Booker DeWitt is the main protagonist in the video game series BioShock Infinite. He is a former Pinkerton agent with a troubled past, seeking redemption by rescuing a mysterious girl named Elizabeth from the floating city of Columbia. Throughout the game, Booker grapples with his history and the consequences of his actions. As the story unfolds, Booker discovers that he has a unique connection to Elizabeth and the multiverse, leading to complex themes of choice and fate. His character is marked by a struggle for identity and the quest for forgiveness, making him a compelling figure in the narrative.