Hi, I'm kinda for fun putting together what would basically be a guide to the Wizarding world for muggleborns. It would be a "book" discussing the government structure, wizarding culture, the economy, but also societal norms, and culture/etiquette of other magical societies such as Goblins and Centaurs. However I am doing this in the context of a fanfic and want to expand on what is canon using fanon. However I would appreciate some ideas from people. I'm looking for the kind of fanon worldbuilding that tends to show up in fanfics. For example:
Family Magicks
Wizarding Lordships and Wizengamot stuff
Gringotts not only being a bank but also being the ones who handle family/inheritance/lordship/Family Magicks records and legal documents. As well as Goblin Culture.
Wizarding Specific etiquette
Pagan holidays
Creature Inheritance type stuff (I'm doing this as a complementary thing for a fic I'm writing that has creature inheritances) and any creatures you'd like to see listed in this creature inheritance guide and anything you can think of about the creature
The Mechanics of Magic
Wizarding Values
Fanon info on specific characters
House-elf lore
Those are a few examples but any Fanon worldbuilding stuff you can think of and want to share, I plan to upload this guide on AO3 and Wattpad when it's finished