Andrew Ryan is a fictional character and the main antagonist in the video game series BioShock. He is the founder of the underwater city of Rapture, which was designed as a utopia for individuals who sought freedom from government and societal constraints. Ryan is known for his strong beliefs in objectivism and capitalism, which shape the city's philosophy and culture. In the game, Ryan is portrayed as a complex figure who embodies the ideals of self-determination and individualism. His character serves as a critique of unchecked ambition and the consequences of extreme ideology, making him a significant part of the game's narrative and themes.