I just saw a picture of Nemu and remembered that a long time ago (really long, like a lifetime ago) I had started writing an Ichiruki fic, didn't remember the plot, only that featured her and Hisagi as a secondary couple because I really liked Nemu and wanted to include her, and
These are revealed in the very language and structure of the work, and how the author wants us to feel about the characters and the world they inhabit. Eventually all of these aspects can coalesce into a clear picture about the themes of a given work.