Indigo children are often described as having special spiritual or psychic abilities and a heightened sense of awareness. Their story involves claims of being different from the norm and having a unique purpose or mission in life.
Well, without having read the 'mlp the green sun fanfic' directly, it's hard to say for certain. However, in MLP, the sun is usually associated with Celestia. So perhaps this fanfic takes a creative turn and the green sun is an alternative or corrupted version of the regular sun. It could be about how the ponies deal with this new and strange green sun, and all the adventures and challenges that come with it.
I'm not sure specifically as you haven't provided more details about 'indigo top stories'. It could be about various things such as indigo - the color, indigo - a brand, or indigo in a cultural or historical context.
One indigo children story is about a child who always seemed to know things before they happened. In school, he would predict small events like a pop quiz or when a substitute teacher was coming. His classmates thought he was strange at first, but then they realized he was just different. Another story is of an indigo child who could communicate with animals in a way. She would sit in the garden and the birds would come really close to her as if they were having a conversation. These stories show the unique and often mysterious nature of indigo children.
Overall, 'A Mere Cypher' is a novel that combines mystery and drama. It keeps you guessing with its plot twists and develops characters that you can really connect with. There are layers of subplots that add depth to the story.