The Dark Flash is Walter West of an alternate timeline. His life paralleled that of Wally West until a battle with the villain Kobra cost Linda Park's life. Walter was not able to save his Linda unlike Wally. Driven mad with grief at her loss, Walter embarked on a life of brutal enforcement against criminals crippling many until he encounters Wally and his Linda. Believing them dead, he traveled to their timeline to take Wally's place.
You don't want to cross John Wick aka Baba Yaga. He's not the boogieman, he's the one you send to kill the boogieman. This design harkens back to the nightclub scene from the first movie. Wear it with pride and no one will steal your car or kill your dog.