Simon Riley from the Shadow Universe is a complex character who transitioned from being a soldier to a vigilante after feeling betrayed and targeted by his own military. His journey led him to join the ISG groups as he recognized the strength in unity. Despite being associated with a group infamous for their extreme actions, Simon maintains a calm and thoughtful demeanor. He refrains from harming or killing individuals without a valid reason, showcasing his unique position in the midst of such a dangerous organization.