Sebastian Castellanos is the primary protagonist of The Evil Within and The Evil Within 2.
Sebastian Castellanos is one of three primary characters in The Evil Within. Partners with Joseph Oda and Julie Kidman, the trio are sent to Beacon Mental Hospital to investigate a crime scene.
Upon finding the crime scene and responding cop cars deserted, they set out to find the secret evils of Beacon Mental Hospital. Shortly after the trio arrive, Sebastian witnesses the death of three police officers at the hands of Ruvik, who suddenly appears right behind Sebastian, knocking him out and transporting him into his dark, twisted world.
His daughter, Lily Castellanos, is a primary plot point of The Evil Within 2.
Sebastian is a highly trained police officer, which translates well to his abilities. In addition to his various weapons, Sebastian has several abilities that allow him to increase his durability, speed, health, etc.