Kofuku and Daikoku are often characters in certain fictional universes. Kofuku might be a carefree and somewhat chaotic character, while Daikoku could be more stable and reliable. In a fanfic, they can be developed in various ways depending on the author's vision.
Sure, the Noragami manga is completed. It was a great ride with an ending that wrapped up the plot nicely. If you haven't read it yet, it's worth giving a go.
One common theme is friendship. Since they are friends in the original Noragami story, fanfictions often expand on their bond, showing how they are there for each other through thick and thin.
One common theme could be friendship. Given their relationship in the original source, fanfiction might explore how their friendship deepens or overcomes challenges.
Growth is also a theme. Fanfics may depict how their relationship helps them grow as individuals. Yato might become more open and less cynical because of Kofuku, and Kofuku could also gain more depth and understanding of the world around her through her connection with Yato. It's fascinating to see how their relationship can be a catalyst for personal development in these stories.