A 'brave as a noun fanfic' is unique because it treats 'brave' not just as an adjective but as a noun. This could mean that the concept of 'brave' is personified or given a more tangible form within the story. For example, it could be a character named Brave, or 'brave' could be an entity that characters interact with.
I'm not sure specifically which 'brave as a noun fanfic' there are. You could try searching on fanfiction platforms like Archive of Our Own. They have a vast collection and you might be able to find something related by using those keywords in the search bar.
Sure, 'novel' is a noun. For example, you can say 'I'm reading a novel.' Here, 'novel' is the object of the verb 'read' and it clearly functions as a noun.
The term 'Danmei' usually refers to a type of literature originating from Japan, also known as fujoshi literature, which mainly describes love stories between men. This genre usually emphasized friendship, trust, and loyalty rather than pure love. The audience of the literature was mainly women, and some works had been translated into other languages.
I'm not sure specifically as 'fanfic' can cover a wide range of ideas. It could be a fan - made story related to something named 'brave' in 2017. Maybe it's about a brave character's adventures, or it could be a story set in a particular 'brave' universe like a movie or book world from 2017.