As a huge Hollow Knight fan, Silksong being announced has completely brought me back into my obsession. Especially I have an obsession with the pre-fall history of Hallownest, and all the drama that is there in. I want to write that (with all personal head-cannons and added bits) and especially focus on the characters of the time (with a tiny bit of added personal writing for the fun, by that meaning adding a very imperfect vessel for the 5 knights to adopt)
This would focus on them, the royal court, drama with the pale king and the white lady, and all leading up to the fall. Writing a story that everyone will know the end of, but we rarely understand the beginning.
Things I really wanna focus on
Isma and Ogrim's relationship
Ze'mer and the traitor lords daughters relationship
Dryya and her secret love for the white lady
The white lady's guilt over the vessels
The pale kings deal with Hera
Hornet's early life (the three queens thing might not be canon but I don't know that yet)
The early life of the Hollow Knight
And much more on the path to the decay of Hallownest.