Why Night King? Because insomnia writes his novels. Not the greatest muse to have, but it works for him. His stories come from dreams born of his time in the Marines. During World War I, Marines fought so ferociously against the Germans that they coined them as Devil-Dogs. As for the series name? Scarlet and gold being the Marine Corps colors.
First, there was high school, then the Marines, then college. Since college, E.J. worked to write his first-in-a-series debut novel. As a Marine 'Devil', he was privy to information about cases pending within the Uniform Code of Military Justice. He's used this knowledge to inform the plot of his novel and the motivations of his characters.
In his photo, for all intents and purposes, he didn't intend for such a dark and menacing expression, lol. He was only going for a straight face, but take it as you will.
Writing that's worth a damn and earns your time to read. For any legacy, that's good enough for me.
Chew it up and savor it. Dream about it until the next early sunlit.