Sebastian Castellanos is a fictional character and the main protagonist of the video game series The Evil Within, created by Shinji Mikami. He is a former detective with the Krimson City Police Department who becomes embroiled in a nightmarish world filled with horror and supernatural elements. Throughout the series, Sebastian battles various monsters and uncovers dark secrets while trying to save his daughter. In the games, Sebastian is characterized by his troubled past and determination to confront his fears. His journey often involves navigating through twisted environments and facing psychological challenges. The character's development is central to the narrative, making him a compelling figure in the survival horror genre.