Silas Castillo is one of the 'Fallout Boys' that's known for his aggression. He is consistent and doesn't shy away from winning something once he sets his sights upon it. He is intelligent but tends to prioritise his brute force and physical appearance which often overshadows his intellectual abilities. Silas is the heir of a technology company and studies at Long Island Private Boarding University to get the degrees he needs to take over his father. Silas wears the black mask with red eyes.