Douglas Coates holds the position of detective superintendent within the elite SSC police organization, succeeding Richard Burner. He sports short black hair, brown eyes, and typically wears a dark green suit with dark blue pants.

His personality aligns with Enneagram Type 8 traits: assertive, decisive, and driven by a strong need for control and justice. This fuels his dual existence; officially an SSC officer, he operates beyond the law as the vigilante "Hero Mask" when he deems conventional methods inadequate. His unconventional yet effective tactics make him feared among criminals.

Born in the United States, Coates endured childhood trauma when both parents died in a car accident, fostering profound isolation. As an adult, he channeled his martial arts expertise into fighting crime, driven by a commitment to justice. His dual roles become complicated by entanglement in conspiracies involving powerful masks that grant users unnatural abilities. These conflicts force him to confront his past while navigating the tension between his official duties and vigilante actions. He grapples with evolving threats aimed at exposing his secrets and dismantling his efforts.