Well, Flash is often associated with saving the day and protecting the city. Black Flash, on the other hand, appears when a speedster's time is up and is a more ominous presence. Also, their appearances and costumes are distinct.
Black cumin can be used to add a unique flavor to various dishes. It is often used in spice blends for curries, where it gives a warm and earthy note. It can also be sprinkled on top of bread before baking to enhance the flavor.
Maki in fanfiction usually has a fierce loyalty to her friends, especially Yuta. She is the type to fight for what she believes in. Yuta is sometimes portrayed as being a bit naive in the ways of the world outside his own small circle, but his pure heart makes him endearing. In many stories, their different personalities create an interesting dynamic, like in a story where Maki's boldness gets them into a risky situation and Yuta's calm thinking gets them out.