This is so exciting!
Thanks for starting the thread!
I suppose my initial thoughts went to the light and dark theme of the show. Tandy's white glowing dagger and Tyrone with his dark cloak. So then I think...shades of grey maybe for a color scheme? Maybe?
As for the banner. Obviously Cloak and Dagger should be on it
So Tandy and Tyrone. They are the only two that are part of every single episode. Beyond them I'm not sure. Brigid? Mina? Should we include their families?