for love and redemption leads him to confront his past and the challenges of forming a relationship with Elizabeth, who has her own struggles to overcome.